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ATM and DSL Interface Configuration

VIEWS: 19 PAGES: 17

									Operation Manual – ATM and DSL Interface (Access Volume)                                                              Table of Contents




                                            Table of Contents

Chapter 1 ATM and DSL Interface Configuration....................................................................... 1-1
     1.1 ATM and DSL Interface ..................................................................................................... 1-1
     1.2 IMA-E1/T1 Interface Configuration .................................................................................... 1-2
           1.2.1 Overview ................................................................................................................. 1-2
           1.2.2 Configuring an ATM E1/T1 Interface....................................................................... 1-3
           1.2.3 Configuring an IMA Group ...................................................................................... 1-4
           1.2.4 ATM IMA-E1/T1 Interface Configuration Example.................................................. 1-5
           1.2.5 Troubleshooting ATM IMA-E1/T1 Interfaces........................................................... 1-6
     1.3 ATM E3/T3 Interface Configuration ................................................................................... 1-7
           1.3.1 Overview ................................................................................................................. 1-7
           1.3.2 Configuring an ATM E3/T3 Interface....................................................................... 1-7
     1.4 ATM OC-3c/STM-1 Interface Configuration ...................................................................... 1-8
           1.4.1 Overview ................................................................................................................. 1-8
           1.4.2 Configuring an ATM OC-3c/STM-1 Interface.......................................................... 1-8
     1.5 ADSL Interface Configuration ............................................................................................ 1-8
           1.5.1 Overview ................................................................................................................. 1-9
           1.5.2 Configuring an ADSL Interface ............................................................................. 1-11
           1.5.3 Upgrading ADSL2+ Card Software ....................................................................... 1-11
     1.6 G.SHDSL Interface Configuration.................................................................................... 1-12
           1.6.1 Overview ............................................................................................................... 1-12
           1.6.2 Configuring a G.SHDSL Interface ......................................................................... 1-13
     1.7 Displaying and Maintaining ATM and DSL Interfaces ..................................................... 1-14
     1.8 Troubleshooting ............................................................................................................... 1-14
           1.8.1 Troubleshooting ATM Interfaces ........................................................................... 1-15
           1.8.2 Troubleshooting DSL Interfaces............................................................................ 1-15




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  Chapter 1 ATM and DSL Interface Configuration

            When configuring ATM/DSL interface, go to these sections for information you are
            interested in:
                 ATM and DSL Interface
                 IMA-E1/T1 Interface Configuration
                 ATM E3/T3 Interface Configuration
                 ATM OC-3c/STM-1 Interface Configuration
                 ADSL Interface Configuration
                 G.SHDSL Interface Configuration
                 Displaying and Maintaining ATM and DSL Interfaces
                 Troubleshooting


1.1 ATM and DSL Interface
            This section covers these topics:
                 ATM and DSL
                 ATM interfaces available for the low-end and mid-range routers
                 ATM interface features

          I. ATM and DSL

            Asynchronous transfer mode (ATM) is a backbone network technology for transmission
            of audio, video, and computer data. By virtue of its flexibility and support to multimedia
            services, ATM is regarded as the core technology for implementing broadband
            communications.
            Digital subscriber line (DSL) is a technology providing high-speed data transmission
            over the copper wire. It includes asymmetric digital subscriber line (ADSL), high-bit-rate
            digital subscriber line (HDSL), very high rate digital subscriber line (VDSL), single-pair
            high-speed DSL defined in ITU-T Standard G.991.2 (G.SHDSL), and symmetric digital
            subscriber line (SDSL). These DSL technologies are different in signal transmission
            speed and distance and uplink/downlink rate symmetric mode (that is, whether uplink
            and downlink rates are the same).
            The ATM physical layer lies at the bottom of the ATM reference model. Though it is
            concerned with transmission media, its functionality does not rely on the transmission
            mechanism and speed of specific medium. Rather, it primarily delivers valid cells and
            the associated timing signals between the upper layer and transmission medium. The
            speeds of physical access media are defined in international standards such as ATM
            OC-3c/STM-1, ATM E3/T3, and IMA-E1/T1. Most DSL applications are ATM-based,




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            combining the advantages of ATM with the low transmission cost feature of DSL. So far,
            DSL technologies have been widely adopted for broadband accessing.

