Specifications

Installation and Operation Manual Chapter 6 Troubleshooting and Diagnostics
IPmux-8/16 Ver. 6.00 Testing the Units 6-27
Internal Loopback
A TDM interface module can be set to an internal loop to test the connection
between the TDM port and the IP network. In this mode, data coming from the IP
network is both looped back to the IP network and transmitted forward to the
remote PBX connected to the TDM port (see
Figure 6-11).
IP Data
Remote IPmux-16
PBX
IP/Ethernet
Network
Figure 6-11. Internal Loopback

To run a loopback test:
1. From the Main menu, select Configuration.
The Configuration menu appears.
2. From the Configuration menu, select Physical Layer Configuration.
The Physical Layer Configuration menu appears.
3. From the Physical Layer Configuration menu, select a TDM module slot to
proceed to the E1, T1, E3, T3 or CT3 physical layer configuration:
 E1, T1 module – select the channel (1–4 or 1–8)
 E3, T3 module – the E3/T3 Physical Layer Configuration menu is displayed
immediately after selecting E3/T3 module slot.
 Channelized T3 – select CT3 EXT. from the Channelized T3 Physical Layer
Configuration menu.
4. From the E1/E3/T3/CT3 Physical Layer Configuration menu, select Loopback
State.
For T1 interfaces, select Loopback Configuration from the Physical Layer
Configuration menu, then select Loopback State.
5. Press the <Spacebar> to toggle between: Internal, External, Disable.
6. Press <Enter> when the desired loopback state value is displayed.
Selecting Disable disables a running loopback.
Activating T1 Inband Loopbacks
T1 physical loopbacks can be activated by receiving a loopback activation code
from TDM equipment connected to the T1 port. Loopback activation code is sent
on a whole T1 frame.
When loopback activation code is received, IPmux-8/16 activates external or
internal loopback, or transmits the code transparently to the remote TDM
equipment.