Testing Interfaces

Testing interfaces allows you to troubleshoot problems and to check the quality of links at various layers in the interface stack. The router supports the following test options:

• Transmission of BERT patterns to remote devices
• Local loopback—Loops the data back toward the router; on supported line modules, also sends an alarm indication signal (AIS) out toward the network
• Network loopback—Loops the data toward the network before the data reaches the frame
• Payload loopback—Loops the data toward the network after the framer processes the data
• Remote loopback—Provides the ability to:
  • Request that remote devices enter into loopback
  • Be placed in loopback by remote devices