I have a Fiber line that goes in between buildings at my office. On each end there is a TrendNet Fiber Media Converter. On each of those converters there is a CAT5 cable going into a switch. On both sides the lights are on on the switch and all the lights are on on the Media Converter, but I have no signal, apparently. The reason that I say this is none of the computers are reaching any other machines on campus (not even DHCP server) and my VoIP phones in that building have no signal either. My question is mainly, how do I test this equipment to see if my problem is the converter vs. something strange happened with the Fiber?