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AirMux-104 Installation and Operation Manual 
Chapter 5  Diagnostics and Troubleshooting 
 
Running Diagnostic Loopbacks 
5-5 
Local External Loopback 
Local AirMux-104 can be set to an external loopback to test the local E1 port and 
its connection to the local side user equipment. In this mode, data coming from 
the local user equipment is looped back to it (see 
). This loopback is 
initiated from a management station connected to the local unit. 
Testing 
Equipment 
Management 
Station
E1 
Interface
Local RT
 
Figure 5-5.  Local External Loopback 
Remote Internal Loopback 
Remote AirMux-104 can be set to an internal loopback to test connection 
between the local and remote units, the local E1 port and its connection to the 
local side user equipment. In this mode, data coming from the local AirMux-104 is 
looped back to it (see 
). This loopback is initiated from a management 
station connected to the local unit. 
Management 
Station
E1 
Interface
E1 
Interface
Testing 
Equipment
Remote RT
Local RT
 
Figure 5-6.  Remote Internal Loopback