Specifications

Chapter 5 Monitoring and Diagnostics Installation and Operation Manual

5-16 Performing Diagnostic Tests Optimux-108 Ver. 6.1

Tributary Interface

Local Optimux-108

Uplink Interface

AIS

Uplink Interface

Remote Optimux-108

Tributary Interface

Mux /Demux Mux /Demux

Tributary Interface

Figure

5-14. Uplink Remote Loopback in the Optimux-108

³ To run a loopback on an uplink:

1. Set Device Number to the device being configured (Local or Remote).

2. Set the uplink LLB loop timeout to the number of minutes the loopback must

run (1 to 255).

3. Set uplink Loop type to the type of loop to run on this device (LLB or RLB).

The loopback test begins running immediately after the loopback is set.

Setting the Uplink Local Loopback (LLB) in the remote Optimux-108 disconnects

the link, and as such, is irreversible. To remove this loopback, connect a terminal

to the remote unit or shut down the power to the remote unit. If you set the

Uplink LLB timeout on the remote Optimux-108, the loopback test will stop after

the specified timeout period.

Running Loopbacks on E1 Tributary Channels

Optimux-108 features local and remote loopbacks on each E1 tributary link. The

loopback is set separately for each E1 interface.

E1 Tributary Local Loopback

The E1 local loopback returns the E1 transmit signal to the output of the receive

path. Simultaneously, an unframed all-ones signal is sent to the MUX.

Figure

5-15

shows the E1 local loopback connection.

This test checks the operation of the connections to the equipment attached to

the local tributary interfaces.

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