Nortel Networks R2MFC Manual De Usuario

Chapter 6 R2MFC MBM maintenance 63

R2MFC Media Bay Module Installation and Configuration Guide

The R2MFC MBM has three diagnostic settings and two loopback settings available to help with 
the troubleshooting process. When the R2MFC MBM is running in diagnostic or loopback mode, 
the signals from the BCM to the CO, or from the CO to the BCM, can be intercepted by placing 
diagnostic equipment in the bantam jacks on the front of the R2MFC MBM. This allows the 
external MFCR2 link, or the internal E1, to be checked for communication errors. The signal can 
be traced from start to finish, helping to determine the source of the errors. 

See 

 for a description of the diagnostic and loopback modes. 

The R2MFC MBM is placed in diagnostic or loopback modes by setting the Config DIP switches 
in either the diagnostic or loopback position. Perform the following steps to set the R2MFC MBM 
into either diagnostic or loopback mode:

1 Set the Config DIP switches to the desired diagnostic or loopback mode while the R2MFC 

MBM is still powered up. See 

The selected diagnostic or loopback mode becomes active five seconds after the last DIP 
switch change. The last country configuration stays in effect until a restart occurs.

2 Perform desired testing.

3 Reset the DIP switches back to the appropriate country code after testing has been completed 

so that the correct country code is read upon a restart.

Table 10   Diagnostic and loopback modes

Diagnostic Mode 1

Routes the E1 transmit signal from the BCM through the 

R2MFC MBM out to the bantam jack.

Available to 

process calls

Diagnostic Mode 2

Routes the E1 transmit signal from the CO through the 

R2MFC MBM out to the bantam jack.

Available to 

process calls

Diagnostic Mode 3 

Routes the E1 received signal from the BCM out to the 

bantam jack without any interaction with the R2MFC MBM.

Available to 

process calls

Loopback mode 1
(continuity mode)

Routes the E1 signal received from the CO back out to the CO 

without any interaction with the R2MFC MBM.

Not available to 

process calls

Loopback mode 2
(card edge loopback)

Routes the E1 tranmitted signal from the BCM through the 

R2MFC MBM and back to the BCM.

Not available to 

process calls

Warning: Restarting the R2MFC MBM, while the Config DIP switches 
are in a diagnostic or loopback mode, causes the R2MFC MBM to start 
up in the diagnostic or loopback mode with the default country setting of 
Mexico config 1.