Nortel Communication Server 1000S Installation And Configuration Manual page 95

ISDN Primary Rate Interface equipment overview
Table 20
Clock Controller options - description (Part 1 of 2)
Clock Option Notes
Option 1 This option provides a single CPU system with 2 clock
sources derived from the 2 ports of the DDP.
Connector Clk0 provides a clock source from Port 0.
Connector Clk0 provides a clock source from Port 1.
Refer to Figure 31 "Clock Controller - Option 1"
Option 2 This option provides a Dual CPU system with 2
references of a clock source derived from port 0 of the
DDP.
Connector Clk0 provides a Ref 1 clock source from
Port 0.
Connector Clk1 provides a Ref 2 clock source from
Port 0.
Refer to Figure 32 "Clock Controller - Option 2"
ISDN Primary Rate Interface
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Installation and Configuration