Nortel Communication Server 1000S Installation And Configuration Manual page 77

Table 17 shows the connector pin assignment for the jack and the plug. It also
shows the signal names for each interface pin at the SILC and at the terminal.
Table 17
S/T interface connector specification
RJ45 jack
Pin number pin signal name
1 Power Source 3
2 Power Source 3
3 TX +
4 RX +
5 RX -
6 TX -
7 Power Sink 2 (-)
8 Power Sink 2 (+)
Note 1: Power Source 1 (PS1): Up to 2 Watts of power is supplied by
the SILC to the terminals on the DSL. This power is simplexed over the
TX and RX pairs provided by -48 V (-40 V for Europe) supply on the
SILC. The RX pair is positive with respect to the TX pair.
Note 2: Power Sink 2 (PS2) provides an optional means of powering the
terminal from a common supply in the wiring closet.
Note 3: Power Source 3 (PS3) provides the power from the terminal to
the NT1 if the NT1 does not have a local power source.
U interface specification
The U interface uses a 2-conductor, twisted pair cable terminated with an
RJ-45 type jack. An RJ-45 type jack on the NT1 device connects the terminal
to the DSL using this twisted pair cable.
ISDN Basic Rate Interface
Configuring ISDN BRI hardware Page 77 of 120
SILC
signal name
No connection
No connection
RX +
TX +
TX -
RX -
No connection
No connection
Installation and Configuration