[App_rpt] Radio Interface Question

[Steve Rodgers]

Please see answers and suggestions below

Steve.


On Thursday 23 February 2006 15:10, James Harfield wrote:
> I am looking for some advice to move in the right direction in
> connecting a base station I have to the Quad PCI Radio Card.  According
> to Asterisk and the zaptel.conf the interface type is E&M and looking at
> the diagram in the installation pdf it appears to be a 2 wire operation
> type. 

That assumption isn't correct. It is E&M for zaptel configuration only (not in 
hardware). The card interface 4 wire audio even though only a single Zap 
channel is specified.  In zaptel.conf you should specify:

e&m = 1
....

And in zapata.conf you should specify:

signalling=em_txrx
channel = 1
....

And in rpt.conf you should specify only ONE zap channel:

[100]                          ; Name of First Repeater

rxchannel = Zap/1                      ; Rx audio/signalling channel
...



> I reconfigured an RJ-45 to connect between the base station and 
> PCI Card, with corresponding PTT / COR / TX / RX / GND pins in the
> correct location on each side.  However, I am unable to connect to the
> base station and am given the: Unable to create channel type Zap, error.

Please elaborate on how you are trying to connect. When do you get the "Unable 
to create channel Zap" error? Was it when you tried to run Asterisk with 
app_rpt compiled in?


>
> My concern is that the connection is not a true E&M and the system
> cannot provide the -48v off hook and other levels required to recognize
> this channel.

Your concern is true. It isn't true E&M at the hardware level. COR is a input 
which accepts voltages from 0 to 13.8V and PTT is an open drain output from a 
power MOSFET. See the quadradio_pci_installation.pdf file on app-rpt.qrvc.com 
for more information on how to interface to the board.

As stated above, It is E&M only at the software configuration level.

Hooking the signals of the Quad Radio Card to a real E&M interface could 
damage the board as -48V exceeds the component ratings of the parts in the 
input and output circuits. Hopefully you didn't do this?!

>
> We have checked ztcfg -vv and it returns:
> Channel 01: E & M (Default)
> 1 Channels configured
>
> Modprobe goes off successfully, et all.  Would anyone be able to offer
> any insight to move me in the correct direction?
>
> Thank you,
>
> JRH
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