Troubleshooting LMR on a Cisco router using Tones

[kcarpenter]

From the LMR router, perform these strings:

To force a PTT closure to the Radio:

Router# test voice port #/#/# e-lead relay on

To normalize the e-lead:

Router# test voice port #/#/# e-lead relay disable

Note-the E-lead statement needs to be on the Voice-port. If it’s not, disregard this command. If e-lead is set. You may want to take it off because you’re interfacing to a tone based radio – the tones are responsible for keying the radio and not the e-lead.

To send a tone towards the radio:

Router# test voice port #/#/# inject-tone local {choose a frequency you wish to inject}

To disable the tone:

Router# test voice port #/#/# inject-tone local disable

Note-If you find out that the radio requires an E/M (PTT) closure too, you need to perform the “e-lead relay on” statement first.

To send a tone towards the WAVE Communicators:

Router# test voice port #/#/# inject-tone network {choose a frequency you wish to inject}

To disable the tone:

Router# test voice port #/#/# inject-tone network disable

Note-If the M-lead command is set on the voice-port, remove it, and perform a shutdown and no shutdown on the voice-port 1st.

An additional item to look at is the duplex of the voice-port. If you find out that the radios aren’t really being keyed up correctly, it may be due to half-duplex being set on the voice-port and a small amount of noise being received from the radio. If this is occurring, WAVE will not be able to transmit because the noise has tied up the e/m port.

[jeremycorkery]

Hi,
I was trying to troubleshoot E&M and LMR. I've got a cisco 2811 with two port E&M card. I tried inject tones both local and network. On the local to the radio I was trying to key the radio and send a tone ranging from -20dbm to 0dbm. Figuring a 1mW would be alright. After disabling the relay and inject tone commands (didn't sucessfully troubleshoot), I can not get the LED back up on the E&M port. Could I have blown it? How can I test it? Doing a shut and no shut on the card... it seems to be normal.
Jeremy.

[kcarpenter]

Jeremy,

If you didn't hear tones on the radio or the network then you should look at cabling, faulty E&M card or voice-port configuration. Sending test tones shouldn't melt the card but you never know...

What kind of radios? I may have a example voice-port configuration for you.

Kenneth

[jeremycorkery]

My concern is I had lost the led light on the E&M card. I have it back now, after I physically removed the card and re-configured it. To me, the green LED on the port means that it's active and configured. So I'm not sure how the test voice commands changed that.

I believe I'm supposed to get orange LED when I use lmr led-on command on the router and get a signal from the radio audio through the E&M port.

Yes cabling might be an issue as I was using an ethernet joiner to extend to the radio mounts. However I didn't get anything on the network either. (headsets are working).
The radios are 1523E (119) Sincgars ASIP
I think the voice-port configuration is correct:
voice-port 0/1/0
voice-class permanent 1
auto-cut-through
operation 4-wire
type 2
signal lmr
lmr e-lead voice
input gain 12
output attenuation -12
no comfort-noise
timeouts call-disconnect 3
timing hookflash-in 0
timing ignore m-lead 175
connection trunk 0100
music-threshold -10

I'm also starting to think that maybe I couldn't hear anything as I have all the servers and clients sitting in VLAN 2. I will look at the cabling and local side first.

[jeremycorkery]

Physical cabling sorted. Faulty LMR cable. (I should know better - how annoying!) No problems now. It does seem to work with a ethernet cable joiner however.
In regard to the LED, lmr led-on actually turned off the green LED. When you transmit from the local (radio) side the LED comes on.
I would recommend you DON'T use the inject-tone command in 10Hz steps... hahah...it takes forever and can't seem to stop the process on the router.... had to let it run.