Nortel Networks Circuit Card User Manual
Page 275
NT5D33 and NT5D34 Lineside E1 Interface cards
Page 275 of 906
Circuit Card
Description and Installation
This cable consists of a 25-pair amphenol connector (P1) on one end which
plugs into the I/O panel. The other end has 4 connectors:
1
a DB15 female connector (P2) with an adapter that breaks out Tx
(transmit) and Rx (receive) connectors, which that plug into the E1 line
2
a DB9 male connector (P3), which plugs into an external alarm system
3
a second DB9 male connector (P5), which connects to an MMI terminal
or modem
4
a DB9 female connector (P4), which connects to the next LEI’s P4
connector for MMI daisy chaining. The Tx marking on the adapter at P2
is the LEI output. The E1 data stream coming from the network into the
LEI connects at the Rx coaxial connector
Table 102 shows the pin assignments of the LEI backplane and I/O Panel.
Table 102
LEI card – LEI backplane and I/O panel pinouts (Part 1 of 2)
Backplane
connector pin
I/O Panel
connector pin
Signal
12A
1
E1 Tip, Receive data
12B
26
E1 Ring, Receive data
13A
2
E1 Tip, Transmit data
13B
27
E1 Ring, Transmit data
14A
3
Alarm out, normally open
14B
28
Alarm out, common
15A
4
Alarm out, normally closed
15B
29
No connection
16A
5
No connection
16B
30
Away from MMI terminal, receive
data