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Identifier Printed Circuit Board

See below for a close up view of the various PCB sections


The Identifier Printed Circuit Board, 4 line model shown.

Close Up Look

Telephone Line Circuitry


This is one of the major differences between the YES Identifier and its competitors. We add an active two stage amplifier (LF347) to pre-condition the Caller ID and Touch Tone signals rather than just a passive RC filter. Also notice the lighter green color at the top near the telephone line connector. The darker color green indicates where the internal layers of power and ground planes exist. These internal layers remarkably improve power and ground distribution which reduce electrical noise for more reliable operation. None of our competitors use these internal planes because they dramatically increase the cost of the circuit board. Because they improve the quality of the product YES uses them.

Micro-Processor Circuit


From left to right: Microprocessor, UART, RAM, and EPROM. The stand out component here is the UART. This gives the Identifier superior communications by providing full hardware hand-shaking and data buffering. This greatly improves hardware to software (Identifier to PC) communication by eliminating the loss of data. We use an external EPROM for greater program (firmware) capacity. The RAM is where call data is stored for later retrieval. This is a backup in case the host computer or software fails.

Serial Input and Output


The 16C450 UART chip shown here is the most expensive chip on the PCB. This gives us hardware handshaking that is very important in the diagnostic procedure and its FIFO buffer eliminates any possible loss of data. No ohter caller id unit has this feature.