Router 30005000 Series

Router 3000/5000 Series Release Notes for V1.20 http://www.3com.com/ Part No. 10014296 Published January 2004 3Com Router Release Notes for V1.20 Introduction 1.1. Scope These release notes summarize operational requirements and issues for the following Router 3000 and Router 5000 hardware and software release V1.20: Router 3015 Router 5009 smart interface card (SIC): 2-Port ISDN BRI U Router 5231, 5640, and 5680 multifunctional interface cards (MIMs): 4-Port Enhanced Synchronous/Asynchronous MIM with X.21 4-Port E1/CE1/PRI MIM 1-Port T3 MIM 1-Port E3 MIM Read these release notes before installing your router, software, or component hardware. 1.2. Cable Connections 3Com recommends that you power off the router before connecting any cable. Do not connect and disconnect synchronous or asynchronous physical WAN cables, console cables, Ethernet cables, ISDN BRI cables, and 4-port physical WAN adapters while power to the router is on. Connecting cables while the router is powered on can crash the router or damage the interface port. 1.3. Online Resources 3Com routers contain a software agent that can be upgraded using the command line interface. The software agent that is initially provided with the routers does not fully support GRE, L2TP, SSH, IPSec, or SNMPv3. To download a software agent that adds full support for these features, visit the 3Com support website at http://support.3com.com to register your product. Note that this download agent contains encryption capabilities that are restricted to certain users and countries so approval for these downloads can take up to 48 hours. To upgrade to future software agents that contain additional features, you must purchase a service contract. Details are provided on the Service and Warranty pages of the 3Com support website http://support.3com.com . See the Router 3000 Installation Guide or Router 5000 Installation Guide for software download instructions. Download the Router 3000 Installation Guide from: http://support.3com.com/infodeli/tools/routers/R3000Install.pdf Download the Router 5000 Installation Guide from: http://support.3com.com/infodeli/tools/routers/5000Install.pdf Download the 3Com Router Command Reference Guide from: 2 3Com Router Release Notes for V1.20 http://support.3com.com/infodeli/tools/routers/3ComRouterComRef.pdf Download the 3Com Router Configuration Guide from: http://support.3com.com/infodeli/tools/routers/3com_configuration_guide.pdf Download other current software updates and release notes from: http://www.3com.com/ 3 3Com Router Release Notes for V1.20 1.1. V1.20 Release Notes This chapter offers updates on Router 3000 and Router 5000 features in the following areas: System Access SNMP System Management Interface Management Link Layer Protocol 1.1.1. System Access Symptom Solution Network Protocol Routing Protocol Multicast Protocol Security VPN QoS Dial-Up Documentation Resolved Issues The following commands will not be available after an upgrade from V1.10: undo login pad terminal telnet refuse-negotiation terminal telnet break-on-ip 1.1.2. SNMP Symptom Those commands are now undo loginmethod authentication-mode pad, reversetelnet no-negotiation, and reverse-telnet break-on-ip, respectively Solution Routers are not recognized by Network Management applications, such as 3Com Network Supervisor, unless SNMP V1 is enabled. Adding a row to the RMON2 trapDest table does not automatically enable traps. In the RMON2 trapDest table, the RowStatus value of CreateAndGo(4) is not correctly implemented. SNMPv3 traps are not being generated. Enable SNMP V1 on the device, as described in the Installation Guide, then discover the network using 3Com Network Supervisor. Use the snmp-agent trap enable command. Use CreateAndWait(5) and set the row Valid(1) using a second PDU. SNMPv3 traps are not supported in this release. 4 3Com Router Release Notes for V1.20 1.1.3. System Management Symptom Solution Upgrading from V1.10 will result in denied access to the router via telnet if local users or RADIUS was not configured and saved beforehand System file cannot be accessed for upgrade if remote upgrade process was not completed (answer to query about writing to flash was not received) before the telnet session is terminated The basic version of this release does not support SSH If you add or remove a module, the configuration may be altered. Configure a local user with administrative rights and save the configuration before upgrading to V1.20 remotely A reboot of the router is necessary if a second attempt at upgrading is to be successful Do not power cycle the router until after the upgrade is complete. Use the extended version of this release for SSH support. Save the configuration file and edit it with the new interface numbers so that the file corresponds with the new physical configuration. Insure that the correct agent file has been used before writing to flash memory. Set the time zone if using NTP. If the Master Clock router is rebooted, reset the time on the Master Clock router. All other routers will synchronize with the Master Clock if they are defined as peers. Do not place the T3 or E3 card in slot 2. Use another available slot To support X.21 on 3Com routers, you must use the embedded serial interface or the 4-Port Synchronous/Asynchronous MIM with X.21 support (3C13764) Use HDB3 line code to operate correctly with the Adtran switch. Use the HWTACACS commands for TACACS+ configuration. The router reboots if an invalid agent software file is used to upgrade the device. When a router reboots, the system clock is reset to GMT. On the Router 5680, the T3/E3 MIMs may sometimes not be recognized by the system upon DISPLAY VERSION. X.21 does not work on the 4-Port Synchronous/ Asynchronous MIM (3C13763) or 1-Port Synchronous/Asynchronous SIC (3C13714). The E1 controller does not inter-operate with the Adtran Atlas 830 in PRI or CE1 using AMI line code. TACACS+ appears in the CLI as HWTACACS 1.1.4. Interface Management Symptom Solution Interface changes may require a reset of the interface for changes to take effect. The error message for deleting a PRI is incorrect. Dialer interfaces do not support IP Unnumbered. When initially configuring a virtual template, a reset of all physical interfaces may be necessary. If you make a configuration change to an interface, use the shutdown and undo shutdown commands on the interface.. Use the undo pri-set command instead. Assign an IP address to dialer interfaces. To correct any abnormalities in operations, all physical interfaces related to the virtual template must be shut down together before being brought back up. 5 3Com Router Release Notes for V1.20 Removing the firewall-packet filter