Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
3.1.7.4 Shelf Alerts.
As a reminder to the user, multiplexer shelf is in ALERT state whenever anything in the redundant-
mode control system is not in its normal operating state:
• Standby Module active (either automatically or forced)
• Front-panel mode slider switch not in AUTO position
• Forced-switch configuration parameter SWITCH not equal to AUTO
3.1.7.5 Swap Delay.
The swap control process is delayed by a SWAP-DELAY period, as described in paragraph 3.1.3.2,
above. Longer delays provide the system with greater immunity against false swaps caused by
persistent DS1 line disturbances.
This delay value can be set through the front panel display, using the SWAP function. The allowed
settings are 0.6, 1.2, 2.4, 4.8, 9.6 and 19 seconds. Refer to Table 2-8 and Figure 2-22.
Similar settings can be selected in NMS.
3.1.7.6 Maintaining Configuration: Module Insertion Process.
If proper operational procedures are observed, Common Modules can be removed and replaced
without loss of configuration information.
3.1.7.6.1 PROCEDURE TO REPLACE A REDUNDANT COMMON MODULE.
• Ascertain that the shelf is operational with the currently ACTIVE module.
• Remove the INACTIVE Redundant Common Module.
• If a Standby Module is being replaced, preset the Redundant Mode slider switch to MAIN on the
replacement. This will prevent erroneous takeover by the replacement upon insertion.
• If a Main Module is being replaced, Standby is going to remain active by definition (no automatic
swap to Main). Front panel slider switch is non-functional on Main Module; leave it in AUTO
position for consistency.
• Insert replacement.
• Observe CONFIGURED indicator next to the alphanumeric display on the replacement. Once
indicator lights up, Common Module and Channel Modules configuration was copied successfully.
• The inactive module can be made active, if needed.
• Confirm that all settings are as desired for automatic protection: position of front-panel slider
switch and configuration parameters (interrogate configuration through front-panel display or using
NMS).
Note that if the active module is subsequently reconfigured, changes may not get copied into the
inactive module for up to 20 seconds. Therefore, inactive module should not be activated for 20
seconds after any configuration changes.
The above procedure pertains to TERM as well as both DI-A and DI-B Redundant Common Modules.
IMUX 2000E1 RFL Electronics Inc.
January 23, 2004 3-13 (973) 334-3100
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