tad@ssc.UUCP (Tad Cook) (09/22/90)
I am looking for a device that can go between the telco line side of a key telephone system and a two-way radio system. The operator of the device pushes the line button on the key telephone associated with this device, and audio from the radio system is patched into the telephone. The operator can then press a footswitch to key the push-to-talk circuit of the radio, and talk over the radio using an operator's headset that is part of the telephone. I thought of using a ringdown circuit between a line position on the key system and one of those simplex autopatches, but there must be a simpler solution that does not require the ringing voltage from the ringdown circuit, and provides it's own battery feed to the phone system. I also would not need the sampling that the simplex patch provides which allows a mobile unit to access the phone system. This is a very simple patch that would be under control of the operator. Is there a stand-alone unit that would do this? I know that Plant Equipment has a card (the 3134 KTU Radio Access) that does this, but only as part of their whole key system. If anyone has some thoughts on this and cannot reach me via email, you can call me from 7:40am to 3:50pm Pacific Time weekdays at 800-824-9719 or 206-881-7000, and ask for PAUL COOK. Tad Cook Seattle, WA Packet: KT7H @ N7HFZ.WA.USA.NA Phone: 206/527-4089 MCI Mail: 3288544 Telex: 6503288544 MCI UW USENET:...uw-beaver!sumax!amc-gw!ssc!tad or, tad@ssc.UUCP
Dave_JOHNSTON%01%SRJC@odie.santarosa.edu (09/24/90)
In <TELECOM Digest V10 #668>, Tad Cook <tad@ssc.UUCP> wrote: >I am looking for a device that can go between the telco line side of a >key telephone system and a two-way radio system. The operator of the I've had experience with a product from Selectone. This name should be familiar to anyone in the Two-Way world. They're a manufacturer of tone encoding and decoding products. I had a customer install one and its worked great. If need be I can get the model number etc. Basically, it just looked like a CO line to the key system. It is VOX operated with a delay so there is no need for footswitches etc. The user just picks up the phone and talks. It also can ring the phone. Its selectable to allow three microphone clicks, DTMF, or PL (Private Line for all you non-radio people ... a Motorola name for CTCSS sub- audible tone encoding) to trigger the unit to ring the phone. I highly recommend it. The customer is a radio station and they certainly put it through it's paces. Its been in service for several months without a hitch. Dave Johnston johnston@Odie.SantaRosa.EDU Supervisor, Campus Data/Telecom Santa Rosa Junior College Phone: +1 707 527 4853 1501 Mendocino Ave, S.R., CA 95401
mwilson@orion.arc.nasa.gov (Mike Wilson) (09/26/90)
In article <12459@accuvax.nwu.edu> tad@ssc.UUCP (Tad Cook) writes: >Is there a stand-alone unit that would do this? I know that Plant >Equipment has a card (the 3134 KTU Radio Access) that does this, but >only as part of their whole key system. I have used the Plant Equipment 3134 KTU in generic 1A2 Key Systems with no problems. It was the perfect solution. Mike Wilson Phone: (415) 604-6846 mwilson@orion.arc.nasa.gov
nagle@uunet.uu.net (John Nagle) (09/28/90)
>In <TELECOM Digest V10 #668>, Tad Cook <tad@ssc.UUCP> wrote: >>I am looking for a device that can go between the telco line side of >>a key telephone system and a two-way radio system. This is how it all started. Remember Carterfone? John Nagle
tad@ssc.UUCP (Tad Cook) (10/05/90)
In article <12757@accuvax.nwu.edu>, decwrl!well.sf.ca.us!well!nagle (John Nagle) writes: > >In <TELECOM Digest V10 #668>, Tad Cook <tad@ssc.UUCP> wrote: > >>I am looking for a device that can go between the telco line side of > >>a key telephone system and a two-way radio system. >This is how it all started. Remember Carterfone? No, I am not looking for something to connect from a telco line to a two-way radio. I just want to be able to control the radio from a spare CO line position on the key telephone. No connection to the public switched network at all. Simplex autopatches are common, and they will connect the radio to the telephone line. I want something that makes the radio look like a phone line to the telephone ... without any ringing. The telephone only needs to contact the radio, not the other way around. Tad Cook Seattle, WA Packet: KT7H @ N7HFZ.WA.USA.NA Phone: 206/527-4089 MCI Mail: 3288544 Telex: 6503288544 MCI UW USENET:...uw-beaver!sumax!amc-gw!ssc!tad or, tad@ssc.UUCP