command from the interface does not work 1.1.5. Link Layer Protocol Symptom The command must be completed with the “inbound” or “outbound” keyword Solution North American ISDN protocol types cannot be configured on a PRI interface. The LMI Encapsulation type on the 3Com routers is called Non-Standard. Router 3000 series routers do not autonegotiate with the 3Com SSII Dual Speed Hub 500. The dialer disconnect B-channel command uses a timeslot numbering scheme. DSS1 is the only supported protocol type. If the frame relay peer is set to LMI, set the Local Interface to Non-Standard. Adjust the speed and duplex manually on both devices so they match. Disable negotiation mode. The dialer disconnect B-channel command takes a timeslot as an argument. Timeslot 16 is the D channel; the timeslot numbering for the B-channels is 1-15 and 17-31. To disconnect B-channel 30 the user must specify timeslot 31. Omit the hexadecimal ‘0x’ when defining an SDLC address. Defining an SDLC controller address preceded by the hexadecimal designator, ‘0x’ results in ‘Invalid Address’ message. Changing a link from MFR to MP can result in a router reboot When changing from an MFR configuration to a MP configuration, shut down all the physical interfaces used by the Virtual-Template. Save the configuration, reboot the router and undo shutdown on the physical interfaces. 1.1.6. Network Protocol Symptom Solution IGMP query timer defaults to 60. Naming inconsistency with interface and IPX static routes. IPX RIP entries are not aged-out at the userdefined interval. IPX SAP services’ timer and multiplier value configurations are ignored. NAT translates the global interface IP address as well as all internal addresses. Thus, all traffic going out of the NAT interface is translated, including all local interface IP addresses on the router. RTP header compression is not fully supported in this release. Load balancing does not work through recursive lookup. Set the query timer, manually, to 125. When configuring a static route for a network that begins with an alpha character, preface the network with 0x. The IPX RIP table entries are removed from the table if updates for those entries are not received within the default interval of 180 seconds. This value is based upon a default RIP update timer of 60 seconds and a default multiplier of 3. IPX SAP updates are received once a minute regardless of configuration settings. Any IP address (especially that of the global NAT interface) that was not intended for NAT, should be denied translation in an access list. Deny the NAT outbound interface address with an Access List. Refer to 3Com Knowledgebase solution 3KB9241 for more details. RTP header compression is not fully supported in this release. Use MP or OSPF to support load balancing. 6 3Com Router Release Notes for V1.20 When trying to configure a second IPX subinterface with the same IPX frame type, the following error message is displayed: "Same frame type has exist, you can change to another frame type in order to config ipx" 1.1.7. Routing Protocol Symptom To configure multiple IPX networks with the same IPX frame type, you must use separate physical interfaces for each network. Solution Any route policy that uses ACLs defaults to permit all. The OSPF command, abr-summary not advertise is not working correctly. The abr-summary not advertise command does not filter the initial route in a summary update. For example, 128.213.64.0/19 filters the routes 128.213.65.0 to 128.213.95.0 but does not filter 128.213.64.0. Changing the OSPF Area on an interface will delete the OSPF configuration on that interface. Changes to an access list are not applied until the route policy is reapplied. The display bgp route command only shows one route even if multiple (backup) routes are available. RIP MD5 Authentication types are ambiguous. Routing does not function correctly, in a virtual template with MP and OSPF configuration. When using a serial DTE interface, the OSPF cost may not be set correctly. BGP places all internal peers into one peer group by default The router supports only 15,000 entries. Receiving over 15,000 BGP routes may cause the router to hang. With Routing Policies, matching next-hop based on IP prefix list does not actually match the BGP next-hop. Poison Reverse is not supported in this release. With IBGP, importing direct routes will have origin attribute of IGP locally. However, when advertised to a peer, the peer will log the route as incomplete. This is only a problem with IBGP peers. When the default-local-pref command is used with a value other than 100, the value is reverted back to 100 after a reboot. BGP advertises routes when it is out of synchronization with the interior routing protocol Add an explicit deny all or permit all rule at the end of all ACL statements. If necessary, configure an ACL to filter the route. Save the OSPF configuration file before the change. Reapply the route policy immediately after making changes to the access list. The display only shows detail information for the best route. For RIP MD5 Authentication, use the default non-standard value. This is the most common. When using MP with OSPF, you must configure OSPF peer ip address. Set the OSPF cost for the DTE manually. To configure different policies for one peer, place that peer in a separate peer group and define policies for that peer group. Arrange with the local ISP to filter routes before updates can reach the router. Use ACL instead of prefix-list. Poison Reverse is not supported in this release. Correct the issue with an export policy if necessary. Re-configure the default-local-pref value after a reboot. BGP synchronization is not supported. 7 3Com Router Release Notes for V1.20 1.1.8. Multicast Protocol Symptom Solution The router does not support IP multicast forwarding on an IGMP interface without the multicast routing protocol enabled. Enabling ip unnumbered on a PIM-SM interface disables PIM-SM routing. 