The maximum supported cable length is directly related to the speed of transmission; the slower the data, the longer the maximimum length.
I'm pretty sure the textbook answer is going to be 50 feet @9600 baud; which is defined in the RS-232 spec. However, your milage may very. If there's a lot of interfence, this length may go down. If evironmental factors are good, the length may go up.
The Unity group has not done any testing on cable length, and there might be other requirements from the PBX. But I think the "safe" answer is 50 feet. Anybody else out there have success with longer distances?
Black Box sells an RS232 signal extender called Miniture Async Short Range Modem (SRM-5A) (made by RAD) that will extend an RS232 signal out to 2-3 miles at 9600 baud on 24 AWG copper wire. I'm using these extenders on my SMDI link on a Nortel SL-100. My guess is that they would work in your application. The Black Box part number is ME749A-M or ME749A-F (male or female).
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...