Nortel NT1R20 Description page 180

Page 156 of 290
553-3001-105 Standard 5.00 June 1999
NT5D33 and NTRB34 Line-side E1 Interface Cards
In a coaxial E1 installation, you will make the connection from the I/O panel
to the E1 link and other external devices through the NT5D36AA Line-side
E1 I/O cable. 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: a DB15
female connector (P2) with an adapter that breaks out Tx (transmit) and Rx
(receive) connectors, which that plug into the E1 line; a DB9 male connector
(P3), which plugs into an external alarm system; a second DB9 male
connector (P5), which connects to an MMI terminal or modem; and 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 41 shows the pin assignments of the LEI backplane and I/O Panel.
Table 41
Line-side E1 card—LEI backplane and I/O panel pinouts (Part 1 of 2)
Backplane
connector pin
12A
12B
13A
13B
14A
14B
15A
15B
16A
16B
17A
I/O Panel
connector pin
1 E1 Tip, Receive data
26 E1 Ring, Receive data
2 E1 Tip, Transmit data
27 E1 Ring, Transmit data
3 Alarm out, normally open
28 Alarm out, common
4 Alarm out, normally closed
29 No connection
5 No connection
30 Away from MMI terminal, receive
data
6 Away from MMI terminal, transmit
data
Signal