          II. ATM interfaces available for the low-end and mid-range routers

            So far, the low-end and mid-range routers can provide the following ATM interfaces:
                 IMA-E1/T1
                 ATM E3/T3
                 ATM 25.6 Mbps
                 ATM OC-3c/STM-1 based on SONET/SDH
                 ATM ADSL based on the ADSL technology
                 ATM GSHDSL based on the GSHDSL technology
            These interfaces support IPoA, IPoEoA, PPPoA, and PPPoEoA. For more information
            about them, refer to ATM Configuration in the Access Volume.

          III. ATM interface features

            The ATM interfaces support:
                 Nonreal-time variable bit rate (nrt_VBR)
                 Real-time variable bit rate (rt_VBR)
                 Constant bit rate (CBR)
                 Unspecified bit rate (UBR)
                 Permanent virtual circuit (PVC)
                 Per-VC traffic shaping
                 User-to-network Interface (UNI)
                 RFC1483 Multiprotocol Encapsulation over ATM Adaptation Layer 5
                 RFC1577 Classical IP and ARP over ATM
                 F5 end to end loopback OAM
                 ATM adaptation layer 5 (AAL5)


1.2 IMA-E1/T1 Interface Configuration
            This section covers these topics:
                 Overview
                 Configuring an ATM E1/T1 Interface
                 Configuring an IMA Group
                 ATM IMA-E1/T1 Interface Configuration Example
                 Troubleshooting ATM IMA-E1/T1 Interfaces

1.2.1 Overview

            Inverse multiplexing for ATM (IMA) technology distributes an ATM cell stream over
            multiple low-speed links on a cell by cell basis and reassembles the cells into the




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            original stream at the far end. It is a cheap way for you to transmit high-speed ATM cell
            streams over low-speed links while allowing for great flexibility.
            The configuration of IMA-E1/T1 includes two parts: physical level parameters of ATM
            E1/T1 interfaces and IMA features. If no IMA group is configured for transmitting ATM
            cell streams, the cells are distributed directly over E1/T1 links. You can, however,
            assign multiple IMA-E1/T1 interfaces to an IMA group to form a higher-speed IMA
            interface link for ATM cell transmission.
            For both IMA groups and the E1/T1 links outside the groups, you can create PVCs,
            specify service types, and configure the related parameters. For more information
            (including the configuration of PVCs), refer to ATM Configuration in the Access Volume
            of this manual.
            ATM E1/T1 interface configuration includes interface configuration and IMA group
            configuration.

1.2.2 Configuring an ATM E1/T1 Interface

            Follow these steps to configure parameters for an ATM E1/T1 interface:

                        To do...             Use the command...                   Remarks
              Enter system view            system-view                    ––
              Enter ATM E1/T1              interface atm
                                                                          Required
              interface view               interface-number
                                                                          Optional
              Set the clock mode           clock { master | slave }
                                                                          The default is slave.

                                                                          Optional
                              On an E1     frame-format { crc4-adm
              Set the         interface    | no-crc4-adm }                The default is CRC4
              framing                                                     ADM.
              format                                                      Optional
                              On a T1      frame-format { esf-adm |
                              interface    sf-adm }                       The default is ESF ADM.

                              On an E1                                    Optional
                                           code { ami | hdb3 }
              Set the line    interface                                   The default is HDB3.
              coding
              format          On an T1                                    Optional
                                           code { ami | b8zs }
                              interface                                   The default is B8ZS.
                                                                          Optional
              Enable scrambling            scramble
                                                                          Enabled by default.
                                                                          Optional
              Set the cable length         cable { long | short }         The default is long,
                                                                          allowing automatic cable
                                                                          length adaptation.

                                           loopback { cell | local |      Optional
              Set the loopback mode
                                           payload | remote }             Disabled by default.


