Figure 25: Back of Media Gateway cable connectors
Figure 26: 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 27: 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 28: Cross-connecting a SILC port to the office wiring on page 71
on
Figure 28: Cross-connecting a SILC port to the office wiring on page 71.
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 29: Cross-connecting a UILC port to
the office wiring on page 72 on Figure 29: Cross-connecting a UILC port to the office
wiring on page 72. The DSLs are not polarity-sensitive, and it is not necessary to maintain
signal polarity along each loop.
Configuring ISDN BRI hardware
68 ISDN Basic Rate Interface Installation and Commissioning March 2011
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