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Data Switching is the number of data terminal equipment (DTE), between any two terminal devices to establish data communication channel is called the temporary interconnection of data exchange.
Multi Channel ASI Data Switch DEV 1820/xx Multi Channel ASI Redundancy Switch Features: ASI data switching cards 75 Ohm with BNC connectors 4 channel up to 16 channel versions available redundant power supplies with alarming function Ethernet with SNMP Application Areas: Cable Head End Stations DEV 1820/xx Multi Channel ASI Redundancy Switch The Problem A lot of signal transmission systems require a very high uptime. In case of a defect – i.e. if a signal transmitter breaks down – it is essential to solve this problem fast and efficiently, so that the end user does not notice the defect at all. Precautions on behalf of the provider, e.g. spare instruments in “hot standby” are necessary to avoid the worst case scenario. DEV Systemtechnik worked out a solution To solve this problem and to ensure that the network providers have a high level availability of their signals, DEV Systemtechnik has developed the Multi Channel 1 to 1 Redundancy Switch 1820/xx for ASI data streams. The Technical Concept Front View DEV 1820 The DEV 1820/xx is available in different configurations. The number behind the slash (“/”) indicates the number of signal paths, e.g. 12. The number of signal paths can be between 4 and 16. In any case, it is possible to switch each channel individual or simultaneously in groups 1-4, 5-8, 9-12, 13-16. The unit is delivered with RS 232, Ethernet control and redundant power supplies. Rear View DEV 14-0001 ASI redundancy switch card, 30…540 MHz, 75 Ohm, BNC Connectors. ASI data streams applied to the two input ports can be switched. The switched signal is made available simultaneously at three parallel outputs. For ASI signals the cards do not serve only as a redundancy switch, but also as a distribution amplifier. Switching Schematics The unused input is terminated internally. Out 3 The switching is done with failsafe relays. In case of total power loss input A is routed to 2 Out 2 output 1. In A The transmission of DC is blocked. 1 1 2 2 Out 1 2 2 1 1 In B Pos 1 without el.power 1 Pos 2 with el.power Technical Data: RF Specifications: Frequency range: 30…540 MHz Impedance: 75 Ω Connectors: BNC (f) on the rear side of the instrument No. of input ports per channel: 2 No. of output ports per channel: 3 No. of channels per card: 1 No. of functional cards: 4, 8, 12, 16 Signal: ASI/0,8 V Input level: 100…800 mV Output level: >600 mV Isolation on/off: >50 dB Switching cycles: >10E6 Relay type: failsafe Remote interface: RS 232, RS 422, RS 485 and Ethernet Connectors: Sub-D 9(f) and RJ45 Remote control: Ethernet SNMP, RS 232 (9600 7 ODD1) PROSAN protocol Alarms: Two stage alarm signalisation for power line failure: Potential free contacts Alarm connector: Sub-D 9(m) Contact load: 60 V; 0,3 A B-Alarm: One power supply unit does not provide any secondary power. A-Alarm: Both power supply units do not provide any secondary power. Redundant Power Supply: Redundant power supplies: 100…260 V AC out of two different phases, +24 V DC Power consumption: 40 VA General Specifications: Housing: 19“, 3 HU, 420 mm depth Weight: ~8 kg Environmental conditions: ETS 300019 Part1-3 Class 3.1 Order Information DEV 1820/xx Multi Channel ASI Redundancy Switch (xx defines the number of channels. Possible numbers are 4, 8, 12, 16) Technical specifications are subject to change DEV Systemtechnik GmbH & Co. KG Grüner Weg 4A D-61169 Friedberg Tel: +49 (0)6031/18999-0 Fax: +49 (0)6031/18999-15 email@example.com www.dev-systemtechnik.com Rev. 01/2007
"Multi Channel ASI Data Switch"