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                        To do...             Use the command...                  Remarks
                                           See Configuring IMA
              Configure an IMA group                                     Required
                                           Groups



                Note:
            E1 configurations are supported on the IMA (E1) interface module and T1
            configurations on the IMA (T1) interface module.
            The line coding formats for IMA-E1 interfaces and IMA-T1 interfaces are fixed to high
            density bipolar of order 3 (HDB3) and bipolar with 8-zero substitution (B8ZS). They are
            not configurable.




1.2.3 Configuring an IMA Group

            Follow these steps to configure an IMA group:

                        To do...             Use the command...                  Remarks
              Enter system view            system-view                   ––
              Enter ATM E1/T1              interface atm
                                                                         Required
              interface view               interface-number
                                                                         Required
                                                                         This command adds the
                                                                         current interface to the
              Create an IMA group and                                    IMA group identified by
                                           ima ima-group
              assign the interface to an                                 the group-number
                                           group-number
              existing IMA group                                         argument. If the IMA
                                                                         group does not exist, the
                                                                         command creates the
                                                                         group first.
              Return to system view        quit                          —
              Enter IMA group interface    interface ima-group
                                                                         Required
              view                         group-interfacenumber

              Assign an IP address to      ip address ip-address         Required
              the IMA group interface      address-mask                  Not assigned by default

              Set the number of cells in   frame-length { 32 | 64 |      Optional
              an IMA frame                 128 | 256 }                   The default is 128.
                                                                         Optional
                                           ima-clock { ctc
              Set the clock mode for the                                 The default is common
                                           [ link-number number ] |
              IMA group                                                  transmit clocking (CTC)
                                           itc }
                                                                         mode.




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                       To do...              Use the command...                Remarks
                                          ima-standard
              Set the standard to be      { alternate-v10 | normal |   Optional
              adopted by the IMA group    standard-v10 |               The default is normal.
                                          standard-v11 }
              Set the minimum number                                   Optional
              of links required for the   min-active-links number
              IMA group to work                                        1 by default

                                                                       Optional
              Set the maximum link
              delay between the           differential-delay           The default maximum link
              member links in the IMA     milliseconds                 delay between the
              group                                                    member links of an IMA
                                                                       group is 25 milliseconds.
                                                                       Optional
                                                                       If no E1/T1 link is
                                                                       specified, the system
                                                                       sends the test pattern
              Configure IMA group link    ima-test [ link-number       over the first link in the
              test                        number ] [ pattern-id id ]   IMA group by default. If no
                                                                       test pattern is specified,
                                                                       0xAA applies by default.
                                                                       By default, IMA group link
                                                                       test is disabled.




1.2.4 ATM IMA-E1/T1 Interface Configuration Example

          I. Network requirements

            As shown in Figure 1-1, on the IMA-8E1 interface module of the router, create two IMA
            groups, each of which is assigned two links; create two PVCs, setting their peer IP
            address to 10.10.10.10/24; and configure them to support pseudo broadcast.

          II. Network diagram


                              ATM IMA 1
                            10. 110 .110 .1 /24


                                  ……


                              ATM IMA 2
                            10.110 .120 .1 /24

            Figure 1-1 Network diagram for IMA-E1/T1 interface configuration




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          III. Configuration procedure

            # Assign two links to IMA group 1.
            <Sysname> system-view
            [Sysname] interface atm 5/0
            [Sysname-Atm5/0] undo ip address
            [Sysname-Atm5/0] ima ima-group 1
            [Sysname-Atm5/0] interface atm 5/1
            [Sysname-Atm5/1] undo ip address
            [Sysname-Atm5/1] ima ima-group 1
            [Sysname-Atm5/1] quit

            # Assign another two links to IMA group 2.
            [Sysname] interface atm 5/2
            [Sysname-Atm5/2] undo ip address
            [Sysname-Atm5/2] ima ima-group 2
            [Sysname-Atm5/2] interface atm 5/3
            [Sysname-Atm5/3] undo ip address
            [Sysname-Atm5/3] ima ima-group 2
            [Sysname-Atm5/3] quit