1.1.9. Security Symptom Keep PIM-SM or PIM-DM enabled on the IGMP interface to insure multicast runs correctly. Do not configure ip unnumbered on a PIM-SM interface. Solution ACL match counts are not logged. IPSec in transport mode will transmit transit traffic with no security headers. IPSec in transport mode is designed for direct communications between two peers running IPSec. IPSec nesting (i.e. the encrypting of already encrypted packets) is not supported in this release. The Encryption card status message, Byte Order: Not consistent with host, can be misleading. Only one security association is used for each ACL-incompatible with per-rule implementation. To telnet or SSH to a 3Com Router there must be a local user defined on that 3Com router. Routers that are defined within a Server ACL on the Master Clock router will not sync to the Master ACL match counting is only supported with the firewall feature. Use Tunnel mode if you are configuring the router to be an IPSec gateway. IPSec nesting is not supported in this release. Disregard this status message. Create one separate ACL for each permit statement in the third-party access list. Configure a local-user on the router for telnet or SSH access From the Master Clock router, define each router as a Peer of the clock source router within a Peer ACL if these routers are to be synchronized by the Master. In addition, direct NTP messages to the master using the unicast server command on the routers. If problems occur with securely managing or pinging the router via an IPSec tunnel, use a software encryption policy instead of an encryption card policy. Enter another view, such as interface view, using the command interface Ethernet 0, then quit. The encryption card in combination with some features may cause ping responses or traffic to be slowed. Example: Encryption card with GRE, MP, IPSec. It is difficult to exit from the SSH public key configuration without a valid key 8 3Com Router Release Notes for V1.20 1.1.10. VPN Symptom Solution The basic version of this release does not support GRE or L2TP. A Windows 2000 or Windows XP client cannot connect to a 3Com router using L2TP over IPSec. Use the extended version of this release for GRE and L2TP tunneling support. L2TP over IPSec support on Windows 2000 or Windows XP clients requires modification of the Windows Registry and a static IP address. Refer to 3Com Knowledgebase solution 3KB9023 for more details. 1.1.11. QoS Symptom Solution NBX Layer 2 traffic cannot be classified for QoS. QoS is not supported with the Encryption card Use Layer 3 prioritization. In order to use QoS with IPSec, use a software encryption policy instead of a hardware encryption card policy. The virtual interface must be shut down by shutting down all of the physical interfaces before the new QoS policy will take effect To restore the weighting constant to its default, use the wred weighting-constant 9 command. To restore the wred ip-precedence parameters to the default, use the following command: wred ip-precedence value low-limit 10 highlimit 30 discard-probability 10 After configuring QoS Policies on a Virtual interface, QoS does not take effect The undo wred weighting-constant command will not execute The undo wred ip-precedence value command will not execute 1.1.12. Dial-Up Symptom Solution The router reboots after a HyperTerminal session is disconnected from the 1-Port Synchronous/Asynchronous SIC, 4-Port Synchronous/Asynchronous MIM, or 4-Port Synchronous/Asynchronous MIM with X.21 support. HyperTerminal is not supported on these modules. 1.1.13. Documentation Symptom Remote console administration can be achieved by dialing into a modem connected to the AUX port configured in flow mode. Solution There is no support for NTP Broadcast Delay, or NTP Synchronization Period in the CLI, yet they remain in the user documents. The setup command is documented but missing. The synchronization command is listed in the documentation but cannot be used. Disregard documentation on these features within the user documents. Use CLI commands for your initial configuration. This command is no longer supported. BGP synchronization is always disabled. 9 3Com Router Release Notes for V1.20 1.1.14. Resolved Issues The following issues have been resolved since the release of V1.10: • A user, logging in as an operator, can no longer see administrator passwords. • RMON MIB tables cannot be created on an Ethernet interface on which RMON is disabled. • The RMON history bucket allocation does not fail if more than 50 buckets are requested. • The src and dst addresses are no longer reversed on RMON Matrix DS tables. • BRI interfaces support ISDN protocol types National ISDN and AT&T 5ESS (Lucent 5E). • MTU size can now be changed from the default of 1500. • Toggling route-reflection with a connection established no longer causes the router to reboot. • A route policy specified in a peer group now takes effect after a reboot. • When using automatic matching order with ACLs, similar rules with different qualifiers are added as separate rules. • Routers no longer reboot after an NBX page is completed. 10 3Com Router Release Notes for V1.20 Changes to 3Com Router Commands The software in the 3Com routers is a subset of the commands used in other 3Com products. Depending on the capabilities of your hardware platform, some commands described in the 3Com Command Reference Guide may not be available on your router, although the unavailable commands may display on the command line interface (CLI). CAUTION: Any command that displays on the CLI, but is not described in the 3Com Command Reference Guide, is not supported in the V1.20 software. 3Com only supports the commands that are described in 3Com Command Reference Guide or are updated in these Release Notes. Other commands may result in the loss of data, and are entered at your own risk. System Management Enable Reverse Telnet Connection Operation Enable the option negotiation towards the Telnet client Disable the option negotiation towards the Telnet client Enable the function of Break-On-Ip of Telnet Disable the function of Break-On-Ip of Telnet Configure X.25 PAD Remote User Previous Command terminal- telnet refuse-negotiation undo terminal-telnet refusenegotiation terminal-telnet break-on-ip undo terminal-telnet break-on-ip New Command reverse-telnet refuse-negotiation undo reverse-telnet refuse-negotiation reverse-telnet break-on-ip undo reverse-telnet break-on-ip Operation Enable the AAA authentication of the X.25 PAD Server end Disable the AAA authentication login pad Previous Command New Command login-method authentication-mode pad scheme name undo login-method authenticationmode pad undo login pad Network Protocol Display and Debug IP Performance Operation Reset the information on IP statistics counters Previous Command reset ip counters New Command reset ip statistics 11 3Com Router Release Notes for V1.20 Hotkeys A hotkey provides a shortcut input method for executing a command line or function. There are system hotkeys and user-defined hotkeys. System hotkeys System hotkeys are the keys conventionally used in the system to represent some fixed command lines. Therefore, the users cannot modify them as desired. The following table lists these hotkeys and the commands that they represent. Hotkey Ctrl+P Ctrl+N Ctrl+B Ctrl+F Ctrl+H Ctrl+Z Ctrl+C Ctrl+] User-defined hotkeys Function Display the previous command from the history buffer Display the next