Nortel Communication Server 1000M, Руководство по установке и настройке

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Configuring ISDN BRI hardware Page 71 of 120
ISDN Basic Rate Interface Installation and Configuration
Figure 21
SILC port designation label at the cross-connect terminal
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.
Figure 22
UILC port designation label at the cross-connect terminal
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.
TX-
TX+RX+
RX-0
TX-TX+RX+
RX-
1
TX-TX+RX+
RX-
2
TX-TX+RX+
RX-
3
TX-TX+RX+
RX-
4
TX-TX+RX+
RX-
5
TX-TX+RX+
RX-
6
7
T
X
T R
0 T R
1 T R
2 T R
3 T R
4 T R
5 T R
6 T R
7
0
0