User's Manual

VOLUME III, CHAPTER 3, INU AND INUE INSTALLATION
Function/Requirement Priority Details
Finger-grip fasteners Plug-ins must be withdrawn and inserted using their finger-
grip fasteners/pulls. Never withdraw or insert using attached
cables, as damage to the plug-in connector and its PCB
attachment can occur. If not complied with, the Aviat
Networks warranty may be voided.
Hot-swappable Plug-ins are hot-swappable.
- Removal of an in-service payload plug-in will interrupt its
traffic.
- Removal of the NCC will affect all traffic - unless pro-
tected by an NPC.
- Removal / replacement of the FAN does not affect traffic.
Engaging backplane
connector
When installing a plug-in, ensure its backplane connector is
correctly engaged before applying sufficient pressure to
bring the plug-in panel flush with the front panel.
Revision time lag When swapping or installing plug-ins, up to 60 seconds can
be required for the INU/INUe to show its revised status via
the front panel LEDs, or via Portal.
EMC integrity Plug-ins and blanking panels are held in place by captive
finger-screws. Ensure the finger-screws are fastened as
failure to do so may compromise EMC integrity and fan
cooling.
RACs
Connecting and
disconnecting the ODU
cable at the RAC
Never disconnect or reconnect an ODU cable to a RAC
without first turning the power off to the INU or withdrawing
the RAC from the backplane.
NOTE: The ODU cable provides the power feed to the
ODU. Arcing during connection and disconnection at the
RAC on a live RAC can cause damage to connector contact
surfaces. Power spikes caused by live connection and dis-
connection may also cause errors on other traffic passing
through the INU/INUe. The only exception to live dis-
connection and connection should be for checks of pro-
tected operation at link commissioning.
Removing RAC from a
powered INU
When removing a RAC from a powered INU, always the
disengage the RAC from the backplane before disconnecting
its ODU cable. Similarly before inserting an RAC, always
reconnect the ODU cable before engaging the backplane.
RAC combinations for
INUe
An INUe can be fitted with a maximum of six RACs for one of
the following combinations:
- Six non-protected links
- One protected/diversity link plus four non-protected links
- Two protected/diversity links plus four non-protected
links
- Three protected/diversity links
Before installing more than four RACs refer to the Power
Consumption and INU Load Maximums in Power Supply on
page 72.)
84 AVIAT NETWORKS