[Asterisk-Users] far end disconnect supervision

[Jonathan Moore]

I found this supplier on ebay and they seem to have a regular supply of Adit
600s. I spent $800 for one with 8 fxo/8 fxs. This may be out of your price
range, but I think it is a pretty good deal for this model. I really recommend
the 600. It did amazing things to eleminate our echo problems. My experience so
far with the ebay thing is you may wait a while to find something with all the
features you want and with fxo cards and fxo cards are pricy when bought
seperately/new. The way I finally got a unit was to use ebay to find vendors
selling Adits and then contect them directly for the configuration I wanted.

I made the wrong initial purchase and ended up with an AB1 (with broken ring
generator to boot). They definetely do not support disconnect supervision.

http://www.sunteldata.com/

-- 
Jonathan Moore
Director of Technology
Winfield Public Schools
Office 620.221.5100
Fax 620.221.0508


Quoting Lance Arbuckle <asterisk at arbuckle.org>:

> 
> 
> Rich Adamson wrote:
> > 
> > > > > I'm starting to shop for my first channel bank and one of the
> features
> > > > > that eveyone seems to recommend is "far end disconnect supervision".
> > > > > What other terms do various manufactures use to describe this same
> > > > > feature ?
> > > > >
> > > > > Is "calling party disconnect" the same as "far end disconnect
> > > > > supervision" ?
> > > >
> > > > Yes, in most readers terms. However, in some cases marketing/sales
> > > > people may have written stuff with no clue what they are talking
> > > > about.
> > >
> > >
> > > Is "far end disconnect supervision" BOTH a service/feature/line
> > > signaling provided by the Telco AND a feature of some channel banks ?
> > >
> > > If some channel banks don't support this, how on earth do they know when
> > > the telco side of the call has hung up ?
> > 
> > If you go way back in history, channel banks were only used by telcos and
> > at least initially were only required to pass signaling between central
> > office switches. It wasn't until fx cards were added that channel banks
> > had to be concerned with "calling" and "called" party disconnects. In some
> > states, the regulatory agencies governed what could (or could not) be
> > deployed and under what conditions. "Called party disconnect" was
> frequently
> > used by court order for police verification on certain calls, while
> > "calling party disconnect" was the norm. At that time, customer lines were
> > directly connected to the central office switch, and it was functions
> within
> > the switch that controlled calling/called party disconnects.
> > 
> > If the telco deployed a channel bank with fx-type customer interfaces, the
> > channel bank would need to support "calling and called party disconnect"
> in
> > order to inform the central office switch of call status.
> > 
> > If the telco deployed a channel bank with interfaces to a customer's pbx
> > where signaling used tones (as an example), the channel bank would not
> > need the added electronics to support disconnect supervision.
> > 
> > Disconnect supervision refers to opening/closing the 2-wire circuit (as in
> > hanging up a telephone), and in some cases, reversing tip/ring (48 volt
> > polarity change).
> > 
> > (There are a number of other interfaces available for channel banks beside
> > those designed for two-wire fx's.)
> > 
> > Since there are lots of old (and new) channel banks being sold on ebay,
> etc,
> > that may have been designed for different purposes, some will support
> > disconnect supervision while others do not, some are two-wire while others
> > are four-wire, some support E & M signaling (extra wires per channel),
> some
> > supply 100vac ringing voltage while others do not, some run on only 48
> volt
> > DC power while others are 110 vac power, etc.
> > 
> > If you're looking for a channel bank to interface phones with asterisk,
> then
> > keywords would include "2-wire", "disconnect supervision", "fx lines",
> etc.
> > Might also ensure it can supply the needed 100 vac ringing voltage
> > (historically referred to as a ring generator).
> 
> 
> Yes, I'm looking for a channel bank to interface analog phones and pstn
> lines to asterisk.  I've got a simple test system setup with the TDM10B
> and X100p and want to continue learning asterisk with the T1 card.
> 
> I've been reading the list archives and searching Ebay for channel
> banks.  There are lots of Carrier Access Corp (CAC) Access Bank I and
> II's available but I don't explicitly see anything about "calling party
> disconnect" in the user manuals.  The CAC Adit 600 manual, on the other
> hand, states that "calling party disconnect" is supported on the FXO
> interfaces.  That's great, but I haven't seen any on Ebay and I can't
> justify the expense of a new unit.  Acording to the list archives the
> Adtran 750/850 units work well but I haven't read the manuals for those
> units yet.
> 
> Basically, I was hoping to purchase a functional, used, older channel
> bank for a few hundred dollars so that I could continue learning
> Asterisk and to also have a system to demonstrate to potential clients. 
> Any suggestions welcome.....
> 
> -Lance
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