Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño
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Mounting Multiple Shelves
If incremental shelves are to be installed, Cisco recommends that they be installed from the
bottom of the equipment rack to the top to simplify cabling. However, shelves may be added in
any position so long as proper bay cabling is selected.
Incremental ONS 15454 shelves can be installed by local technicians. Most standard seven-foot
racks can hold four ONS 15454 shelves and a fuse and alarm panel. However, unequal flange
racks are limited to three ONS 15454 shelves and a fuse and alarm panel or four ONS 15454
shelves and a fuse and alarm panel from an adjacent rack.
If you plan to use the external (bottom) brackets to install the fan-tray air filter, you can install
three shelf assemblies in a standard seven-foot rack. If you do not use the external (bottom)
brackets, you can install four shelf assemblies in a rack. The advantage to using the bottom
brackets is that you can replace the filter without removing the fan tray.
If incremental shelves are to be installed, Cisco recommends that they be installed from the
bottom of the equipment rack to the top to simplify cabling. However, shelves may be added in
any position so long as proper bay cabling is selected.
Incremental ONS 15454 shelves can be installed by local technicians. Most standard seven-foot
racks can hold four ONS 15454 shelves and a fuse and alarm panel. However, unequal flange
racks are limited to three ONS 15454 shelves and a fuse and alarm panel or four ONS 15454
shelves and a fuse and alarm panel from an adjacent rack.
If you plan to use the external (bottom) brackets to install the fan-tray air filter, you can install
three shelf assemblies in a standard seven-foot rack. If you do not use the external (bottom)
brackets, you can install four shelf assemblies in a rack. The advantage to using the bottom
brackets is that you can replace the filter without removing the fan tray.
Fan-Tray Assembly
Do not operate an ONS 15454 without the mandatory fan-tray air filter.
The fan-tray assembly is located at the bottom of the ONS 15454 fan-tray assembly. The fan tray
is a removable drawer that holds fans and fan-control circuitry for the ONS 15454. The front door
can be left in place or removed before installing the fan-tray assembly. After you install the fan
tray, you should only need to access it if a fan failure occurs or you need to replace or clean the
fan-tray air filter.
The front of the fan-tray assembly has an LCD screen that provides slot and port-level information
for all ONS 15454 card slots, including the number of Critical, Major, and Minor alarms. The LCD
also tells you whether the software load is SONET or SDH and the software version number.
Release 4.0 allows you to modify parameters and control the following displayed information:
Suppression of LCD IP display
Display of the NE defaults name
Alarm output one-button toggle (alarm counts and alarm summary in the LCD are
displayed alternately)
You can also modify display parameters to prohibit configuration changes via the LCD display
touchpad.
The fan-tray assembly features an air filter at the bottom of the tray that you can install and
remove by hand. Remove and visually inspect this filter every 30 days and keep spare filters in
stock. Refer to the Cisco ONS 15454 Troubleshooting Guide for information about cleaning and
maintaining the fan-tray air filter.
Fan-Tray Selection
There are presently two series of fan tray assemblies available for the ONS 15454: the FTA3-T
high airflow assembly and the FTA2 standard airflow assembly. The FTA3-T should be used for
all new installations and offers higher airflow capabilities required to support systems equipped
with XC-10G cross-connect cards and is rated for industrial temperature installations (-40 to +65
Celsius). The FTA3-T employs a positive stop insertion pin to prevent the installation of the fan
tray assembly into shelf assembly versions prior to the current ANSI offering. Use Table 7-3 to
select the fan-tray assembly that is compatible with the version of shelf assembly you plan to use.