Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 372 / 874

372 Chapter 17 Hardware procedures
241-1501-240 5.2S2
Installing a 19-inch sparing panel
Install a 19-inch sparing panel into a NEBS 2000 frame to make use of the
Passport 7400 selection of sparing panels, which are all 19” wide.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• You must install the appropriate adaptor brackets as described in
“Installing NEBS 2000 frame-to-EIA adapter brackets” (page 622).
• This section applies to these sparing panels:
— NTFP99, the 3-port DS3 or E3 sparing panel
— NTHR79, the 4-port DS3 sparing panel
— any of the DS1 or E1 19-inch sparing panels used with packet voice
gateway (PVG) FPs
• Before installing a sparing panel into a NEBS 2000 frame, consider the
following criteria for choosing an efficient and practical location of the
panel within the frame.
— For frames with one switch, install the sparing or fanout panels on
only the rear uprights and facing inwards.
— Determine whether the panel will face into the frame or out of it. For
example, outwardly facing panels with coax cables that have straight
connectors will exceed the perimeter of the NEBS 2000 footprint.
When adding sparing panels to a frame that already has a switch in
it, mounting the sparing panels at the rear and facing inwards
enables easier connection access for maintenance or redeployment
of cables.
— For one or more panels, determine the impact of the cable density
that will be connected to each faceplate. Determine the accessibility
to the faceplate especially to read cable connection information and
if panels are to be installed on both sides of the frame. Confirm the
routing path that the cables must follow to the FPs and the other end
of the FP connection can safely accommodate the density of cables.
Choose an optimum access and the least congested route.