Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 61 / 874

Chapter 2 Safety considerations and best practices 61
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Choosing slots for FPs
Determine whether a site record already specifies the slot number of each type
and version of FP for each Passport 15000 or 20000 switch. Otherwise,
consider the following criteria for choosing the slots for FPs before installing
the FPs.
• FPs are installed in slots 1 to 15. Slot 1 can accommodate either the
second CP for redundant (backup) operation or an FP.
• Record the position of each card in your site records by including the
location of the switch, switch identifier, slot number, the FP type as
indicated on the faceplate of the FP itself, and the PEC with vintage.
• When combining DS3 or E3, and OC-n or STM-n FPs, consider
separating them into separate cages of the same switch. If they can not be
separated, install blank processor cards (NTHR64) in any empty slots
between them.
• Since the electrical current from power cables can interfere with the
transmission of signals over coax cable, route coax cables to the right
side of the frame (facing the front) opposite where the power cables can
be when routed under the floor.
• If equipment sparing of optical cards is planned but not being
implemented, install FPs into even-numbered slots first. If equipment
sparing of optical cards is being implemented, install the main FP into an
even-numbered slot other than slot 0 and the spare FP in the adjacent slot
with the next higher number. For more information about main FPs, refer
to 241-5701-600 Passport 7400, 15000, 20000 Configuration Guide.)
• Dual-FP line automatic protection switching (LAPS) protects both the
external line and equipment from failure. To use the LAPS functionality,
spared FPs need to be installed in adjacent slots.
• For a Passport that combines sparing of optical cards with one-for-n (1:n)
sparing of electrical cards, select the slots for all the main and spare
optical cards first. Then use the remaining slots to provide one-for-n
sparing of the electrical cards. This ensures that the electrical cards do
not occupy slots that are needed to provide optical card sparing.
• Providing PVG with hot equipment protection (HEP) requires a
configuration with a Hot 1 + 1 standby OC-3 STM-1 TDM FP, a Hot 1+1
standby VSP FP, and a Hot 1 + 1 standby ATM FP. Providing hitless