PBX Monitoring.

[novice1234]

Could anyone advise as to how to find PBX frequencies in our county? Would they be digital and hence, not monitorable? Thanks.

 

[jonwienke]

What do you mean by PBX?

Most modern scanners will monitor several flavors of digital.

 

[KK4JUG]

The only times I've ever heard PBX was in relation to telephones. It's a Public Branch Exchange. I've heard it in relation to radios.

 

[doctordialtone]

PBX

What do you mean by PBX?

PBX = "PRIVATE Branch Exchange"

A large privately held phone system, such as a Hospital or large business.

(It's what I do for a living)

 

[KK4JUG]

PBX = "PRIVATE Branch Exchange"

A large privately held phone system, such as a Hospital or large business.

(It's what I do for a living)

I knew that!! I must have had a brain fart. It's tough gettin' old.

 

[jonwienke]

I've heard of the phone context for that acronym, but that makes no sense for radios and scanning as used by the OP.

 

[Project25_MASTR]

I've heard of the phone context for that acronym, but that makes no sense for radios and scanning as used by the OP.

Considering many current systems have the ability to be interfaces to a PBX it does. Some LMR systems can even handle full duplex calls…


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[jonwienke]

Then the frequencies would be part of the trunked system, not PBX frequencies.

 

[novice1234]

PBX vs. Trunked.

Thanks to all for your responses. I was assuming a trunked system was the same as a PBX one. Not so, I see. I often hear a utility worker while I'm VHF scanning say that he will be out of the vehicle and will be available on PBX. Perhaps he's using a portable unit. Nonetheless, I didn't realize this is part of a private telephone system and hence, I wouldn't want to monitor it even if I could.

 

[wtp]

or

he might just mean phone as in cell.
some names die hard.

 

[KK4JUG]

Or he may be in his office with a landline.

 

[zz0468]

Many railroad yards have a frequency listed for a "PBX" channel. It's basically another name for telephone interconnect, or an autopatch. I've never heard the term used in reference to radio, outside of railroad communications, though. But different organizations call things different names...

 

[norcalscan]

Many railroad yards have a frequency listed for a "PBX" channel. It's basically another name for telephone interconnect, or an autopatch. I've never heard the term used in reference to radio, outside of railroad communications, though. But different organizations call things different names...

I agree. Only reference to PBX I've seen in scanning is Railroad, referencing a wide-area transmitter that had a phone interconnect.

Only thing I can think out outside of scanning is if the utility worker was a phone worker, and was going to tie a telco lineset to a service pair while up on the pole. Some telco might tie an extension of their PBX to pair 50 of a 50 pair wire for example, and then when he's out in the middle of nowhere he knows he can put his test set on pair 50 and have dialtone into their internal PBX.

 

[DJ11DLN]

A local hospital using an analog LTR system has a PBX TG. I've heard calls attempted over it but never one completed, i.e. several rings and disconnect or rings and goes to voicemail, then disconnect without leaving a message. So somebody still uses it, or tries to anyway.

I never hear anything on the RR PBX frequencies around here.