Nortel Passport 7400, Установка оборудования, техническое обслуживание и устранение неисправностей, Страница: 103 / 438

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Passport 7400 Hardware Installation, Maintenance, and Upgrade 5.2S1
Chapter 19
External timing addition
Add external timing to improve the reliability and availability of timing
distribution.
• “Prerequisites to external timing addition” (page 103)
• “External timing addition task flow” (page 103)
Prerequisites to external timing addition
• Some of the procedures in this task are not located in this NTP. Ensure
you have access to the required NTPs.
• To add external timing functionality, you require one or two
CP-with-BITS (NTNQ03), a BITS termination panel (NTPS13) and one
or two BITS cables (NTPS18).
• Sparing is not supported between a CP and a CP-with-BITS when
external timing is provisioned. Both CPs must be of the type,
CP-with-BITS for sparing to be supported.
• Sparing is supported between a CP and CP-with-BITS if external timing
is not provisioned.
• If you are replacing a CP with a CP-with-BITS, but will not enable the
external timing functionality the replacement procedure is the same as
for any CP upgrade. See “Control processor upgrade” (page 93).
External timing addition task flow
This task flow shows you the sequence of procedures you perform to add
external timing functionality. to link to any procedure, go to “Task flow
navigation” (page 104).