CANOGA PERKINS 3240S SNMP Managed Fiber Optic Multiplexer - Manual (Page 37)

3240S F I B E R O P T I C M U L T I P L E X E R
3240S Fiber Optic Multiplexer
• REDUNDANT OPTICS Switch - The 3240S system operating mode is set with the three-position (PRI/AUTO/SEC)
Redundant Optics switch (also referred to as the Manual/Automatic Switch over Switch). The PRI and SEC positions
force manual operation on the Primary and Secondary Links, respectively. These modes are used for maintenance and
resetting alarms. The middle position (AUTO) is the Automatic Mode and is the normal operating mode.
This switch can also be controlled via the NMS. This switch must be set to the AUTO position if it is being controlled
by the NMS.
• PRIMARY OPTIC PWR - This switch changes the launch power of the output transmitter of the primary optic link. When
using an optical link with more than 6db, this switch should be set to HI.
• SECONDARY OPTIC PWR - This switch changes the launch power of output transmitter of the secondary optic link.
When using an optical link with more than 6db, this switch should be set to HI.
The PRIMARY OPTIC PWR and SECONDARY OPTIC PWR Switches are not installed on all 3240S
multiplexers. These switches will only be present when the optical transmitter is a high power laser.
2.5.6 System and I/O Port Loopbacks
The quickest system check that may identify a problem will be a loopback. There are two types of loopback exercised by
the 3240S: System Loopback, local and remote, and I/O Port Loopback, local and remote. System loopback modes affect all
of the data channels. I/O port loopbacks affect only one channel or a group of channels, depending on the type of I/O
Card installed. The loopback switches are used for diagnosing a system problem in the event some or all channels are not
functional. Both System and I/O Port Loopbacks can be set or removed via the NMS as covered in Section 4, Manage-
ment Operation.
The NMS can control the Test Switch functions in parallel with manual switch activation. The automatic
and manual operation can conflict with each other. For example, if the NMS has selected the Remote
System Test Mode, the manual switch cannot override this selection. When the switches are being
manually operated, the NMS must leave the switches set to normal settings (NOR). Similarly, when the
NMS is in control, the switches must be left in the normal positions.
Use of Loopback switches will interrupt data transmission and should not be used during
normal operation.
The loopbacks can be used to isolate a problem in either the local-end multiplexer, remote-end multiplexer, specific I/O card,
or fiber optic cable. The loopback switches provide the operator with an effective troubleshooting tool for narrowing down
a problem in the system. Reference Figure 2-12 for System and I/O Port Loopback switches.
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