Specifications

Installation and Operation Manual Chapter 5 Monitoring and Diagnostics
Optimux-108 Ver. 6.1 Performing Diagnostic Tests 5-15
Running Uplink Loopbacks
Local Loopback on the Uplink
The uplink local loopback returns the transmit signal of the active uplink interface
to the input of the receive path. Simultaneously, the local Optimux-108 sends an
unframed all-ones signal to the uplink.
Figure 5-13 shows the uplink local loopback connection for the Optimux-108
without optional V.35 or Ethernet user port. The diagrams for models with
optional user ports are similar but do not include AIS on the uplink.
When this loopback is activated, the equipment connected to the local
Optimux-108 tributary must receive its own transmission.
This test checks the operation of the local Optimux-108 and the connections to
the equipment attached to the tributary interfaces.
Tributary Interface
Tributary Interface
Tributary Interface
Tributary Interface
Local Optimux-108
Mux /Demux Uplink Interface
~
AIS
Figure 5-13 Uplink Local Loopback in the Optimux-108
Uplink Remote Loopback in Optimux-108
The LINK remote loopback returns the received signal of the active uplink
interface to the input of the transmit path. Simultaneously, the remote
Optimux-108 sends an unframed all-ones signal to the input of the uplink Demux.
For V.35 interface version: when performing Uplink RLB, V.35 data on the remote
Optimux-108 is not looped
Figure 5-14 shows the uplink remote loopback connection for the Optimux-108
without optional V.35 or Ethernet user port. The diagrams for models with
optional user ports are similar but don’t include AIS on the uplink.
This test checks the operation of the local Optimux-108 and the connection to
the remote Optimux-108.
Note