atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring Long Cable run

Giddy up.

I've used products similar to the Versatek product named above. They work very well as advertised. Had a customer who had an existing OPE to his shed coming off of his house and wanted to share his DSL connection in his shop from the house. Plugged in an ethernet switch at the house and one of these HPNA devices on each end, and worked like a charm. No programming, just plugin and go.

I just did the same thing. We had a 25 pair PE39 cable between the locations for telephone extensions. We used this on one pair. Worked like a charm and even has a built in switch.

-Hal

In the days before DSL, one local hospital used to run RS232 data on dark circuit pairs. I think their longest run was 10500 cable feet, but they were only pushing 14.4 kbs over the pair with flow control. Sure beat paying the phone company for ISDN or leased lines.

The 100m distance is the result not of how long the connection can be, but instead is a factor of how long it takes for a packet to be detected by a device on the other end of the cable for collision avoidance purposes. If the link you are trying to run will tollerate a high error/collision rate, then you could go farther than the 100m limit. It probably just wouldn't certify.

In addition to the putting a switch in the middle you could even power that switch over the unused pairs in the 100mBit cable. You would probably need to use both pairs to get the current and voltage you need out to the switch, but a switch in a bucket is nothing new. Though I'd want to test it before selling it to a customer. All you would need is a couple partial boxes to test with.

IP, X.25, Frame Relay, ATM and other packetized voice/data techniques were designed to handle communciations problems during enormous disasters. Though flexable, those techniques aren't necessarily suitable when speed is concerned.

That's why a file transfer with a 56K modem (using Z-Modem protocol) is far, far faster at transferring a file compared to the same transfer using IP over a 56K dedicated circuit.

I'd be interested in knowing what end-to-end communications problem it is that you're trying to solve.

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