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NBX V3000 Flashing Red Lights - What does this mean

We have an older 3Com NBX V3000 Analog phone system and today, we've been having some issues where the user inside the office can hear the caller just fine, but the caller outside the office is unable to hear due to static and/or choppiness.  I noticed that the 3Com V3000 had a flashing red line next to the Ethernet port (see picture)User generated image.

Any help would be appreciated.  If it helps, we have some old 30 networking switches that need to be replaced as well.
IP TelephonyTelecommunicationsNetworking Hardware-Other

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sscal
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David
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The online manual states: ...
 Red Alarm — Indicates one of these conditions:
■ Loss of Signal (LOS)
■ Loss of Framing (LOF) also known as Out of Frame (OOF)

-- So check cabling.
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ASKER

Thanks.  We swapped out a couple of network switches this morning, but that didn't improve anything.  I'll swap out the cable this evening or tomorrow morning when no one is in the office.
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sscal
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ASKER

I'm not a networking or a telephony guy.  What should I be looking for in the configuration?  Is it possible the Ethernet card on the NBX V3000 is failing?
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ASKER

We had an outside vendor come by and they confirmed it was a cabling issue, as you had suggestion.

Sorry fro the delay in closing this.
Networking Hardware-Other
Networking Hardware-Other

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.

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