Nortel Passport 15000 Hardware Installation And Maintenance page 637

Table 25
Pinouts of the J3 and J4 connectors for E1 unbalanced
Pin J3 E1 signal,
unbalanced
1-1 BITSRXBN
2-1 no connection
1-2 BITSRXBP
2-2 no connection
1-3 no connection
2-3 no connection
Note: E1 unbalanced uses D-sub coax cables.
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade
J4 E1 signal, Description of the connection
unbalanced
BITSRXAN BITS receive (signal is from the external clock into the
BITS interface) reference B (or 2) or A (or 1), negative (for
unbalanced means ground)
no connection no connection
BITSRXAP BITS receive (signal is from the external clock into the
BITS interface) reference B (or 2) or A (or 1), positive (for
unbalanced means signal)
no connection no connection
no connection no connection
no connection no connection
Chapter 17 Hardware procedures 637
5.2S2