command from the history buffer Move the cursor one character left Move the cursor one character right Erase the character left of the cursor Return to the system view Don't try to connect any more Exit telnet The user can define some hotkeys in the system for any command as desired and pressing the hotkey thus defined will makes the system automatically execute the associated command. Users can define the following eight hotkeys: • • • • • • • • Ctrl + A Ctrl + D Ctrl + R Ctrl + L Ctrl + V Ctrl + W Ctrl + X Ctrl + Y Perform the following configuration in system view. Operation Self-define a hotkey Delete the defined hotkey or restore the default hotkey value Command hotkey hotkey command undo hotkey hotkey 12 3Com Router Release Notes for V1.20 By default, the system has specified the following default values of CTRL+A, CTRL+D, and CTRL+R: • • • CTRL + A equals display current-configuration. CTRL + D equals undo debugging all. CTRL + R equals display ip routing-table. The user can modify the definitions of these three hotkeys as needed. Apply hotkeys You can enter a hotkey whenever you want to execute the associated command. When executing the hotkey, the system will display the associated command on the screen as if the user has input the command in complete form. For example: [3Com] [3Com]display ip routing-table Routing Table: public net Destination/Mask Proto Pre Metric 127.0.0.0/8 DIRECT 0 0 127.0.0.1/32 DIRECT 0 0 Nexthop 127.0.0.1 127.0.0.1 Interface LoopBack0 If the user has input a portion of the command without pressing for confirmation, entering the hotkey will clear all the input characters and displaying the command associated with the hotkey on the screen. This undertaking is equal to the operations of deleting all the input characters and entering the complete form of the command. For example: [3Com]ddddddddddddddddddddd [3Com]display ip routing-table Routing Table: public net Destination/Mask Proto Pre Metric 127.0.0.0/8 DIRECT 0 0 127.0.0.1/32 DIRECT 0 0 Nexthop 127.0.0.1 127.0.0.1 Interface LoopBack0 LoopBack0 Hotkeys and commands operate the same and the actual command is recorded in the command buffer for future query and problem isolation. Display hotkeys Execute the following command in all views. Operation Display hotkeys display hotkey Command The hotkeys displayed by executing the display hotkey command are sorted into the following three categories: • • • Defined hotkeys Undefined hotkeys (the associated commands of these hotkeys are displayed as NULL) System hotkeys. 13 3Com Router Release Notes for V1.20 NEW HARDWARE This release includes new hardware for the Router 3000 and Router 5000 series routers: Router 3000 series router: ■ Router 3015 Router 5009 smart interface card (SIC): ■ 2-Port ISDN BRI U SIC Router 5231, 5640, and 5680 multifunctional interface modules (MIMs): ■ ■ ■ ■ 4-Port Synchronous/Asynchronous Serial MIM with X.21 Support 4-Port E1/CE1/PRI MIM 1-Port Channelized E3 MIM 1-Port Channelized T3 MIM Router 3015 Figure 1 illustrates the Router 3015 router. Figure 1 Router 3015 Power LED 100M Ethernet LED Serial LED BRI LED AUX LED System LED Figure 2 illustrates the back panel of the Router 3015. Figure 2 Back Panel of the Router 3015 OFF ON DC12V CON AUX 100M ETH SERIAL BRI Power switch Power input socket CON port AUX port Grounding 100M screw Ethernet port SERIAL0 BRI port 14 3Com Router Release Notes for V1.20 System Specifications Table 1 lists system specifications for the Router 3015. Table 1 System Specifications for the Router 3015 Item Port Router 3015 Description 1 console port 1 10/100M Ethernet interface 1 AUX port 1 synchronous/asynchronous serial interface 1 ISDN BRI U port Processor SDRAM Flash memory Maximum power Power supply (external) MPC860T 50MHz 64 MB 8 MB 20 W Input voltage and frequency: 100 to 240V AC (the actual range can be 80 to 264 V) 50/60 Hz Input current: 0.5 A to 1A Output voltage: 12V Output current: 4A Dimensions (W X H X D, the highest arc points of the plastic panel) Weight Operating temperature Operating humidity 251mm X 42.5 mm X 187mm (9.9in X 1.7in X 7.4in) 0.75kg (1.65lb) 0 to 40C (32 to 1040F) 5 to 85% (noncondensing) LEDs Table 2 lists and describes the LEDs on the front panel of the Router 3015. Table 2 Router 3015 LEDs LED POWER 100M ETH Description Off means that power is not being supplied. Green means that power is being supplied. Off means that the link is not connected. Flashing green means that data is being sent or received over the Ethernet interface. SERIAL Off means that the link is not connected. Green means that the link is connected. Flashing green means that data is being sent or received over the synchronous/asynchronous port. BRI Off means that no data is being sent or received over the ISDN BRI port and two B channels are free. Flashing green means that data is being sent and received over the ISDN BRI port. 15 3Com Router Release Notes for V1.20 Table 2 Router 3015 LEDs (continued) LED AUX Description Off means that the link is not connected. Green means that the link is connected. Flashing green means that data is being sent or received over the AUX port. SYSTEM Flashing green means that the system is properly working. Always green or off means that the system is incorrectly working. Interface Attributes The Router 3015 provides a console port, an AUX port, a 10/100M Ethernet interface, a synchronous/asynchronous serial interface, and an ISDN U port. Console Port Table 3 lists attributes of the console port. Table 3 Attributes of the Console Port Attribute Connector Interface standard Baud rate Services Description RJ45 Asynchronous EIA/TIA-232 9600 to 115200bps (9600bps is the default) Connects with ASCII terminal Connects with serial interfaces of the local PCs and runs the terminal emulation program on the PCs Command line interface AUX Port Table 4 lists attributes of the AUX port. Table 4 Attributes of the AUX Port Attribute Connector Interface standard Baud rate Services Protocols Description RJ45 Asynchronous EIA/TIA-232 300 to 115200bps Modem dial-up Backup PPP (Point to Point Protocol) SLIP (Serial Line Internet Protocol) MP (Multilink PPP) Ethernet Interface Table 5 lists attributes of the Ethernet interface. Table 5 Attributes of the Fast Ethernet Interface Attribute Connector Description RJ45 16 3Com Router Release Notes for V1.20 Table 5 Attributes of the Fast Ethernet Interface (continued) Attribute Frame format Description Ethernet_II Ethernet_SNAP IEEE 802.2 IEEE 802.3 Operating mode Network protocol 10/100Mbps autosensing Full duplex/half duplex IP (Internet Protocol) Novell IPX (Internet Packet Exchange) Synchronous/Asynchronous Serial Interface Table 6 lists attributes of the