Modem User's Guide
Table Of Contents
- Contents
- Warranty, Sales, and Service Information
- About This Guide
- About the Model 7986 Standalone Termination Unit
- Using the Asynchronous Terminal Interface
- Initial Startup and Configuration
- Monitoring the Unit
- Testing
- Messages and Troubleshooting
- Security
- IP Addressing
- Configuration Option Tables
- Standards Compliance for SNMP Traps
- Cables and Pin Assignments
- Technical Specifications
- Glossary
- Index
Testing
5-3
7986-A2-GB20-00
September 1998
Line Loopback
Line Loopback (LLB) loops the received signal on the network interface back to
the network without change.
CAP
DSL
Port
G.703
Port
CAP E1
LIU
FramerFramerTransceiver
AIS
98-15997
" Procedure
To run a Line Loopback:
1. Position the cursor at the Start command next to Line Loopback on the
Network Tests screen.
2. Press Enter.
The Start command is changed to Stop.
3. To manually stop the test, verify that the cursor is positioned at the Stop
command.
4. Press Enter.
Line Loopback cannot be started when a Repeater Loopback, DTE Loopback,
Remote DCLB, or network-initiated Line Loopback is in progress.