Cisco Systems IPMUX-1E operation manual Diagnostic Tests, E1/T1, External Loop, Internal Loop

IPmux-1/1EInstallation and Operation Manual Chapter 4 Troubleshooting and Diagnostics

4.4 Diagnostic Tests

Maintenance capabilities include external and internal loopbacks.

E1/T1

External Loop

IPmux-1 can be set to an external loop to test the connection between the E1/T1 port and the PBX (refer to IPmux-1 E1/T1 Configuration in Appendix E). In this mode, data coming from the PBX is both looped back to the PBX and transmitted forward to the IP network (see Figure 4-5).

This mode can also be achieved by a T1 FDL line loopback command.

PBX IPmux-1

Figure 4-5. IPmux-1 External Loop

Internal Loop

The E1/T1 module can be set to an internal loop to test the connection between the E1/T1 port and the IP network (refer to IPmux-1 E1/T1 Configuration in Appendix E). In this mode (E1/T1 only), data coming from the IP network is both looped back to the IP network and an AIS pattern is transmitted forward to the PBX connected to the E1/T1 port (see Figure 4-6).

				AIS IPmux-1
		PBX
			Figure 4-6. IPmux-1 Internal Loop
	To run a loopback test:
Main Menu	• Press the <Spacebar> on your keyboard to toggle between the values:

↓Internal/External /Disable.

2.Configuration

	↓	−	Internal: Data received from the IP network side is looped back to the
2.	E1/T1		network transmit line. An unframed all ‘1’ code (AIS) is transmitted in the
Configuration			E1 Tx path toward the PBX. Incoming data from the PBX is ignored.
	↓
3.	Loopback	−	External: Data received from the PBX at the receive E1 line is looped back
State			to the E1 Tx path (toward the same PBX), and continues its way to the

IP network. Data coming from the IP network is ignored.

−Disable: No loopback. Regular operation. Default value: Disable

Diagnostic Tests 4-25