synchronous/asynchronous serial interface. Table 6 Attributes of the Synchronous/Asynchronous Serial Interface Description Attribute Connector Interface standard and operating mode Minimum baud rate (bps) Maximum baud rate (bps) Services Synchronous DB50 V.24 (EIA/ TIA-232) DTE, DCE 1200 64 k Leased line Terminal access Backup Protocols PPP MP LAPB (Link Access Protocol-Balanced) HDLC (High-level Data Link Control) SDLC (Synchronous Data Link Control) X.25 Frame Relay PPP SLIP MP V.35 DTE, DCE 1200 2.048 M X.21 DTE 1200 2.048 M DCE 1200 2.048 M 300 115.2 k Modem dial-up Backup V.24 (EIA/TIA-232) Asynchronous ISDN U Port Table 7 lists attributes of the ISDN U port. Table 7 Attributes of the ISDN U Port Attribute Connector Protocol standards Operating mode Description RJ45 Complies with ITU-T I.430, Q.921 and Q.931 recommendations ISDN dial-up ISDN leased line 17 3Com Router Release Notes for V1.20 Table 7 Attributes of the ISDN U Port (continued) Attribute Services Description ISDN ISDN additional services Multi-subscriber number Subaddress Backup 2-Port ISDN BRI U SIC The main functions of the 2-port ISDN BRI U SIC are to transmit and process two channels of ISDN BRI U data stream. The 2-port ISDN BRI U SIC has an integrated NT1 for consolidation of customer premises equipment. The 2-port ISDN BRI U SIC has two types of operating modes: dialing and leased line. The 2-port ISDN BRI U SIC is shown in Figure 3 Figure 3 The 2-port ISDN BRI U SIC Features Table 8 lists features of the 2-port ISDN BRI U SIC. Table 8 Features of the 2-Port ISDN BRI U SIC Attribute Connector type Number of connectors Cable type Protocol standard Operation mode Supported service Description RJ45 2 Telephone cable with ferrite core Comply with the ITU-T I.430, Q.921, and Q.931 Recommendations. ISDN dialing mode ISDN leased line mode ISDN ISDN complementary services Multi-user number Sub-address Backup Supported protocol PPP over ISDN MP Q.921 Q.931 18 3Com Router Release Notes for V1.20 Faceplate and LEDs Figure 4 illustrates the faceplate of the 2-port ISDN BRI U SIC. Figure 4 Faceplate of the 2-Port ISDN BRI U SIC Table 9 lists the status descriptions of the 2-port ISDN BRI U SIC LEDs. Table 9 2-Port ISDN BRI U SIC LEDs B1 Off: Indicates that the B1 channel is idle. Flashing green: Indicates that the B1 channel is occupied and data communication is being conducted. B2 Off: Indicates that the B2 channel is idle. Flashing green: Indicates that the B2 channel is occupied and data communication is being conducted. ACT Off: Indicates deactivation. Flashing green: Indicates activating process. Green: Indicates active status. ON Off: The power to the interface card is disconnected (caused by the failure of power supply to the interface card and so on). Green: The interface card is normally powered on. Note: For ISDN, “active” describes the action or process that a terminal device synchronizes the network clock. It belongs to the physical layer category. To decrease power consumption of the exchange device, usually the terminals and network (LT port) are deactivated. Cable The 2-port ISDN BRI U SIC uses a telephone cable with ferrite core. The standard configuration of the 2-port ISDN BRI U SIC includes the cable. Caution: When the 2-port ISDN BRI U SIC interface cables are used outdoors, you should install a special lightning arrester on the input end of the cable in case of lightening strikes. If the interface card has been properly installed, follow these steps to connect the cable: 1 Power off the router. 2 Before connecting, check the interface connector to avoid incorrectly attaching other connectors and damaging the interface card or the router host. 3 Confirm the type of the ISDN line provided by the ISDN provider. 4 Connect the cable. Directly insert the cable with ferrite core into the BRI U interface of the SIC-1BU/SIC-2BU and the other end into the provider network interface. 5 Power on the Router, check the corresponding LED SLOT1 or SLOT2 on the faceplate of the Router. If the LED is green, it indicates that the interface card has passed the self-test and can operate normally. If the LED is off, it indicates the 19 3Com Router Release Notes for V1.20 failure of the self-test operation. In such a case, contact your Service representative. 6 Check the ON LED on the interface card faceplate. If it is green, it indicates that the interface card is powered on. If it is off, contact your Service representative. 4-Port Synchronous/ Asynchronous Serial MIM with X.21 Support The 4-port synchronous/asynchronous serial module with X.21 supports the X.21, V.35, and V.24 physical interfaces. Figure 5 illustrates the 4-port synchronous/ asynchronous serial module with X.21. Figure 5 4-Port Synchronous/Asynchronous Serial Interface Module with X.21 Features Table 10 lists features of the 4-port synchronous/asynchronous serial module with X.21. Table 10 Features of the 4-Port Synchronous/Asynchronous Serial Module with X.21 Attribute Description Synchronous Connector Number of connectors Interface standard and operating mode Minimum baud rate (bps) Maximum baud rate (bps) Cable V.24 (RS232) DTE cable V.24 (RS232) DCE cable V.35 DTE cable V.35 DCE cable X.21 DTE cable X.21 DCE cable Services supported 1) Leased line 2) Terminal access service 1) Dialup through modem 2) Backup 3) Async leased line 4) Dumb terminal access 64k 2.048M 2.048M 115.2 DB-28 4 V.24 DTE, DCE 1200 V.35, X.21 DTE 1200 DCE 300 RS232 Asynchronous 20 3Com Router Release Notes for V1.20 Table 10 Features of the 4-Port Synchronous/Asynchronous Serial Module with X.21 Attribute Protocols supported Description 1) PPP 2) MP 3) LAPB 4) X.25 5) HDLC 6) SDLC 7) Frame Relay 1) PPP 2) SLIP 3) MP Faceplate and LEDs Figure 6 illustrates the faceplate of the 4-port synchronous/asynchronous serial module with X.21. Figure 6 Faceplate of the 4-Port Synchronous/Asynchronous Serial Module with X.21 Table 11 lists the status descriptions of the 4-port synchronous/asynchronous serial module with X.21 LEDs. Table 11 4-Port Synchronous/Asynchronous Serial Module with X.21 LEDs LINK ACT Off: The link is not connected. Green: The link is connected. Off: No data is being transceived. Flashing green: Data is being transceived. Cable The 4-port synchronous/asynchronous serial module with X.21 uses a synchronous/asynchronous serial interface cable with a DB28 connector. Before connecting to the 4-port synchronous/asynchronous serial module with X.21, confirm the line properties. There are six optional cables depending on different line properties. These six cables are optional and are not automatically provided so you must order one with your 4-port synchronous/asynchronous serial module with X.21 support. ■ ■ ■ ■ ■ ■ V.24 (RS232) DTE Cable V.24 (RS232) DCE Cable V.35 DTE Cable V.35 DCE Cable X.21 DTE Cable X.21 DCE Cable One end of the cables is connected to the router side by a DB-28 connector. The connector at the other end of the cable varies with the requirements of the network side to which it is connected. 