            # Create PVCs and assign IP addresses for the IMA groups.
            [Sysname] interface ima-group 5/1
            [Sysname-Ima-group5/1] ip address 10.110.110.1 255.255.255.0
            [Sysname-Ima-group5/1] pvc aaa 1/42
            [Sysname-atm-pvc-Ima-group5/1-1/42-aaa] map ip 10.10.10.10 broadcast
            [Sysname-atm-pvc-Ima-group5/1-1/42-aaa] quit
            [Sysname-atm-pvc-Ima-group5/1] quit
            [Sysname] interface ima-group 5/2
            [Sysname-Ima-group5/2] ip address 10.110.120.1 255.255.255.0
            [Sysname-Ima-group5/2] pvc bbb 1/92
            [Sysname-atm-pvc-Ima-group5/2-1/92-bbb] map ip 10.10.10.10 broadcast


1.2.5 Troubleshooting ATM IMA-E1/T1 Interfaces

            You can start troubleshooting an ATM interface with testing network connectivity using
            the ping command or the extended ping command. In an extended ping command,
            you can specify some options in IP header. For more information on the use of the ping
            command, refer to System Maintaining and Debugging Configuration in the System
            Volume.
            If the interface cannot be pinged, check whether:
                 The interface is down.
                 The AAL5 encapsulation type of the PVC is incorrect.



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1.3 ATM E3/T3 Interface Configuration
            This section covers these topics:
                 Overview
                 Configuring an ATM E3/T3 Interface

1.3.1 Overview

            This section covers only the physical configurations of the ATM E3/T3 interface. For
            more information about how to configure ATM (including PVCs), refer to ATM
            Configuration in Access Volume.

1.3.2 Configuring an ATM E3/T3 Interface

            Follow these steps to configure an ATM E3/T3 interface:

                        To do...             Use the command...                  Remarks
              Enter system view           system-view                    ––
              Enter ATM E3/T3             interface atm
                                                                         Required
              interface view              interface-number
                                                                         Optional
              Set the clock mode          clock { master | slave }
                                                                         The default is slave.

                             On an ATM    frame-format                   Optional
                             E3           { g751-adm | g751-plcp |       The default is the G.751
              Set the        interface    g832-adm }                     PLCP format.
              framing
              format         On an ATM    frame-format { cbit-adm        Optional
                             T3           | cbit-plcp | m23-adm |        The default is the C-bit
                             interface    m23-plcp }                     PLCP format.
                                                                         Optional
              Set the cable length        cable { long | short }
                                                                         The default is short haul.

                                                                         Optional
              Configure scrambling        scramble
                                                                         Enabled by default
                                                                         Optional
              Set the cable length        cable { long | short }
                                                                         The default is short haul.

                                          loopback { cell | local |      Optional
              Set the loopback mode
                                          payload | remote }             Disabled by default




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                Note:
            E3 configurations are supported on the ATM(E3) interface module and T3
            configurations on the ATM(T3) interface module.




1.4 ATM OC-3c/STM-1 Interface Configuration
            This section covers these topics:
                 Overview
                 Configuring an ATM OC-3c/STM-1 Interface

1.4.1 Overview

            This section covers only the physical configurations of the interface. For more
            information about how to configure ATM (including PVCs), refer to ATM Configuration
            in the Access Volume of this manual.

1.4.2 Configuring an ATM OC-3c/STM-1 Interface

            Follow these steps to configure an ATM OC-3c/STM-1 interface:

                        To do...             Use the command...                  Remarks
              Enter system view           system-view                    ––
              Enter ATM OC-3c/STM-1       interface atm
                                                                         Required
              interface view              interface-number
                                                                         Optional
              Set the clock mode          clock { master | slave }
                                                                         The default is slave.

