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Page 28 of 46 Install ISDN BRI hardware
553-3901-200 Standard 7.00 January 2002
Cross-connect the MDF
The MDF cross-connects NE-A25B cables connected to SILC and UILC
ports with building wiring connected to ISDN BRI terminals.
Each SILC provides eight four-wire full duplex ports. These ports are
connected to building wiring to form DSLs. These ports are polarity sensitive.
Signal polarity must be maintained along each loop.
Each UILC provides eight two-wire full duplex ports. These ports are
connected to twisted pair building wiring to form DSLs. These DSLs are not
polarity sensitive and, although it is recommended, it is not necessary to
maintain signal polarity along each loop.
Figure 7 and Figure 8 illustrate, respectively, a cross-connection of an SILC
port and an UILC port to the building wiring.
L TR
0
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
TR
7
L
M TR
0
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
TR
7
M
N TR
0
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
TR
7
N
R TR
0
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
TR
7
R
S TR
0
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
TR
7
S
T TR
0
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
TR
7
T
U TR
0
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
TR
7
U
Note: The cable pair designated TR is a 2B1Q full duplex U interface.
Table 3
UILC port designation labels at the MDF: NT8D37 IPE Module (16-cable configuration)
(Part 2 of 2)
9
10
11
12
13
14
15