21 3Com Router Release Notes for V1.20 V.24 (RS232) DTE Cable The V.24 DTE cable has a DB25 (male) connector at the network end. Figure 7 illustrates the V.24 DTE cable. Figure 7 V.24 DTE Cable DB25 Male Enlarged A side DB28 Male Label Enlarged B s Table 12 lists the V.24 DTE cable pinouts. Table 12 V.24 DTE Cable Pinouts DB28 6 10 7 21 1 9 13 23 27 25 17 3 15 11 22 Shielding shell Signal GND MODE_DCE MODE0 GND TXD+ RXD+ RTS+ CTS+ DTR+ DSR+ RXC+ TXC+ TXCE+ DCD+ LL Core-shielding layer <--> -> <-> <-> <<<-> <-> <--> 1 2 3 4 5 20 6 17 15 24 8 18 Shielding shell Shield GND TXD RXD RTS CTS DTR DSR RXC TXC ETC DCD LTST Core-shielding layer Signal direction <--> DB25 (male) 7 Signal Circuit GND V.24 (RS232) DCE Cable The V.24 DCE cable has a DB25 (female) connector at the network end. Figure 8 illustrates the V.24 DCE cable. Figure 8 V.24 DCE Cable DB25 Female Enlarged A side DB28 Male Label Enlarged B 22 3Com Router Release Notes for V1.20 Table 13 lists the V.25 DCE cable pinouts. Table 13 V.25 DCE Cable Pinouts DB28 6 7 21 19 1 23 13 25 27 15 3 17 11 22 Shielding shell Signal GND MODE0 GND RXD+ TXD+ CTS+ RTS+ DSR+ DTR+ TXCE+ TXC+ RXC+ DCD+ LL Core-shielding layer <--> <-> <-> <-> -> -> <-> <<--> 1 2 3 4 5 20 6 17 15 24 8 18 Shielding shell Shield GND TXD RXD RTS CTS DTR DSR RXC TXC ETC DCD LTST Core-shielding layer Signal direction <--> DB25 (female) 7 Signal Circuit GND V.35 DTE Cable The V.35 DTE cable has a 34PIN (male) connector at the network end. Figure 9 illustrates the V.35 DTE cable. Figure 9 V.35 DTE Cable V.35 Male Enlarged A side DB28 Male Label Enlarged B side Table 14 lists the V.35 DTE cable pinouts. Table 14 V.35 DTE Cable Pinouts DB28 6 10 7 8 21 1 2 19 Signal GND MODE_DCE MODE0 MODE1 GND TXD+ TXDRXD+ <--> -> -> 34PIN (male) A Signal Circuit GND 23 3Com Router Release Notes for V1.20 Table 14 V.35 DTE Cable Pinouts (continued) DB28 20 13 23 27 25 17 18 3 4 15 16 11 22 Shielding shell Signal RXDRTS+ CTS+ DTR+ DSR+ RXC+ RXCTXC+ TXCTXCE+ TXCEDCD+ LL Core-shielding layer Signal direction <-> <-> << -> <-> <--> 34PIN (male) T C D H E V X Y AA U W F J Core-shielding layer Signal RDRTS CTS DTR DSR SCR+ SCRSCT+ SCTSCTE+ SCTERLSD LL Shielding shell V.35 DCE Cable The V.35 DCE cable has a 34PIN (female) connector at the network end. Figure 10 illustrates the V.35 DCE cable. Figure 10 V.35 DCE Cable V .35 Female Enlarged A side DB28 Male Label Enlarged B side Table 15 lists V.35 DCE cable pinouts. Table 15 V.35 DCE Cable Pinouts DB28 6 7 8 21 19 20 1 2 23 13 25 27 Signal GND MODE0 MODE1 GND RXD+ RXDTXD+ TXDCTS+ RTS+ DSR+ DTR+ <--> <<-> -> <-> <-> B P S R T C D H E Shield GND TXD+ TXDRXD+ RXDRTS CTS DTR DSR Signal direction <--> 34PIN (female) Signal A Circuit GND 24 3Com Router Release Notes for V1.20 Table 15 V.35 DCE Cable Pinouts (continued) DB28 15 16 3 4 17 18 11 22 Shielding shell Signal TXCE+ TXCETXC+ TXCRXC+ RXCDCD+ LL Signal direction -> -> -> -> <34PIN (female) Signal V X Y AA U W F J Core-shielding layer SCR+ SCRSCT+ SCTSCTE+ SCTERLSD LL Shielding shell Core-shielding <--> layer X.21 DTE Cable The X.21 DTE cable has a DB15 (male) connector at the network end. Figure 11 illustrates the X.21 DTE cable. Figure 11 X.21 DTE Cable Table 16 lists X.21 DTE cable pinouts. Table 16 X.21 DTE Cable Pinouts DB28 6 10 9 21 13 14 23 24 19 20 1 2 17 18 Shielding shell Signal GND MODE_DCE MODE2 GND RTS+ RTSCTS+ CTS RXD+ RXDTXD+ TXD RXC+ RXC <--> -> -> <<<<-> -> ? <1 3 10 5 12 4 11 2 9 6 13 Core-shielding layer Shield GND Control+ Control Indication+ Indication Receiver+ Receiver+ Transmit+ TransmitTiming+ Timing Shielding shell Signal direction <--> DB15 (male) 8 Signal Circuit GND Core-shieldin <--> g layer 25 3Com Router Release Notes for V1.20 X.21 DCE Cable The X.21 DCE cable has a DB15 (female) connector at the network end. Figure 12 illustrates the X.21 DCE cable. Figure 12 X.21 DCE Cable Table 17 lists the X.21 DCE cable pinouts. Table 17 X.21 DCE Cable Pinouts DB28 6 9 21 13 14 23 24 19 20 1 2 15 16 Shielding shell Signal GND MODE2 GND RTS+ RTSCTS+ CTS RXD+ RXDTXD+ TXD TXCE+ TXCE <--> -> -> <<<<-> -> -> -> 1 5 12 3 10 2 9 4 11 6 13 Core-shielding layer Shield GND Indication+ Indication Control+ Control Transmit+ Transmit + Receiver+ Receiver Timing+ Timing Shielding shell Signal direction <--> DB15 (female) 8 Signal Circuit GND Core-shielding <--> layer Warning: To prevent damage to the router and ports, do not connect or disconnect the interface cable to the 4-port synchronous/asynchronous serial module with X.21 while the router is powered on. Before connecting the 4-port synchronous/asynchronous serial module with X.21, confirm the mode of the equipment that is connected to it (the synchronous/ asynchronous mode, DTE/DCE mode of the peer, and so on), the signaling criterion required by the access equipment, baud rate, and synchronous clock. To connect cables to the 4-port synchronous/asynchronous serial module with X21: 1 Power off the router. 2 Verify the interface type of the peer device and choose the synchronous/ asynchronous serial interface cable of correct type. 26 3Com Router Release Notes for V1.20 3 Plug the DB-28 end of the connection cable to the corresponding DB-28 interface in the 4-port synchronous/asynchronous serial module with X.21. 4 Connect the other end of the cable as appropriate: ■ ■ If the WAN is a leased line, connect the cable to the interface of the CSU/DSU. If the WAN is a dialup line, connect the cable to the serial interface of the analog modem. 5 Power on the router, and check the status of the LINK LED on the faceplate of the router. It flashes green when the module has completed the self-check and works normally. The LINK LED is off if the module fails to pass the self-check or if the line is faulty and the signal is out of step, as described in Table 11. If the LINK LED is off, contact your Service representative. 