ACS crosstalk

[ZoominCo]

Cust. has a 2 year old R4 ACS, complains of crosstalk on all 4 lines in use, from all extensions, young tech(with good hearing) confirms. someone recomended Z300A filters, will these work & where can I get them?? If not any suggestions.
Thanks!!

 

[TouchToneTommy]

Have you confirmed the source of the crosstalk as the ACS? Could be on the telco side, or the cable feeding from the MPOE to the ACS. Also, a couple of years back, we had several ACS's that had crosstalk localized to stations on the same card. Way to check is to go off hook on intercom, dial 1 digit to clear the intercom dial tone, and see if you can hear conversations on other stations.

 

[twofeathers]

When a customer is having crosstalk....dont forget to check the wireing. A lot of buildings have the old 2 pair wire.
Take 2-3 phones and plug them directly into the ACS and test again. If clear replace the wire.

 

[ZoominCo]

Thanks TouchToneTommy & twofeathers
Building wiring os new cat 3, but installed by electrician, all stations are on same card, its a small Dr.s office.(ACS w/1 206 & no stations on the 206.) Telco d-mark tested clear.

 

[jsaad]

Can anyone expand on the Z300A filters? i have crosstalk on two extensions on a standalone ACS and to replace the wire would be really...really difficult.

not sure about the grounding but we'll verify if it is a good ground.

what about putting those ferrite cores around the station cables?

 

[1043]

Try 2feathers advice. Your only fix may be a different Processor.

 

[drewmich]

I agree there may be a wiring problem or issues on the Telco side of the switch.

Another issue we have found in our repair lab with the ACS R4.0 processor is on the main circuit board. Avaya had a specific problem during manufacturing of the R4.0 circuit board where the protective coating they apply to the board - during/after components were auto heated soldered in place - was defective as this specific run of boards develop corrosion spots over the entire front and back of the board. This causes many circuit level problems translating into ones such as the one ZOOMINCO has described.

Some R4.0 processors were DOA out of the box if they were held in distribution long enough and some developed over time if they were installed shortly after production. We had a copy of an internal memo from Avaya we obtained describing this problem but I can't locate it right now.

Depending on the problem and degree of board corrosion there is a process to repair about 30% of these boards - in our experience. We have tried many solutions to effectively "cleanup" these ACS R4.0 boards. The only process that has produced any results has been "soaking" the board completely in a few inches of gasoline ... grade doesn't matter - for a few days then carefully brushing the entire board until the corrosion is removed. It is time consuming and again only about 30% effective.

Be careful if you open the shells that you don't void a valid warranty you might still have available from your vendor if you break their warranty label.

Does anyone else know any other tips on cleaning these ACS R4.0 boards?

NOTE: This corrosion only occured on true ACS R4.0 labelled processors - not on "upgraded" older boards as the corrosion is board related not software version related.



Andrew Roach
President - Drew Telecom Group, Inc.
Lucent/Avaya Voice Mail-Component-Transtalk Repair Specialists
Lucent/Avaya Telecom Brokers/Resellers
drew@triton.net
269-685-5400 - voice
269-685-5500 - fax

 

[jlshelton]

You are very brave to soak electronic boards in gasoline.

 

[drewmich]

J,

We do power them down first ....

Andrew Roach
President - Drew Telecom Group, Inc.
Lucent/Avaya Voice Mail-Component-Transtalk Repair Specialists
Lucent/Avaya Telecom Brokers/Resellers
drew@triton.net
269-685-5400 - voice
269-685-5500 - fax

 

[itpphoneguy]

Hi Andrew,
I have found that any solvent has a tendancy to "wick" into electrolytic caps (leaded). These may fail after a while. I had a friend that soaked a mixing console (Neve) and spend the next 6 months replaceing caps. He finally changed them all & now believes me. Surface mount types can be more resistant to this. Whatever works I guess.

 

[drewmich]

You are correct - I didn't want to get too techy as my reply was long anyway.

There are specific components that we would always remove from the board as they would not handle any solvent or petrol based cleaning solution.

Just got another True ACS R4.0 in today. Same problem ... small greyish circles of corrosion around solder points on the front half of the board - PS side. It was minor compared to the "bad" ones, and 30 minutes of cleaning and the board powered up successfully after being completely dead.

Andrew Roach
President - Drew Telecom Group, Inc.
Lucent/Avaya Voice Mail-Component-Transtalk Repair Specialists
Lucent/Avaya Telecom Brokers/Resellers
drew@triton.net
269-685-5400 - voice
269-685-5500 - fax