Loop Telecom Loop-V 4200 - Port Backup; Verifying Loop-V 4200 Operations

Chapter 3 Operation
3-12
Note:
When you are setting the Inband Management configuration (see section 5.3. System Setup,
System, Example 2, in this manual) a loopback timer will appear on your screen. If you are
planning to do any loopback testing while in the Inband Management (HDLC) mode you must
set the timer for a period (in seconds) suitable to your testing requirements. The inband
management function will be unavailable for the duration of the loopback testing. If you are not
planning to do any Loopback testing while in the Inband Management mode leave the timer at
its default setting of “0” seconds.
The purpose of the timer is to prevent the irretrievable loss of your inband management
line while doing loopback testing. When you are not in the inband management mode and
wish to do loopback testing you can ignore the timer.
3.20 Port Backup
The Loop-V 4200 supports a one-for-one port protection based on the send on two, listen on one protection
scheme. This allows protection of one port, and if one of the two ports are interrupted, the system
automatically sends an alarm and switches to the second port.
Send is to two different ports. Listen is from either of the two ports.
3.21 Verifying Loop-V 4200 Operations
The purpose of this section is not to help the user determine where a possible fault in the network may lie.
For this, the user needs to know the exact geometry of the network. Then standard network trouble shooting
procedures should be followed, which involve sectionalizing the network and performing loopback tests on
pieces of the network.
The purpose here is to help the user determine whether the Loop-V 4200 equipment is at fault after tests
have pointed a suspicious finger at this equipment. The procedures outlined here depends on test equipment
and other equipment the user may have on hand.
The organization of these procedures start from the simple to the complex. The procedure ends when a
definitive conclusion is made that the Loop-V 4200 equipment is at fault. To verify that the Loop-V 4200
equipment is not at fault, specialized equipment such as a BERT (bit error rate test) set is needed.