4-Port E1/CE1/PRI MIM The main function of the 4-port E1/CE1/PRI module is to implement the transceiving and processing of E1 data streams. In addition, it provides access to CE1, and implements the ISDN PRI function so that one board can serve multiple purposes. Figure 13 illustrates a 4-port E1/CE1/PRI module. Figure 13 The 4-Port E1/CE1/PRI Module Features Table 18 lists features of the 4-port E1/CE1/PRI module. Table 18 Features of the 4-Port E1/CE1/PRI Module Attribute Connector Number of connectors Interface standard Interface speed Cables Description DB-25 1 G.703, G.704 2.048Mbps E1 75-ohm non-balanced coaxial cable E1 120-ohm balanced twisted pair cable 120-ohm 4E1 conversion cable 75-ohm 4E1 conversion cable Coaxial connector, network interface connector and 75-ohm to 120-ohm adapter (with BNC connector) Operating mode Network protocols supported E1, CE1, ISDN PRI 1) IP 2) Novell IPX 27 3Com Router Release Notes for V1.20 Table 18 Features of the 4-Port E1/CE1/PRI Module (continued) Services supported 1) Backup 2) Terminal access service 3) ISDN PRI Faceplate and LEDs Figure 14 illustrates the faceplate of the 4-port E1/CE1/PRI module. Figure 14 Faceplate of the 4-Port E1/CE1/PRI Module Table 19 lists the status descriptions of the 4-port E1/CE1/PRI module LEDs. Table 19 4-Port E1/CE1/PRI Module LEDs LED LINK ACTIVE Meaning Off: The link is not connected. Green: The link is connected. Off: No data is being transceived. Green: Data is being transceived. Conversion Cables The 4-port E1/CE1/PRI module uses two types of 1-to-4 conversion cables, the 120-ohm 4E1 conversion cable and the 75-ohm 4E1 conversion cable. At one end of both these cables is the DB-25 connector that connects to the router. At the other end are 4 DB-15 connectors that connect to E1 cables. You can distinguish these two types of cables by the main labels. The 120-ohm 4E1 conversion cable bears the label, 4E1-120Ohm-CAB and the 75-ohm 4E1 conversion cable bears the label, 4E1-75Ohm-CAB. The 75-ohm 4E1 conversion cable uses 8-core coaxial cables but a 120-ohm 4E1 conversion cable uses 4 twisted pair cables. Both the 75-ohm 4E1 conversion cable and the 120-ohm 4E1 conversion cable are provided with the 4-port E1/CE1/PRI module but the E1 cable is optional so you must order it when you order your 4-port E1/CE1/PRI module. Figure 15 illustrates the 120-ohm 4E1 conversion cable and Figure 16 illustrates the 75-ohm 4E1 conversion cable. 28 3Com Router Release Notes for V1.20 Figure 15 120-ohm 4E1 Conversion Cable Figure 16 75-Ohm 4E1 Conversion Cable Table 20 lists E1 cable pinouts. Table 20 E1 Cable Pinouts DB15 9 2 10 8 Tx Tip Tx Ring Tx Shield Rx Tip BNC (75-ohm coaxial cable) Tx Tip Tx Ring Rx Tip RJ-45 (120-ohm twisted pair) 1 2 3 4 Tx Tip Tx Ring Tx Shield Rx Tip 29 3Com Router Release Notes for V1.20 Table 20 E1 Cable Pinouts (continued) DB15 15 7 Rx Ring Rx Shield BNC (75-ohm coaxial cable) Rx Ring RJ-45 (120-ohm twisted pair) 5 6 Rx Ring Rx Shield Table 21 lists 4E1 conversion cable pinouts. Table 21 4E1 Conversion Cable Pinouts DB25 Pinout 2 16 14 1 3 15 0 19 17 4 6 18 0 22 20 8 10 21 12 25 23 11 13 24 Signal TxR4 RxSD4 RxT4 TxT4 TxSD4 RxR4 TxR3 RxSD3 RxT3 TxT3 TxSD3 RxR3 TxR2 RxSD2 RxT2 TxT2 TxSD2 RxR2 TxR1 RxSD1 RxT1 TxT1 TxSD1 RxR1 DB15 Pinout 2 7 8 9 10 15 2 7 8 9 10 15 2 7 8 9 10 15 2 7 8 9 10 15 Signal TxRing RxShield RxTip TxTip TxShield RxRing TxRing RxShield RxTip TxTip TxShield RxRing TxRing RxShield RxTip TxTip TxShield RxRing TxRing RxShield RxTip TxTip TxShield RxRing 1 2 3 4 Serial number Internal DIP Switches The 4-port E1/CE1/PRI module provides internal DIP switches, and the setting of DIP switches decides the interface impedance and grounding mode. On the 4-port E1/CE1/PRI module, DIP switch S4 sets the impedance and grounding mode for interface 2. By default, all the DIP switches for the 4-port E1/CE1/PRI module are switched on so the impedance of the E1 interface is 75-ohm. If you connect a 75-ohm cable, switch BIT1-8 to ON. If you connect a 120-ohm cable, switch BIT1-8 to OFF. Personnel who haven’t received training should not change the position of DIP switch. 30 3Com Router Release Notes for V1.20 Table 22 lists the meaning of DIP switches for 4-port E1/CE1/PRI modules and shows how to set them: Table 22 DIP Switch Settings for the 4E1 Module Configuration of 75-ohm impedance ON ON ON ON ON RxRing grounding mode selection switch RxShield grounding mode selection switch OFF: RxRing is grounded via capacitance. ON: RxRing is grounded directly. ON: RxShield is grounded. OFF: RxShield is not grounded. OFF: RxShield is grounded via capacitance ON: RxShield is grounded directly. Configuration of 120-ohm impedance OFF OFF OFF OFF OFF - DIP 1BIT 2BIT 3BIT 4BIT 5BIT 6BIT Meaning 75-ohm/120-ohm selection switch 7BIT 8BIT SxShield grounding mode selection switch Caution: ■ To avoid damage to the interface module or router, verify that the identifier on the interface is correct. If the 4-port E1/CE1/PRI module is connected to a cable that extends outside the building, you should install a lightning arrester at the input end of the cable to for lightning protection. ■ To connect the interface cable to the 4-port E1/CE1/PRI module: 1 Power off the router. 2 Select the appropriate 4E1 cable and E1 cable according to the type of interface on the remote device, and set the DIP switches of the 4-port E1/CE1/PRI module correctly. ■ If the resistance of the interface in the remote device is 75-ohm, select the E1 75-ohm non-balanced coaxial cable and 75-ohm 4E1 conversion cable and set all the DIP switches on the 4-port E1/CE1/PRI module to ON so the interface resistance is 75-ohm. If the resistance of the interface in the remote device is 120-ohm, select the E1 120-ohm balanced twisted pair cable and 120-ohm 4E1 conversion cable and set all the DIP switches on the 4-port E1/CE1/PRI module to OFF so the interface resistance is 120-ohm. ■ 3 Plug the DB-25 connector of the 4E1 conversion cable into the DB-25 interface of the 4-port E1/CE1/PRI module and secure the screws. 31 3Com Router Release Notes for V1.20 4 Determine the sequence number of the DB-15 connector at the other end of the 4E1 conversion cable and connect it to E1 cable. 5 Connect the E1 cable to the remote device: If you are using a 75-ohm unbalanced coaxial cable and: ■ You do not need to extend the E1 cable, connect the BNC connector of the 75-ohm unbalanced coaxial cable to the remote device directly. You need to extend the E1 cable, connect the BNC connector of 75-ohm unbalanced coaxial cable to a coaxial connector, then connect the other end of the coaxial connector to the remote device through the 75-ohm E1 trunk cable. Make sure that the end of the E1 coaxial cable that is marked TX is connected to the cable of the remote device marked RX and that the end of the E1 coaxial cable marked RX is connected to the cable of the remote device marked TX. See Figure 10. ■ If the remote network device has a 120-ohm interface, you should use 75-ohm to 120-ohm converter, or use a 120-ohm cable instead. If you are using a 120-ohm balanced twisted pair cable and: ■ You do not need to extend the E1 cable, connect the RJ-45 connector of the 120-ohm balanced twisted pair cable directly to the RJ-45 interface of the remote device. If you need to extend the E1 cable, connect the RJ-45 connector of the 120-ohm balanced twisted pair cable to a network interface connector, then connect the other end of the network interface connector to the remote network device using a 120-ohm E1 trunk cable. See Figure 11. ■ Figure 17 Extension Connection of an E1 75-Ohm Unbalanced Coaxial Cable DB-15 BNC Router BNC Network devices, such as leased line Coaxial connector 75-ohm non-balanced coaxial cable 75-ohm E1 trunk cable Figure 18 Extension Connection of an E1 120-Ohm Balanced Twisted Pair Cable DB-15 RJ-45 Router RJ-45 Network devices, such as leased line Network interface connector 120-ohm balanced twisted pair 120-ohm E1 trunk cable 6 Power on the router. 