T1 CrossConnect Installation & Operation Manual
4 – Mapping Basics
Version 2
4-14
GatesAir
Intraplex Products
Figure 4-14. IntraGuide Map 3 for Point-to-point Protection Switching
4.9 Error Detection and Switching
The DCS constantly monitors its network paths for these errors:
●
Loss of frame
●
Loss of data
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All ones signal
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Bit error rate exceeded
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Remote alarm
Any error can cause an alarm condition and a corresponding map switch, but only if each alarm
condition has been enabled by the user in ISiCL or IntraGuide. In addition, any combination of the T1
paths can be unused. In this case, the user must disable the unused ports. A failure in a path does not
cause a change in operation or an alarm if the port for that path has been disabled.
Before switching, the DCS waits a selected time. If the error is removed during this period, the DCS
does not switch.
Switch time delay
is the amount of time that the DCS takes to switch over to the map
assigned to a specific port failure. Section 5.3.4 –
Settings Review and Change
gives a review of the
IntraGuide setting for switch time delay.
When the DCS discovers that a port has failed, it starts the switch delay timer. The DCS does not
switch over to the new map until the switch delay time expires. The default setting is 100
milliseconds. Figure 5-8 shows this setting in the Configuration View of IntraGuide.
Summary of Contents for Intraplex T1 DCS-9530 CrossConnect System
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