                                                                         Optional
                                          frame-format { sdh |
              Set the framing format                                     The default is the SDH
                                          sonet }
                                                                         STM-1 format.
                                                                         Optional
              Enable scrambling           scramble
                                                                         Enabled by default

                                          loopback { cell | local |      Optional
              Set the loopback mode
                                          remote }                       Disabled by default




1.5 ADSL Interface Configuration
            This section covers these topics:
                 Overview
                 Configuring an ADSL Interface


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                 Upgrading ADSL2+ Card Software

1.5.1 Overview

          I. ADSL Technologies

            Asymmetric digital subscriber line (ADSL) is an asymmetric transmission technology
            that implements high-speed data transmission over twisted-pair copper wire by using
            unused high frequency ranges in the regular telephone line with different modulation
            method. Normally, in the uplink band of 26 kHz to 138 kHz, ADSL can provide
            transmission rates up to 640 kbps (uplink) and in the downlink band of 138 kHz to 1.104
            MHz, it provides transmission rates up to 8 Mbps (downlink).
            Some latest ADSL technologies, however, can provide faster transmission rates by
            improving modulation rate, coding gain, initialization state machine, by reducing frame
            head overhead, and by using enhanced signal processing methods. For example,
            given the same bands, ADSL2 can provide uplink transmission rates up to 1024 kbps
            and downlink transmission rates up to 12 Mbps. By expanding the downlink band from
            1.104 MHz to 2.208 MHz, ADSL2+ can even provide a downlink rate as fast as 24
            Mbps.
            The transmission speed of ADSL is susceptible to transmission distance and line
            quality. While increased transmission distance means decreased line quality and
            transmission rate, decreased transmission distance means the contrary. When setting
            up a link, ADSL can automatically make tuning for a reasonable speed taking into
            consideration actual line conditions such as distance and noise.
            Two types of ADSL modules/cards are available: ADSL over POTS and ADSL over
            ISDN (ADSL-I).

          II. Typical network topology for ADSL routers

            The following figure shows a typical network topology for routers with ADSL interfaces,
            where:
                 DSLAM at the central office (CO) end works as the central office equipment.
                 The router works as the customer premises equipment (CPE).




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                                  Splitter
                           Line              ADSL   ADSL        Eth



              DSLAM                    Phone
                                                       ADSL Router
                                                                          Hub




                                  Phone                      Server   Host A    Host B

            Figure 1-2 Typical network for an ADSL router


          III. Line activation and deactivation

            Before transmitting services, the CPE must activate the line. This is done through
            handshake training and information exchange between the CO equipment and the
            CPE.
            A typical activation process may last 30 seconds, beginning with line negotiation until
            the line comes up. During this process, the two parties examine line distance and
            conditions against the line configuration template (which defines the ADSL criteria,
            channel mode, uplink and downlink speeds, and noise tolerance) and attempts to reach
            an agreement. If the activation succeeds, a communication connection is set up
            between the two parties. When negotiating connection parameters during the line
            activation, the CO equipment plays a master role to provide and decide values for most
            parameters, while the CPE a slave role to accept them.
            Contrary to activation, deactivation tears down the communication connection between
            the two parties. The router tests the performance of the line regularly. Once it finds out
            that the line performance is deteriorating, it automatically deactivates, retrains, and
            reactivates the line.



                Note:
            As ADSL transmission speed depends on distance and line quality heavily, make sure
            regular twisted pairs are used and the cables are well connected when connecting
            ADSL interfaces.



            This section covers only the physical configurations of the ADSL interface. For more
            information about how to configure ATM (including PVCs), refer to ATM Configuration
            in the Access Volume.




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1.5.2 Configuring an ADSL Interface

                        To do...                Use the command...                  Remarks
              Enter system view               system-view                   ––

                                              interface atm
              Enter ATM interface view                                      Required
                                              interface-number
                                                                            Optional
              Activate the ADSL
                                              clock { master | slave }      The interface is active by
              interface
                                                                            default.

                                              adsl standard { auto |        Optional
              Configure the ADSL
                                              g9923 | g9925 | gdmt |        The default is auto
              interface standard
                                              glite | t1413 }               sensing.

              Set the transmit power          adsl tx-attenuation           Optional
              attenuation value               attenuation                   0 by default



                Note:
            To have the adsl standard command take effect, you need to re-activate the interface
            either by performing the shutdown and undo shutdown commands or the activate
            and undo activate commands.