32 3Com Router Release Notes for V1.20 7 Check the corresponding READY LED on the faceplate. ON means the self-check of the module is done, and it can operate normally. OFF means the self-check failed. Contact your Service representative. 8 After powering on, check the status of the LINK LED (synchronous LED) on the faceplate of 4-port E1/CE1/PRI module. If the light is off, signal synchronization failure occurs, in this case, check the line. 1-Port Channelized E3 MIM The main functions of the 1-port channelized E3 module include: ■ In E3 mode, the module can transmit, receive and process one channel of E3 fast traffic, as well as access E3 traffic. In CE3 mode, the module can provide the subscribers with the low-speed accessing service at Nx64kbps, with N smaller than or equal to 128. ■ Note: E3 represents the tertiary group rate of E system in the TDM system, that is, 34.368Mbps. An E3 channel can be channelized into 16 E1 channels through the demultiplexing processes of E23 and E12, with each E1 channel supporting both the E1 and CE1 operating modes. E23 indicates either E2-to-E3 multiplex or E3-to-E2 demultiplex, and E12 indicates E1-to-E2 multiplex or E2-to-E1 demultiplex. E23 and E12 discussed here represent the demultiplex process. Router 5000 series routers support the 1-port channelized E3 module. Figure 19 illustrates a 1-Port Channelized E3 module. Figure 19 1-Port Channelized E3 Module Features Table 23 lists features of the 1-port channelized E3 module. Table 23 Features of the 1-Port Channelized E3 Module Attribute Connector Number of connectors Interface standard Interface rate Interface cable type Operating mode Services supported Description SMB 2 G.703, G.704, G.751 34.368Mbps E3 cable (75ohm coaxial cable) E3 CE3 E3 leased line 33 3Com Router Release Notes for V1.20 Table 23 Features of the 1-Port Channelized E3 Module (continued) Attribute Supported network protocol Protocols supported Description IP IPX X.25 Frame Relay PPP MP HDLC LAPB Faceplate and LEDs Figure 20 illustrates the faceplate of the 1-port channelized E3 module. Figure 20 Faceplate of the 1-Port Channelized E3 Module The following table lists the meanings of the LEDs on the faceplate. Table 24 1-Port Channelized E3 Module LEDs LED LINK ACT Meaning OFF: The link is not set up. ON: The link has been set up. OFF: No data is being transmitted or received. Flashing green: Data is being transmitted and received. Cables The external interface provided by a 1-port channelized E3 module is two SMB sockets respectively for Tx (Transmitter end) and Rx (Receiver end). The interface uses the 75ohm unbalanced transmission mode and uses a pair of 75ohm unbalanced coaxial cables to connect the peer device. Figure 21 E3/T3 cable BNC connector SMB connector Note: 1) The 1-port channelized E3 and 1-port channelized T3 modules use the same E3/ T3 cable. 34 3Com Router Release Notes for V1.20 Caution: If the 1-port channelized E3 module is connected to a cable that extends outside the building, you should install a lightning arrester at the input end of the cable to for lightning protection. 1 Power off the router. 2 Connect the SMB connector of an E3 or T3 cable to the Tx port of the 1-port channelized E3 module and the other end to the Rx port of the peer device. 3 Connect the SMB connector of another E3 or T3 cable to the Rx port of the 1-port channelized E3 module and the other end to the Tx port of the peer device. 4 Power on the router. 5 Check the READY LED for the corresponding slot on the faceplate of the Router. ON means that the POST of the module has finished and the module can work normally. OFF means that the POST failed and you should contact your Service representative. 6 Check the status of the synchronization LINK LED on the faceplate of the 1-port channelized E3 module. OFF means that faults occurred to the link and the signal synchronization failed. In this case, check the line. 1-Port Channelized T3 MIM The main functions of the 1-port channelized T3 module include: ■ In T3 mode, the module can transmit, receive, and process one channel of T3 fast traffic, as well as provide access to T3 traffic. In CT3 mode, the module can provide subscribers with low-speed access at Nx64kbps or 56kbps, with N smaller than or equal to 128. ■ Note: T3 represents the tertiary group rate of T system in the TDM system, that is, 44.736Mbps. A T3 channel can be channelized into 28 T1 channels through the demultiplexing processes of T23 and T12, with each T1 channel also supporting the operating modes of CT1. T23 is used to indicate either T2-to-T3 multiplex or T3-to-T2 demultiplex, and T12 to indicate T1-to-T2 multiplex or T2-to-T1 demultiplex. T23 and T12 discussed here represent the demultiplex process. Figure 22 illustrates the 1-Port Channelized T3 module. Figure 22 1-Port Channelized T3 Module 35 3Com Router Release Notes for V1.20 Features Table 25 lists features of the 1-port channelized T3 module. Table 25 1-Port Channelized T3 Module Features Attribute Connector Number of connectors Interface standard Interface rate Interface cable type Operating mode Services supported Supported network protocol Protocols supported Description SMB 2 G.703, G.704, G.752 44.736Mbps T3 cable (75ohm coaxial cable) T3 CT3 T3 leased line IP IPX X.25 Frame Relay PPP MP HDLC LAPB Faceplate and LEDs Figure 23 illustrates the faceplate of the 1-port channelized T3 module. Figure 23 Faceplate of the 1-Port Channelized T3 Module Table 26 lists status descriptions of the 1-port channelized T3 module LEDs. Table 26 1-Port Channelized T3 Module LEDs LED LINK ACT Meaning Off: The link is not set up. ON: The link has been set up. Off: No data is being transmitted or received. Flashing green: data is being transmitted and received. Cables The 1-port channelized T3 and 1-port channelized E3 modules use the same type of interface cable and make the connection in the same way. For details, refer to “1-Port Channelized E3 MIM”. 36 3Com Router Release Notes for V1.20 37