DSL Analog Line into PBX?

Edwards Finance > Phones

Q. We had 2 DSL lines installed by GTE a couple of months ago. They required me to add new trunks for each circuit since they said they could/would not attach the pots side to my Rolm PBX. I could see no reason why they could not be connected, so today I made up my own somewhat crude RJ45 to 66 block connections and activated two more trunks on my PBX. I connected the filters of course. Am I confused, or is there some good reason why I cannot or should not be able to use the pots side of the DSL as a regular PBX trunk? They seem to work fine to me?

A. Could you elaborate on "something goes wrong"? My PBX card goes bad? I fry something in the CO? My DSL digital goes flakey? I know nada about actual DSL technology, so perhaps someone can explain what can go wrong? There's absolutely nothing wrong with what you've done - I used to install/troubleshoot dsl lines and have installed tons of pbx's and can think of only one possible reason the installer wouldn't put the analog line (after the pots splitter) into your pbx... laziness. The installer either wanted to get to coffee break or simply didn't know what to do. Mabe he didn't know it would be fine. Mabe he didn't know the effect it would have on the PBX. BTW what happends when a filter fails? Most CO guys do NOT install nor repair PBX equip. Sounds to me like he's being rather smart about it IMHO. The average telco seems to get weird when there's any sort of "engineered circuit" flag on a circuit. For example, I have a phone number that appears at both my house and my office, and it took months to activate Caller ID on it because it was marked as an engineered circuit and thus the business of- fice couldn't modify features - it had to get escalated for engineering re- view. Given the effort involved and the low margin to the telco on DSL pairs, I expect they just can't be bothered to approve the combination of DSL + PBX, even though there's nothing unusual about it in *your* case. Consider the case of a ground start PBX line (not all that uncommon). I expect that would not work with DSL. Depending on the splitter technology used, either the PBX would not be able to get dial tone on that line or the DSL circuit would take a hit every time someone originated a call on that line.

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