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Thanks for all the info guys, I'll be trying a number of combination's this week and will let you know what i find. I've got a replacement gbic and have tried replacing 1 of the units over the weekend but it happened again. I'll try replacing the other gbic and if it happens again i'll try a different port. (I'd think if it was the port there would be something in the error log. on the Cisco unit) 
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Thanks for all the info guys, I'll be trying a number of combination's this week and will let you know what i find. I've got a replacement gbic and have tried replacing 1 of the units over the weekend but it happened again. I'll try replacing the other gbic and if it happens again i'll try a different port. (I'd think if it was the port there would be something in the error log. on the Cisco unit)

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ended up being the line. The gbics where fine.
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ended up being the line. The gbics where fine.

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We have two Cisco 3560G switches and are running &nbsp;cat-5 between them using the gbic ports (using the plug in adapters). At night the gbic's have been going down, acting like nothing is plugged into them. If i unplug the cables and plug them back in it comes up. It has never gone down during the day with high activity. <br />
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Any info or expertise on this would be greatly appreciated. There are no error or warning logs on the cisco's.
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We have two Cisco 3560G switches and are running  cat-5 between them using the gbic ports (using the plug in adapters). At night the gbic's have been going down, acting like nothing is plugged into them. If i unplug the cables and plug them back in it comes up. It has never gone down during the day with high activity. 

Any info or expertise on this would be greatly appreciated. There are no error or warning logs on the cisco's.

Cisco 3560G GBIC port problem

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.