Yellow Alarm PRI 1

[g18c]

I have a 30 channel PRI, customer is complaining of intermittent dropped calls and bad sound quality.

From the numbers they sent the issues occur mostly on international calls.

When i am on the phone i can hear her perfectly but she says my voice sounds distorted.

I am getting a couple of Yellow Alarms per day from the ISP, the ISP insists their system is fine.

This system has been in place for 6 months without issue, no changes recently made.

What to do:

Does the yellow alarm indicate the ISP have a problem as they for sure don't want to acknowledge it?

Is there any chance the yellow alarm may be falsely generated locally on our equipment?

I will swap out the PRI cable for a new one, other than that any other suggestions?

 

[Tjohnston224]

I believe a yellow alarm indicates a transmission problem and has to be received from the circuit provider. Swap the cable and then push the provider harder.

 

[Demce0501]

In the PRI setup - check switch type. I've experienced similar problems with the wrong type selected here.

 

[CarGoSki]

RED ALARM indicates corruption, loss of signal or inability to frame reliably. Essentially this means that the local equipment cannot properly see the far end. In this case the local system will transmit a yellow alarm while in a red alarm state.

YELLOW ALARM indicates that the system has been instructed by the far end that there is an issue with communication. If the issue were local the alarm state would be RED but because a yellow alarm must be received. Also it is not possible to have both a red and yellow alarm state on the same piece of equipment in that you cannot receive the instruction to enter yellow state if you are in a red state.

BLUE ALARM indicates that there is no communication on the path so the equipment will transmit all 1s in the framing time slots to maintain the signal. When one end is in blue alarm the other end will be in a red alarm and as a result the end in a red alarm will transmit a request for the other end to enter a yellow alarm.


Cabling is always something to examine particularly in corrosive environments or with crappy cabling in the environment.
You could always put a external CSU between telco circuit and IPO to see if the issue is towards ipo or telco.

 

[g18c]

Thanks guys. You mention check the switch type any specific setting to select? System has been running fine for many months.

ISP say they cannot see the alarms on their system

 

[smokinjoe2938]

demand that they come out on site with a t bird tester, they always say it's not their issue

ACSS-SME,ACSS Avaya Aura Session Manager and System Manager,ACSS Avaya Scopia Solution,ACSS Avaya one-X UC Soft Clients,ACSS Avaya Session Border Controller, ACSS Avaya Aura Messaging,
ACSS Avaya Aura Call Center Elite, ACSS Avaya Aura CM and CM Messaging,ACIS Avaya Aura CM and CM Messaging, ACIS SME, ACIS Avaya CM 5.2.1

 

[Telecomboy]

The switch type must match their switch type. So, if you are programmed NI2, they must also be programmed NI2. If they are 5ESS, you need to be 5ESS. NI2 is the most common setting. If you are set differently, the system may work while taking on errors, once errors hit a certain level the circuit will bounce and then come back up and work again until errors build up again to bounce it again.

 

[jayjr1105]

We get a yellow alarm every once in a while. It's usually after hours at like 3AM but we have good voice quality 99% of the time. I wish I knew more about telco stuff but I wonder if the cable type matters. When we install systems with a Comcast PRI they always want you to make or purchase an RJ48c cable(T1 crossover cable) but on some other PRI install's I'm sure I've used regular T568 patch cables and it's worked fine.

 

[teletechman]

anything from and Adtran with Comcast needs to have a PRI crossover cable, it won't work without it.
Mike

 

[yankblan]

How would a crossover cable make a diff? It's the blue and brown pairs used in a PRI.

ACSS-SME

http://interconnexionsld.ca/

 

[tlpeter]

PRI uses green and orange pairs over here so that could be an issue.

BAZINGA!

I'm not insane, my mother had me tested!

 

[pmcook]

Orange and blue in the US, mate. Not brown. Pins 1+2 and 4+5.

 

[yankblan]

I linked two Norstar MICS couple of years ago; crossed over pairs 4-5/7-8 .

ACSS-SME

http://interconnexionsld.ca/

 

[yankblan]

Then again, maybe I had the right pins and the wrong colours.

ACSS-SME

http://interconnexionsld.ca/

 

[teletechman]

Make sure it is a PRI crossover not a network crossover
PRI crossover= pins 1 to 4 2 to 5

 

[jayjr1105]

Yeah, that's called a TI crossover cable or RJ48c. That's what Comcast requires to hook up the adtran to the pbx. I swear when I was a telephony noob installing Cisco UC system I've used straight patch cables before with certain PRI's.

 

[teletechman]

Yes some providers use different equipment for their PRIs, I know that if we see a Cisco IAD it uses a straight through, but with the Adtran units it uses a crossover.
Mike

 

[jayjr1105]

While we are on the PRI subject, what do you guys set the IP Office to for PRI channel allocation, 23>1 or 1>23 ?

 

[yankblan]

23>1

ACSS-SME

http://interconnexionsld.ca/

 

[CarGoSki]

Since you are CPE then you are the slave so you descend.
You should send calls out on the upper and receive calls on the lower.
But it can be either as long as it is arranged with telco.