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Digium TE122 E1 and Asterisk in Guatemala with Claro always in RED alarm

Hello, I've got this problem and maybe somebody has had the same, here are the details:
Asterisk =
E1 card= Digium TE122PF
Dahdi Version =2.4.0
Country= Guatemala
Provider= Claro

E1 Settings given by claro:
cable= straight (we tested a crossover as well just in case)
Framing/Coding= CCS/hdb3 and CRC4 (claro says they need CRC4)
PRI_CPE on our side
Clock/Sync on their side (1)

So far all we've gotten is RED alarm, never a green alarm.

we've tried:
1- using straight and crossover (1-4 and 2-5) cables (provider says it should be straight)
2- card is good since we switched to a new one and still the same
3- provider (Claro) tests the connection and with their testers it works fine
4- changing framing to non crc4, clock in 0 or 1, isdn2 (just in case) and nothing still
RED alarm
5- we put the loopback with a straight cable and alarm goes green (OK)

Please, if anybody has had any experience with E1s in Guatemala (claro) let me know if you can.

thank you
Avatar of joshopkins

The cable should be a T1/E1 roll over cable.  We had the same issue and that fixed it for us.
Avatar of darwin_roach


what type of cable is that please?
I just saw it on a web page, it means pin 12345678 should go in the opposite direction on the other end, right? so on one side the order of the cables would be 12345678 and the other side would be 87654321, is that right?
thank you, I'll give it a try later today after I make the cable.
I just installed the roll over cable and unfortunately it did not help, the alarm is still in RED, the device the carrier uses is a RAD, model: asmi-52l/e1/2w

any other ideas?
I found something in the manual of the device recommending to use only 4 wire connector, right now we're using an 8 wire connector/cable, so we will try that tomorrow.


make sure from your provider side by using a loopback on the RAD unit and let your provider check if it's looped or not,,
plus, use pins 12,45 and check ??
send more details about your:
/etc/asterisk/dahdi-channels.conf  and  /etc/dahdi/system.conf
Actually I put Digium to work on this case and they say the card and configuration is OK, that the problem should be on the carrier's side or the connections, so I took a look at this device's manual and found that in appendix A about the pinouts they mention that if you have a E1/T1 connection you should use 4 wire cables only, because it seems that if you use a cable with all 8 wires then the RAD tries to use pin 7 for CPU ID and pin 8 for ground. I was using 8 wire cables all the time, so what I'll do today is try with a 4 wire cable only and see how this develops, hope this solves the issue, because it is driving me crazy.
I'll post the config files later if this solution doesn't help.

thank you.
I just tested with both 4 wire cables, crossed over and straight thru, none of them solved the issue, here are my system.conf and dahdi-channels.conf, maybe you can see something I did not...

span = 1,1,0,ccs,hdb3,crc4
bchan = 1-15,17-31
loadzone = us
defaultzone = us

switchtype = euroisdn
signalling = pri_cpe
channel => 1-15,17-31
context = default
group = 63

thank you.
add this "dchan=16" to your system.conf

span = 1,1,0,ccs,hdb3,crc4
bchan = 1-15,17-31
loadzone = us
defaultzone = us

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