1.5.3 Upgrading ADSL2+ Card Software

            The upgradeable software includes Boot ROM and card software. You first need to load
            the new software by FTP or some other means to the flash memory or the CF card on
            your device. Before performing an upgrade, you need to shut down the interface with
            the shutdown command if the interface is up. After completing the upgrade, you need
            to bring the interface up with the undo shutdown command.
            Follow these steps to upgrade ADSL2+ card software:

                    To do…             Use the command…                          Remarks
              Enter system view        system-view               ––
              Enter ATM interface      interface atm
                                                                 Required
              view                     interface-number
                                                                 Optional
              Shut down the
                                       shutdown                  Skip this step if the interface is
              interface
                                                                 already down.
              Quit to system view      quit                      ––
              Quit to user view        quit                      ––



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                    To do…            Use the command…                          Remarks
                                                                   Required
                                                                   Only distributed devices support the
                                                                   slot slot-no-list option.
                                      bootrom update file
                                      file-url slot slot-no-list   The subslot subslot-no-list option
              Upgrade software        [ subslot                    is not available if the device does
                                      subslot-no-list ] [ all |    not support sub-card-level
                                      part ]                       maintenance.
                                                                   The highest slot number and the
                                                                   highest sub-slot number varies with
                                                                   device models.
              Enter system view       system-view                  ––
              Enter ATM interface     interface atm
                                                                   ––
              view                    interface-number
              Bring the interface
                                      undo shutdown                Required
              up



                Note:
            When executing the bootrom update file command, do not use the all option unless
            absolutely necessary; use the part option instead. If you use the all option, you will find
            it hard to roll back to the old version once the upgrade fails.




1.6 G.SHDSL Interface Configuration
            This section covers these topics:
                 Overview
                 Configuring a G.SHDSL Interface

1.6.1 Overview

            G. single-pair high-speed digital subscriber line (G.SHDSL) is a symmetric transmission
            technology that implements high-speed data transmission over the twisted-pair copper
            wire by making use of the unused high frequency ranges with different modulation
            methods. So far, two types of G.SHDSL are supported: two-wire and four-wire.
            Two-wire G.SHDSL can provide transmission rates up to 2.312 Mbps while four-wire
            G.SHDSL can provide transmission rates up to 4.624 Mbps.
            The transmission speed of G.SHDSL is susceptible to transmission distance and line
            quality. While increased transmission distance means decreased line quality and
            transmission rate, decreased transmission distance means the contrary. When setting




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            up a link, G. SHDSL can automatically make tuning for a reasonable speed taking into
            consideration the actual line conditions such as distance and noise.
            For the networking topology for the routers with G.SHDSL interfaces, refer to that for
            the routers with ADSL interfaces. But note that G.SHDSL interface requires no splitter.
            For a typical network topology for routers with G.SHDSL interfaces, see Figure 1-2. You
            should note that unlike ADSL, G.SHDSL does not use the splitter.
            This section covers only the physical configurations of the G.SHDSL interface. For
            more information about how to configure ATM (including PVCs), refer to ATM
            Configuration in the Access Volume.

1.6.2 Configuring a G.SHDSL Interface

            Follow these steps to configure a G.SHDSL interface:

                     To do…               Use the command…                       Remarks
              Enter system view          system-view                  ––
              Enter ATM interface        interface atm
                                                                      Required
              view                       interface-number
                                                                      Optional
              Activate the G.SHDSL
                                         activate                     The interface is active by
              interface
                                                                      default.

              Set the G.SHDSL                                         Optional
                                         shdsl annex { a | b }
              interface standard                                      Annex B is adopted by default.
                                                                      Optional
                                         shdsl wire { 2 |
                                                                      4-enhanced mode by default
                                         4-auto-enhanced |
              Set the wiring mode                                     This command is available
                                         4-enhanced |
                                         4-standard }                 only if the interface supports
                                                                      four-wire G.SHDSL.

              Set the interface                                       Optional
                                         shdsl mode { co | cpe }
              operating mode                                          CPE by default
                                                                      Optional
                                                                      The default is auto-negotiation
                                                                      mode for the two-wire
                                                                      G.SHDSL interface and 2.312
              Set the single-pair rate   shdsl rate { auto | rate }   Mbps for the single-pair
                                                                      interface rate of the four-wire
                                                                      G.SHDSL interface (four-wire
                                                                      G.SHDSL interface rate is
                                                                      4.624 Mbps).

