rsnider@xrtll.uucp (10/21/89)
Dave Levenson writes: >This may mean that the 5ESS supports ADAS. It may also be a CPE-based >version of the same service. Perhaps the armored panel phone in the >foyer detects the touch tone from the resident's set and unlocks the >door? I don't remember seeing any brand name on the set. >When I visit, the directions on the phone tell me to dial # and their >appartment number. When I lift the handset, there is no battery or >sound in the receiver. When I enter the #, I hear what sounds like CO >dialtone. I then enter their three-digit appartment number, and hear >the three touch-tones in the receiver. As soon as I have entered >three digits, the phone dials their 7-digit number, using >pulse-dialing (I hear the pulses in the handset). The microphone is >dead (i.e. no side-tone) until after dialing is complete, but is >enabled during ringing. >When they answer, they dial 9 to admit me. I hear the first few tens >of milliseconds of their tone signal, and then silence. About 500 >msec later, the entry door goes "thunk-buzzzzzz" and I am given >access. >Does anyone recognize this system? I don't think that this is CO based at all. I have seen many of these types of devices on apartment buildings from various different manufacturers which function in this manner. When new tenants move into a building, the Super will get their phone number and program it into the machine. When someone comes to visit, they key in a number (Apartment number or other) and the device then picks up an ordinary phone line and calls that apartment. It recognizes certain DTMF frequencies from the remote end to unlatch the door. These devices are becoming quite popular since it is easier to pay for 1 phone line over many years than it is to run intercom wire to every apartment and then have to pay for service when it breaks. Richard Snider Where: ..uunet!mnetor!yunexus!xrtll!rsnider Also: rsnider@xrtll.UUCP An unbreakable tool is useful for breaking other tools.