The diode matrix translates a "1-of-200" contact closure into an 8-bit binary number. (two hex digits). The hex line ID numbers range from 01 through C8, with 00 reserved for testing. Since there are 5 linefinders, the ANI must scan across them until it finds the one which has the call to the ANI. That happens when you hear those fast little beeps. The beeps are the ANI scanning. Once the proper linefinder is identified, then a 48 volt signal is sent to back jack pin 5 on it. That 48 volts flows through the linefinder and then out on either the A or the A1 bank wiper, which has landed upon those bank contacts which represent the line I.D. of the calling line. That signal then flows through a 200 conductor cable, over to the diode matrix, which generates the 8-bit line I.D. code, which it then sends over to the ANI on those 3 boards on the table across the room. There, that 8-bit line I.D. code then gets turned over to a 2732A EPROM which has been programmed to act as the translation table that contains all of the phone numbers associated with all 200 of the 8-bit line I.D. numbers. Those phone number digits then get passed along to Digitalker so it can be spoken and at the same time it is fed to the flashing green 7 segment readout, which shows the calling phone number one digit at a time as it gets spoken.
How does it work? By that I mean, how does it know which line is calling it?
The diode matrix translates a "1-of-200" contact closure into an 8-bit binary number. (two hex digits). The hex line ID numbers range from 01 through C8, with 00 reserved for testing.
Since there are 5 linefinders, the ANI must scan across them until it finds the one which has the call to the ANI. That happens when you hear those fast little beeps.
The beeps are the ANI scanning. Once the proper linefinder is identified, then a 48 volt signal is sent to back jack pin 5 on it. That 48 volts flows through the linefinder and
then out on either the A or the A1 bank wiper, which has landed upon those bank contacts which represent the line I.D. of the calling line. That signal then flows through a
200 conductor cable, over to the diode matrix, which generates the 8-bit line I.D. code, which it then sends over to the ANI on those 3 boards on the table across the room.
There, that 8-bit line I.D. code then gets turned over to a 2732A EPROM which has been programmed to act as the translation table that contains all of the phone numbers
associated with all 200 of the 8-bit line I.D. numbers. Those phone number digits then get passed along to Digitalker so it can be spoken and at the same time it is fed
to the flashing green 7 segment readout, which shows the calling phone number one digit at a time as it gets spoken.