                                         shdsl snr-margin             Optional
                                         [ current                    By default,
              Set a target margin to
                                         current-margin-value ]       current-margin-value is set to
              the SNR
                                         [ snext                      2, and snext-margin-value is
                                         snext-margin-value ]         set to 0.


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                      To do…                Use the command…                    Remarks
                                          shdsl psd                  Optional
              Set the PSD mode            { asymmetry |
                                          symmetry }                 The default is symmetry.




1.7 Displaying and Maintaining ATM and DSL Interfaces
                        To do…                    Use the command…                   Remarks
              Display the configuration
                                               display interface atm
              and state of a specified or                                       Available in any view
                                               [ interface-number ]
              all ATM or DSL interfaces

                                               display dsl configuration
              Display the actual
                                               interface atm                    Available in any view
              configuration of a DSL line
                                               interface-number
              Display the state                display dsl status interface
                                                                                Available in any view
              information of a DSL line        atm interface-number
              Display DSL version              display dsl version
              information and available        interface atm                    Available in any view
              capabilities                     interface-number
              Display the configuration        display interface
              and state about a specified      ima-group                        Available in any view
              or all IMA group interfaces      [ group-interfacenumber ]
              Display the detailed
              information about a              display status interface
                                                                                Available in any view
              specified IMA group              ima group-number
              interface
              Clear the statistics about all
                                               reset atm interface [ atm        Available in user
              PVCs on the specified ATM
                                               interface-number ]               view
              interface



                Note:
            For those physical interfaces that are not connected to cables, shut down them using
            the shutdown command to avoid anomalies resulted from interference.




1.8 Troubleshooting
            This section covers these topics:
                 Troubleshooting ATM Interfaces
                 Troubleshooting DSL Interfaces



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                                                                     Chapter 1 ATM and DSL Interface
Operation Manual – ATM and DSL Interface (Access Volume)                               Configuration

1.8.1 Troubleshooting ATM Interfaces

            When diagnosing ATM interface problems, first test the interface with the ping
            command or the extended ping command.
            The ping command can test network connectivity. Extended ping command can be
            used to specify some options in the IP header in addition to that function. For more
            information about the ping command, see System Maintaining and Debugging
            Configuration in the System Volume.
            If the interface cannot be pinged, check whether:
                 The interface is down, which causes missing of its route in the routing table.
                 The AAL5 encapsulation of PVC is incorrect (for 155 Mbps ATM interface only).

1.8.2 Troubleshooting DSL Interfaces

            Improper line operation is one of the faults that you may encounter in DSL applications.
            Such a fault is likely to occur on whichever devices or nodes in the hierarchical
            broadband network architecture. It is probably caused by the CPE device, copper wire,
            splitter, DSL port on DSLAM, or even the broadband access server. For this reason,
            you should segment the network to locate the problem. Generally, DSLAM provides
            you with abundant fault isolating methods and a complete guide, which are however,
            beyond the scope of this manual.
            On the CPE, you may do the following when problem occurs:
            1)   Read the LEDs for the DSL interface card
            When the DSL line is training, the LINK LED blinks. After the activation succeeds, the
            LINK LED which should otherwise be OFF lights and stays ON. The Activity LED blinks
            when data being transmitted on the line.
            2)   Display the DSL state information with the display dsl status command
            The State of driver/chipsets field provides the information about interfaces and
            transceiver states.
            Common interface states include Activating, Active, Startupping, Deactive, and Test
            Mode.
            Common transceiver states include Idle, Data Mode, HandShaking, and Training.
            3)   Perform the debugging physical command to view details about activation, such
                 as sending of the activate command, activation timeout, training process, and
                 activation success.
            4)   If line activation attempts always fail, check that the line is securely connected and
                 functioning normally.
            5)   If bit error rate is high or interference happens too often, reset the interface with
                 the shutdown/undo shutdown command or reboot the device and reconnect the




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                                                                   Chapter 1 ATM and DSL Interface
Operation Manual – ATM and DSL Interface (Access Volume)                             Configuration

                 line. If the problem is still there, make an overall line condition and environment
                 check.




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