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COMSPHERE 3821Plus Modem
2-2 February 1998 3821-A2-GB20-30
P26 P25
P24
P23
P20 P19
J2 P22
J1
P21
495-14854
TO P23
OR P25
TO P24
OR P26
NETWORK
INTERFACE
MODULE
(NIM)
NIM COVER
STANDOFF
Figure 2-1. Installing the NIM
Install the NIM
A NIM can be installed on the left or right side of the
back of the 3000 Series Carrier.
" Procedure
1. If you are installing a NIM on the right side of the
carrier, press it onto the connectors P24 and P23. If
you are installing a NIM on the left side of the
carrier, press it onto the connectors P26 and P25.
2. Fasten the NIM to the carrier with the four
standoffs provided. See Figure 2-1.
3. Position the NIM cover over the NIM.
4. Fasten the NIM cover in place with the four screws
provided. See Figure 2-1.
Cable the NIM
Connect one end of the short ribbon cable to the 50-pin
connector at the bottom of the NIM. Connect the other
end to P21 (on the right side of the carrier) or P22 (on the
left side of the carrier). See Figure 2-2.
Connect a network interface cable to the 50-pin
connector in the middle of the NIM. Connect the other
end to the dial or leased-line interface. This may be an
RJ11 gang box or a 66A-punchdown block. Wiring for the
50-pin NIM cable is shown in Appendix E.
A 2-wire leased line connection to a JM8 interface
requires a 6-position to 8-position crossover cable. See
Appendix E.
495-1479
8
NETWORK INTERFACE
CABLE
P21 or P22
SHORT
RIBBON
CABLE
Figure 2-2. Cabling the NIM