System SW1 SW2 SW4
If there is only one clock controller card in the system, set to OFF. If there are two clock
controller cards, set to match the cable length between the J3 faceplate connectors.
Determine the total cable length (no single cable can exceed 25 ft.) between the J3
connectors. Both cards must have the same setting.
Table 24: Clock controller switch settings for QPC775
System SW2 SW3 SW4
51C, 61C ON OFF ON
81C OFF OFF ON
Clock controller cabling
The clock-controller cabling for system configurations is shown in Figures 15 to 17, beginning
on page 105.
Clock controller cabling
ISDN Primary Rate Interface Maintenance November 2011 83
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