Chapter 6 R2MFC MBM maintenance 63
Diagnostic tools
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 Table 10 for a description of the diagnostic and loopback modes.
Table 10 Diagnostic and loopback modes
Mode | Description | Call |
|
| Availability |
|
|
|
Diagnostic Mode 1 | Routes the E1 transmit signal from the BCM through the | Available to |
| R2MFC MBM out to the bantam jack. | process calls |
|
|
|
Diagnostic Mode 2 | Routes the E1 transmit signal from the CO through the | Available to |
| R2MFC MBM out to the bantam jack. | process calls |
|
|
|
Diagnostic Mode 3 | Routes the E1 received signal from the BCM out to the | Available to |
| bantam jack without any interaction with the R2MFC MBM. | process calls |
|
|
|
Loopback mode 1 | Routes the E1 signal received from the CO back out to the CO | Not available to |
(continuity mode) | without any interaction with the R2MFC MBM. | process calls |
|
| |
|
|
|
Loopback mode 2 | Routes the E1 tranmitted signal from the BCM through the | Not available to |
(card edge loopback) | R2MFC MBM and back to the BCM. | process calls |
|
|
|
Setting the R2MFC MBM to diagnostic mode
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:
1Set the Config DIP switches to the desired diagnostic or loopback mode while the R2MFC MBM is still powered up. See See Appendix B, “Diagnostic and loopback DIP switch settings,” on page 109.
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.
2Perform desired testing.
3Reset 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.
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.
