Nortel Circuit Card Installation Manual page 277

Table 103
LEI card – lineside E1 I/O cable pinouts (Part 2 of 2)
I/O Panel
Connector
Pin Lead Designations
4 Alarm out (normally
closed)
7 Toward MMI terminal,
receive data
31 Toward MMI terminal,
transmit data
33 Ground
8 Control 1
32 Control 2
33 Ground
8 Control 1
32 Control 2
30 Away from MMI terminal,
transmit data
6 Away from MMI terminal,
receive data
NT5D33 and NT5D34 Lineside E1 Interface cards
E1 Connections
For twisted-pair installations, E1 signaling for all 30 channels is transmitted
over P2 connector pins 1, 3, 9, and 11, as shown in Table 103 on
Plug the DB 15 male connector labeled "P2" into the E1 link. E1 transmit and
receive pairs must be turned over between the LEI and the CPE that is
hardwired without carrier facilities. If the LEI is connected through E1 carrier
facilities, the transmit and receive pairs must be wired straight through to the
RJ48 at the Telco demarc, the LTU, or other E1 carrier equipment. The E1
LEI
Connect LEI Cable Connector to External
or Pin Equipment
3
2
DB9 male toward MMI (P5).
3
Wired as DCE.
Data is transmitted on pin 2 (RXD)
and received on pin 3 (TXD)
5
7
9
5
7
DB9 female away from MMI terminal
9
(P4)
3
2
Circuit Card
Page 277 of 906
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Description and Installation
276.