ADTRAN 4200659L3 Circuit And Network Failure Recovery Mode, Selection Path, Recommended Setting

Chapter 7. Circuit and Network Redundancy

Table 7-1. Configuration Requirements for Circuit Recovery

Selection Path	Recommended Setting
Config > Network Interface > XCV Threshold	1E-3 (see the following note)
Config > Network Interface > Network Protection	Disabled
Config > Network Interface > Max. Switch Threshold	3
Config > Network Interface > Min. Switching Period	10 seconds
Config > T1/E1 Interface > T1/E1 Circuit Protection	Enable all or select the
	T1/E1s that redundant
	switching should occur on.
Config > T1/E1 Interface > XCV Threshold	1E-3 (see the following note)

The XCV Threshold settings are based on the error rates considered acceptable on the STS-1 or DS-1 before switching.

CIRCUIT AND NETWORK FAILURE RECOVERY MODE

In this mode, two controller cards are installed and connected to two individual STS-1 lines. This is, of course, the most complete mode of redundancy. In this mode, the primary controller card is connected to the primary STS-1 line and the secondary controller card is connected to the secondary STS-1 line. The primary card and line actively transmit data, while the other card and line stand by ready to take over if the first card and line fail. For example, if CARD A fails, then control switches to CARD B and NET B.

An important feature of the MX2800 STS-1 is its ability to internally re-route the network connection if a controller card and the opposite network connection fail. For example, in the illustration given in Figure 7-3, failed NET A is connected to healthy CARD A; and healthy NET B is connected to failed CARD B.

7-4 MX2800 STS-1 User Manual 61200659L1-1