Nortel Communication Server 1000S Installation And Configuration Manual page 71

Figure 21
SILC port designation label at the cross-connect terminal
TX-
TX-TX+RX+
TX+RX+ 1
RX-
RX-0
Figure 22
UILC port designation label at the cross-connect terminal
T R T R
0 1
TX-TX+RX+ TX-TX+RX+
2
RX- RX-
Note: The pair designated TX- TX+ is the transmit pair. The pair
designated RX- RX+ is the receive pair. A SILC port supplies 2 W of
power at -48 V (-40 V for Europe), simplexed over the transmit and
receive pairs. The transmit pair is negative with respect to the receive
pair.
T R T R
2 3
Note: The cable pair designated T R is a 2B1Q full-duplex U interface.
Cross-connecting the DSLs
Each SILC provides eight four-wire, full-duplex ports. These ports connect to
building wiring facilities to form DSLs. Since the DSLs are polarity-
sensitive, maintain signal polarity along each loop as shown in Figure 23 on
page 74.
Each UILC provides eight two-wire full-duplex ports. These ports connect to
twisted pair building wiring facilities to form DSLs as shown in Figure 24 on
page 75. The DSLs are not polarity-sensitive, and it is not necessary to
maintain signal polarity along each loop.
ISDN Basic Rate Interface
Configuring ISDN BRI hardware
TX-TX+RX+
3 4
RX-
T R T R
4 5
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TX-TX+RX+ TX-TX+RX+
5 6
RX- RX-
T R T R
6 7
Installation and Configuration
T
X
0
7
0