11 Appendix Installation Awareness; Short Circuit On Ring Side Of Digital Line; How To Avoid A Short Circuit Condition - Nortel Meridian SuperNode SL-100 Reference Manual

11 Appendix Installation awareness

This chapter describes a possible over-voltage condition that would most
likely occur during installation and cutover of the IPE. However, care should
also be taken during routine maintenance functions to prevent this situation.

Short circuit on ring side of digital line

If a short circuit condition occurs on the ring side of the digital line, the power
converter on the Intelligent Peripheral Equipment (IPE) resets. The reset of
the power converter is an FCC and UL safety protection requirement.
The short circuit condition shuts down the power converter to the IPE module
and require a peripheral download. Please note that, although the reload
process takes only a few minutes, the IPE audit performed every 10 minutes
could cause a total of 15 minutes downtime from the time of discovery to the
time of completed reload.

How to avoid a short circuit condition

To avoid a short circuit condition, care should be used when using punch down
and wire wrapping tools. These tools should be insulated to prevent accidental
shorting of the ring side of the digital line. Additionally, jumpers should be
pulled off of the main distribution frame before troubleshooting in the feeder
closets.
Meridian SuperNode MSL-100 Intelligent Peripheral Equipment (IPE) Reference Manual MSL14
Appendix B 11-1