Howto:Maximum wire length
Applies To
This information applies to
- IP21, IP22, IP24, IP28, IP2000, IP6000, IP3000
More Information
IP21
The maximum wire length is determined by the wires resistance. It is limited to 2x30 Ohm.
Here is the maximum line length as a function of the cable's diameter
Cable diameter (mm) | Maximium wire length (m) |
---|---|
0,4 | 200 |
0,6 | 450 |
0,8 | 800 |
Note that long cables running in parallel may cause interferences between the ports
IP22, IP24, IP28
These devices can operate 3 standards phones per port simultaneously. The maximum wire length (0.6mm diameter assumed) is 170m then. If there is only one phone connected per port, the maximum is 1700m. This is for talking. Ringing requires much higher voltage and depends heavily on the type of phone used. The maximum linelength thus can be less.
PRI
Maximum 300 meters is supported on ISDN Pri cable, up to 600 meters are possible, from 6000 to 1000 meters a third party adapter (for refreshing the Isdn signalling) can be necessary - never use over 1000 meter.