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If you are connecting your phone lines (-21 series rack) to the 50-pin connector on the backplane of the
rack, plug the appropriate phone cable into the appropriate 50-pin connector (RJ21X). RJ21X
connectors are TN circuits.
Note: Three 50-pin connectors are mounted on the back of the -21 series rack backplane (See Figure 2-3).
The left 50-pin connector (labeled Dial-Up/2-Wire Leased Line) is used to connect all the modems in the -21
series rack to dial-up phone lines. When 4-wire leased lines are being connected, the two right 50-pin
connectors (labeled 2-wire Lease Line/4-wire Transmit Pair on the right and 4-wire Receive Pair in the
center) are used to connect the rack to leased lines. When connecting to 2-wire leased lines, you must first
determine if your modem has dial back-up capability. If it does, then use the right connector. If it does not,
then use the left (2-wire Lease Line) connector.
13. If an AC power source is being used, plug the AC power cord supplied with the rack into the power cord
connector on the back of the rack and to a live AC outlet.
If a DC power source is being used, connect the negative lead from the DC supply to the left terminal on
the terminal block on the back of the rack and the positive lead from the DC supply to the right terminal
on the rack.
7 6
9 8
11 1 0
12
14 13
16 15
Figure 2-3. -21 Series Connectors
Chapter 2 - Installation
50 Pin Connectors
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