Originally posted by bf6b5yr:
We used to see circuits that techs would “clear†a trouble by simply reseating a card, a cable, or plugging in a test set. We used to call it shocking the circuit. The problem was that you knew the trouble would be back. Verizon doesn’t seem to like to replace cards unless a problem is proved. However, there are times that starting the eliminate items by replacing them is appropriate and I’d say this was one of them. Is there a 2nd PRI at the customer location so that the copper span could be swapped to see if the trouble followed the copper facility? Many of the cards have the ability to store data. I’d ask if the history shows anything. I’m not a DMS person but I’d say the same should be true of the switch and of any digital cross connect machine if there is one in the circuit. I suspect the DMS can look at both the ISDN information and the digital facility information. If the circuit is failing there should be data showing what type of failure took place. It may not point to an actual component. The problem is getting through to the right person at Verizon. Sounds like they need to have the problem looked at by techs in both transport and in switching.
You said the circuit runs fine for 6 to 9 months and it is on copper. What is the weather when it fails? We had a problem that we chased for weeks only to find that a gas tube was opening up due to summer heat. We were able to watch it fail with a meter.
* I’m thinkin’ along two of the same lines here for possibilities.
Flakey card or port? HDSL card or DTC-I port off the DMS-100.
- The HDSL card “should†have a PM log that can be looked at.
* Weather is also a thought I had… Every 6 to 9 months is when the problems come back up? Like when the weather turns warm? If there’s much aerial cable and the LMU (loop-make up) is at the edge of loss limits, hot summer sun shining on cable can increase resistance enough to make a difference and cause the circuit to start taking errors.
* My other thought on this one is an odd possibility but still possible…. Is the DS1 NID (smartjack) locally powered? Every once in a great while there’s a situation where a NID card will need to be locally powered off convenience power rather than span power. The down side of doing this is, sometimes cross-box connection (or any other splice points) can pick up corrosion.
