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 <[EMAIL PROTECTED]>: > > > 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 > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > Visit Winfield Public Schools at http://usd465.com ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users