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Section 3, Configuration MX2800 M13 Multiplexer User Manual
XCV Threshold
Excessive code violations (XVC) Threshold sets a limit on CVs accepted by the unit before it switches
controller cards. If set to Disabled, code violations will not cause the unit to switch controller cards. The
threshold limits are described in Table 3-1.
Protection Configuration
The MX2800 houses two controller cards for 1:1 protection against hardware failure. The two cards can
also provide network protection, supporting two T3 circuits simultaneously. The selections in this menu
allow customizing the unit’s protection setup.
Active Controller
This field displays A or B, indicating the active controller card. This setting can be used to force the
controller cards to switch. For example, if controller card A is active and B is selected, a switch-over
occurs immediately.
Network Protection
This field enables or disables the unit’s ability to automatically route information to the backup T3 in the
event of a primary T3 failure. If enabled, all information is automatically routed to the backup T3. If
disabled, the stand-by controller protects against failures of the active controller.
Maximum Switch Threshold
The value entered in this field determines the number of times per hour the unit is allowed to switch
between controller cards. If, in an hour, the cards switch more than the Maximum Number of Switches, the
unit issues a trap and stops switching cards for the next 24 hours. Refer to Trap Descriptions on page 3-22.
The default setting is three times an hour. This count may be cleared by clearing
Protection Switch alarm
counts. See Figure 5-13 on page 5-14.
Min. Switching Period
After the unit switches controller cards, the number of seconds entered in this field must pass before
another card switch will be allowed. The default setting is 10 seconds.
Table 3-1. XCV Threshold Limits
Setting The unit switches controller cards if...
1E
-3
More than one out of every 1,000 bits received on the DS3 contains a code violation
1E
-4
More than one out of every 10,000 bits received on the DS3 contains a code violation
1E
-5
More than one out of every 100,000 bits received on the DS3 contains a code violation
1E
-6
More than one out of every 1,000,000 bits received on the DS3 contains a code violation