Black Box LRU4240 manual Loop Payload Test, Loop Up Remote and Loop Down Remote Tests

Dual Trunk E1 Router

LOCAL	REMOTE
Dual Trunk E1 Router	Dual Trunk E1 Router

DSU	CSU
Data
Port

		E1
Network	WAN	Network
Interface		Interface
	E1

CSU DSU

Figure 8-1 Loop NET Test

Loop Payload Test

The Loop Payload test verifies proper operation of the unit and the network.

This test loops the payload data received from the network back toward the network. Before it is looped back, the data is regenerated and a new framing pattern is inserted. Thus, the proper E1 framing of the Dual Trunk E1 Router and network can be verified.

This test can loop Net1, Net2, and All Nets.

Loop Up Remote and Loop Down Remote Tests

The Loop Up/Down Remote test, illustrated in Figure 8-2 on page 8-68, places the remote unit into Network Loopback using the industry standard set codes. Once in Network Loopback, test patterns can be sent to verify the Bit Error Rate (BER) performance of the bi-directional E1 network signal.

To place the remote unit into network loopback, the local Dual Trunk E1 Router continuously transmits the industry standard loop up code to the remote unit. If the remote unit does not go into network loopback within 15 seconds a failure is declared and the Dual Trunk E1 Router stops sending the loop up code.

The loop code and network parameters for the local and remote units must match.

Use the Loop Down Remote test to terminate the remote loopback. This test can be used no matter how the remote unit was put into loopback.

Perform the Loop Up Remote and Loop Down Remote tests from the front panel, user interface or SNMP.

This test can loop Net1 and Net2, but not All Nets.

Dual Trunk E1 Router User’s Guide TECHNICAL: 0118 96 56 000 67