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Connecting to a Transmission Line
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25
Figure 2-4. Modems Installed in the Rack
Connecting to a Transmission Line
The Universal Data Shelf has different Telco options. Your version
may have 16 8-pin modular jack connectors, one for each slot in the
Shelf. It may also have an optional 50-pin mass-termination Telco
connector.
To connect your modem to a leased line using the modular jack
connectors, refer to “Modular Jack Connectors,” below. To use the 50-
pin mass-termination connector, refer to “Mass Termination
Connector” on page 26.
Modular Jack Connectors
The rear panel of the Universal Data Shelf has an 8-pin RJ-45 jack for
each slot in the Shelf. After you install the modem into a slot, connect
the slot’s corresponding RJ-45 jack to a leased line.
Leased lines have four contacts: a transmit (Tx) pair and a receive (Rx)
pair. For communication to occur:
c
The Rx line of the Shelf’s RJ-45 jack must connect to the Tx line
of the other modem.