Note:
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.
The connector pin assignments for the jack and the plug are shown in
Table 17: U interface
connector specification on page 74. The table also shows signal names for each interface
pin at the UILC and at the terminal.
Table 17: U interface connector specification
Pin number RJ45 jack pin signal name UILC signal name
1 Not used No connection
2 Not used No connection
3 Not used No connection
4 Tip or Ring Tip or Ring
5 Tip or Ring Tip or Ring
6 Not used No connection
7 Not used No connection
8 Not used No connection
Connecting the ISDN BRI terminals to the DSL
1. Plug one end of the modular cable into the ISDN BRI interface connector on the
terminal. Plug the other end of the modular cable into the telephone outlet.
2. If the SILC S/T interface has an optional auxiliary power source, plug the power
source into the wall outlet and then the 10-m (33-ft) modular cable into the power
source's RJ-45 type jack.
The power source must not feed the power back into the DSL through the RJ-45
wall outlet, only to the local ISDN BRI terminal. The power adapter is normally
supplied with the terminal.
Figure 30: Connecting the ISDN BRI terminal to the S/T interface on page 76
illustrates an ISDN BRI terminal connection to an S/T interface. Figure 31:
Connecting the ISDN network terminator to the U interface on page 77 illustrates
an ISDN BRI terminal connection to a U interface.
3. Enter the Static TEI at the terminal.
Configuring ISDN BRI hardware
74 ISDN Basic Rate Interface Installation and Commissioning March 2011
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