8000A Datasheet, PDF (15/19 Pages) Emcore Corporation – System 8000 Fiber-Optic Interfacility Links

Data Sheet, Rev. 0
March 6, 2003
System 8000 Fiber-Optic Interfacility Links
System 8000 Redundancy
System 8000 provides multiple redundancy options.
The standard offerings are single thread, 1:1, and 1:2.
The 1:1 and 1:2 configurations offer two modes of
redundancy switching: automatic and manual.
Automatic Mode
In this mode, internal sensing and control provides
automatic switching to the backup link in case of any
failure in the optical system. If the laser temperature
alarm or laser optical power alarm is detected at the
fiber-optic transmitter, the faulty transmitter is shut off.
In the 1:2 redundancy scheme, if these conditions are
detected, the switch position is changed to select the
backup link. The fiber-optic receiver then detects loss
of received optical power and the output is switched to
the backup link. If the fiber-optic cable containing the
fiber for the primary link is broken, the fiber-optic
receiver detects loss of received optical power and the
output is switched to the other channel. The switching
due to receiver failure works independently of the
external monitoring and control (M and C) system only
for the 1:1 configuration. For the 1:2 version, the exter-
nal M and C must switch the input to the backup trans-
mitter.
Manual Mode
When this mode is selected, automatic switching to the
backup link is turned off. This mode can be selected
remotely through the M and C system or it can be
selected locally by pressing the auto-off button on the
front panel of the status and control plug-in on the
chassis.
Figure 1. System 8000 Redundancy Mode Configurations
ORTEL a Division of EMCORE
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