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Part No. TEL–09949, Rev A
June 2001
Pre-Installation Information and Activities
Page 11 of 34
Refer to Figure 2, which shows pin locations on Modular Nest 21 backplanes.
Modular Nest 9s have a similar layout.
Figure 2. Modular Nest Backplane Pin Locations (Modular Nest 21
Shown)
Caution
If you use a 3263 or 3268 (leased line with dial restoral) modem card with a Busy
Out backplane, remove jumpers from all four pins, or the modem in that slot will not
operate properly. These cards do not support Busy Out.
Jumpers on
Left Pin Pairs
Pins
Pins
Modem A
Modem B
Modular Nest 21
Enclosure, Rear View