[App_rpt-users] Strange RTCM Behavior

[Caleb Pal]

Hello All,

We have a two site Voted Simulcast consisting of 2 UHF Motorola 
Quantars, Thunderbolts, and 2 RTCM's. Master site is North, secondary 
Voter/TX site is West. Recently I have noticed significant choppy audio, 
mostly absent a PL, being transmitted from the West Site. It appears the 
repeater is keying/dekeying a couple times a second. On the West RTCM 
console I see:

02/27/2015 00:23:15.592  Inbound (Eth Rx) packet out of bounds by: -60
02/27/2015 00:23:25.532  Inbound (Eth Rx) packet out of bounds by: -60
02/27/2015 00:23:35.532  Inbound (Eth Rx) packet out of bounds by: -60

Physical link between the sites is over a Ubiquiti 5GHz link, then 
fiber. IPSEC end to end. Voter Ping output is below.

PING (West): Packets tx: 100, rx: 100, oos: 0, Avg.: 13.940 ms
PING (West):  Worst: 22 ms, Best: 7 ms, 100.0% Packets successfully 
received (0.0% loss)

Standard ping between Voter and West RTCM:

3297 packets transmitted, 3293 received, 0% packet loss, time 3297289ms
rtt min/avg/max/mdev = 2.953/4.166/111.124/3.812 ms

TX/RX buffers are 250ms. When I restart the West RTCM, the symptoms 
resolve for a hour or so, then begin to occur again.

System was previously functioning normally. Only change has been from 
ADSL to fiber at the North site. West site was down for 2-3 weeks while 
the line was switched, so I can't absolutely correlate this issue to the 
connection change.

Pings when the issue is occurring look good (<10ms voter to West RTCM)

Any ideas?

Thanks,

Caleb