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FSIP Port Adapters, Interface Cables, and Connections
EIA/TIA-449 Connections
EIA/TIA-449, which supports balanced (EIA/TIA-422) and unbalanced (EIA/TIA-423)
transmissions, is a faster (up to 2 Mbps) version of EIA/TIA-232, which provides more functions
and supports transmissions over greater distances. The EIA/TIA-449 standard was intended to
replace EIA/TIA-232, but it was not widely adopted. The resistance to convert to EIA/TIA-449 was
due primarily to the large installed base of DB-25 hardware and to the larger size of the 37-pin
EIA/TIA-449 connectors, which limited the number of connections possible (fewer than is possible
with the smaller, 25-pin EIA/TIA-232 connector).
The router (FSIP) end of all EIA/TIA-449 adapter cables is a high-density 60-pin plug. The opposite
(network) end of the adapter cable provides a standard 37-pin D-shell connector, which is commonly
used for EIA/TIA-449 connections.
Figure 15 shows the connectors at the network end of the adapter cable.
Figure 15
V.35 Connections
The V.35 interface is recommended for speeds up to 48 kbps (although in practice it is used
successfully at up to 4 Mbps).
The router (FSIP) end of all V.35 adapter cables is a high-density 60-pin plug. The opposite
(network) end of the adapter cable provides a standard, 34-pin Winchester-type connector
commonly used for V.35 connections.
Figure 16 shows the connectors at the network end of the V.35 adapter cable.
Figure 16
Note
DCE mode, and a V.35 cable with a receptacle on the network end for DTE mode. You can use these
cables for connecting V.35-equipped systems back to back.
30 Fast Serial Interface Processor (FSIP) Installation and Configuration
EIA/TIA-449 Adapter Cable Connectors, Network End
V.35 Adapter Cable Connectors, Network End
Also available, but not shown in Figure 16, is a V.35 cable with a plug on the network end for
DTE
DCE
DTE
DCE
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