Table 8: Clocks as differential pairs
Differential pairs Pin # Row A Row B
Primary 73 +Ref 0A - Ref 0A
Primary 74 +Ref 1A - Ref 1A
Secondary 75 +Ref 0B - Ref 0B
Secondary 76 +Ref 1B - Ref 1A
Automatic clock recovery is done upon the expiration of the free run guard timer. Tracking is
restored to the primary reference clock, if defined. If the primary reference clock is disabled,
tracking is restored to the secondary reference clock, if defined.
Installing the SILC and the UILC
Follow the same procedures as described earlier for line applications (refer to
Installing the
BRSC, SILC, and UILC on page 22).
Connecting the system to the Main Distribution Frame (MDF)
Follow the same procedures as described earlier for line applications (refer to Connect the
modules to the MDF on page 24).
Cross-connecting the Main Distribution Frame (MDF)
The system, in TIE trunk or CO connectivity, requires a different wiring configuration than for
a line application; the transmit and receive pairs should be reversed, as illustrated in Figure
12: Connect the network termination to the U interface and to the S/T interface (in TE
mode) on page 42.
Installing ISDN BRI hardware for trunk applications
ISDN Basic Rate Interface Installation and Commissioning March 2011 41
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