Length of Cable for voice 5

[telcomwork]

I understadn data has a lmitation of 328 feet before attenuation is a factor on Cat5. Does this hold true for voice as well? How long of a cable run can you have before you start having isssues.

Thanks You!

 

[TouchToneTommy]

Depends on the type of telephone (Single Line, Digital Multiline, IP, etc), and the type of card it is connected to (Digital Station, S/L Tip/Ring, S/L OPX, etc.)

You will need to consult your documentation for your phone switch.

 

[orypecos]

I aggree with Touchtonetommy. It depends on the size of wire too. Generally with pbx the larger the wire, the less resistance, so the longer the run possible. Digital phones and data usually require shorter runs because you are working with square waves that represent higher frequences that degrad faster than lower frequences.

 

[telcomwork]

Thanks all!

 

[orypecos]

There are all kinds of other parameters too, but they don't usually come into use. They are listed for the G3R in book
Maintenance for R9r 555-233-117
Issue 2
November 2000
Maintenance Architecture
1-Protocols 47
1
ERL and SFRL Talking State
Echo-Return Loss (ERL) and Single-Frequency Return Loss (SFRL) performance
is usually dominated by termination and/or loop input impedances. The system
provides an acceptable level of echo performance if the ERL and SFRL are met.
Peak Noise Level
n Analog to analog — 20 dBrnC (decibels above reference noise with
C-filter)
n Analog to digital — 19 dBrnC
n Digital to analog — 13 dBrnC
Echo Path Delay
n Analog port to analog port — < 3 ms
n Digital interface port to digital interface port — < 2 ms
Station-to-station ERL should meet or exceed 18 dB SFRL
should meet or exceed 12 dB
Station to 4-wire trunk connection ERL should meet or exceed 24 dB SFRL
should meet or exceed 14 dB
Station to 2-wire trunk connection ERL should meet or exceed 18 dB SFRL
should meet or exceed 12 dB
4-wire to 4-wire trunk connection ERL should meet or exceed 27 dB SFRL
should meet or exceed 20 dB

 

[phonesrus]

Attenuation is not the factor on cat 5 cable, Data packet timing is the issue there. Collisions occur because you are attempting to transmit and receive at the same time. Voice on the other hand, has to do with the DC resistance of the cable as determined by cable guage, loop length, DC voltage and loop current supplied. Depending on the PBX, Digital stations can run to 3000-3500 cable feet; Analog can reach 5-6000 feet

 

[jfh9219]

From the Callmaster II & III Installation and Usage Guide:

In 4-wire mode, with 22-gauge or 24-gauge wire, the distance
between the CALLMASTER II or CALLMASTER III and the PBX
should not exceed 5,000 feet; with 26-gauge wire, the distance should not exceed 4,000 feet.

In 2-wire mode, which is applicable only to the CALLMASTER III, with 22-gauge wire, the distance between the CALLMASTER III and the PBX should not exceed 5,500 feet;
with 24-gauge wire, the distance should not exceed 3,500 feet; with 26-gauge wire, the distance should not exceed 2,200 feet.

I think you will find this is consistent for most Avaya digital/analog sets. IP phones must adhere to Cat5 limitations.

 

[RTMCKEE]

what jfh9219 said. I dont have any document links but it was always generally assumed you could run 2000 feet on a voice line. (extension off the definity.)

The Cat5 spec you mentioned is just for the "station run" if you will. From the telco closet to the station. Keep in mind that the spec also calls for another 800m of copper from the telco equipment to the telephone closet. so thats ~2500' PLUS the 328' for the station run.

RTMCKEE

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