multy use cat5 FREE cabling and networking Helpdesk
 Question by Rob Berryman posted 23 Mar 2004
 multy use cat5
Im having trouble explaining why it is not to standard to use the same cat5 cable to run a computer and phone(using the the transmit and recieve for computer and the other two that are dead for phone)in a residental or commertial enviorment.
 Answer by Dmitri Abaimov posted 24 Mar 2004
Dear Rob,

The simplest reason for not allowing sharing a cable between applications is that applications change (much) faster that cabling system that's inside the walls. The trend is to go for more speed all the time, and that requires more pairs for simultaneous multiple channel data transmission as in 1000BASE-T Gigabit Ethernet. We do have enough customers today who wish they did not insist on splitting those cables because they are practically banned from deploying Gigabit Ethernet or they have to sacrifice phone, which is not always possible. In the nearest future more apps like Gigabit Ethernet may come up, and the need for all four pairs will be even stronger.

There are also quite a few older apps that require three or all four pairs just because the interface requires more signals for communication, such as RS 232.

Dmitri Abaimov, RCDD

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