Nortel NT1R20 Description page 182

Page 158 of 290
Table 42
Line-side E1 card—Line-Side E1 I/O cable pinouts (Part 2 of 2)
I/O Panel
Connector
Pin
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
553-3001-105 Standard 5.00 June 1999
NT5D33 and NTRB34 Line-side E1 Interface Cards
Lead Designations
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 42 on page 157.
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 equipment
that is hardwired without carrier facilities. If the LEI is connected via 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 CPE equipment at the distant end will likewise have transmit and receive
wired straight from the RJ48 demarc at the distant end of the carrier facility.
LEI
LEI Cable Connector to External
Connector
Pin
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
(P4)
9
3
2
Equipment