Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 606 / 874

606 Chapter 17 Hardware procedures
241-1501-240 5.2S2
— record the same connection information at the FP end and the other
end onto the label on the tray
— route all fiber cables into one side of the fiber management unit and
out the same side to the connections at the other end
• Since the NTHW50 accommodates 20 fiber cables per drawer, you may
wish to route the fiber cables of each cage into a separate drawer or set of
drawers. Use the bottom drawer or drawers for the bottom cage. There is
space on the drawer faceplate to add your own labels to indicate, for
example, the type of FP and its location information.
• When a cage has empty slots covered by blank processor cards that may
eventually contain optical FPs, you may wish to leave a series of vacant
trays in the middle of the overall sequence of routing.
• A ladder-rackable fiber cable will not likely ravel onto a tray because
either the cable is too stiff (cannot meet the required bend radius) or its
diameter is too thick. Supported fiber cable specifications for the unit are
identified per FP type in 241-1501-200 Passport 15000, 20000 Hardware
Description.
Procedure steps
1 Measure the exact path that the fiber cable is intended to be routed from
the fiber management unit to the next hop connection towards the far end.
Measure from the side of the fiber unit where the fiber cable will exit.
2 Using a piece of electrical tape, temporarily mark that distance on the
fiber cable from the unconnected end. Ensure that the tape can be easily
removed later, but will not move during minor handling.
3 At the fiber unit, open the drawer by sliding the latches towards each
other, holding them inwards, and pulling slowly towards yourself. Stop
pulling when the rear of the drawer is at the front of the fiber unit. As the
drawer opens, half-spools at the sides of the drawer will move with it
towards the front. If a half-spool does not reach the front of the drawer,
move it manually. The rear half-spools are fixed.
If the drawer already contains fiber cables, ensure that no cable is
snagged or pinched as the drawer opens.
4 Route the cable from the FP faceplate towards the fiber management unit.
Use tie-wraps to very loosely fasten the cable at bends in the path. Leave
the tie-wraps open enough to accommodate more fiber cable connectors.