Juniper BT8A78CH1, Обзор оборудования и руководство по установке

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Without being limited to the foregoing, a service module might undergo a
warm reload in the following situations:
• The user issues an operator command that warm reloads the service
module.
•
The user issues an operator command that cold or warm reloads the Chassis
Management Module (CMM) in a single CMM system.
• The user performs a software upgrade of the chassis.
• The user restores a configuration database to the chassis.
•
The user replaces the CMM in the chassis. See Chassis Management Module
Replacement.
• Any situation where a CMM fails in a single CMM system or where both
CMMs fail in a dual CMM system. See Chassis Management Module Failure
or Removal.
• APSD on the 96-Channel Amplifier on page 23
APSD on the 96-Channel Amplifier
The 96-Channel Amplifier is capable of emitting high output powers. To guard against
accidental exposure to high-powered lasers, the 96-Channel Amplifier supports automatic
power shutdown (APSD). APSD shuts down the high output lasers in both directions
when a fiber cut is detected.
The output WDM signal on the line port is automatically shut down, or disabled from
turn-up, if either of the following conditions occurs:
• (Cond. 1) A Loss of Light fault is active against the input WDM and input OSC on the
same line port. This triggers the port to undertake APSD measures. The line port turns
off its output WDM signal and simultaneously sends a shutdown signal on the OSC to
the far end.
• (Cond. 2) A shutdown signal is received from the far end OSC. The far end OSC sends
a shutdown signal when APSD is triggered at the far end. In response to the shutdown
signal, the near end line port turns off its output WDM signal, and keeps it turned off
for as long as the shutdown signal persists.
Single Fiber-Cut Example
Starting with span fibers connected, and with the WDM and OSC operationally in-service,
the following sequence of events occurs after the receive fiber is cut on the line port:
1.
WDM and OSC Loss of Light Receive faults are raised on the near end line port. The
near end therefore meets
(Cond. 1) .
2.
The near end turns off its WDM output and sends an APSD shutdown signal on the
OSC to the far end.
23 Copyright © 2019, Juniper Networks, Inc.
Chapter 1: BTI7800 Series Safety Information