UG-1032 6LAP5 LAN Adapter Panel Dual Modem
Copyright © 2016 QEI
General Description
1
1 General Description
The 6LAP5 is a PCB assembly designed for use with the 6CPP6 Central Processor
Panel only. The 6LAP5 plugs into the Central Processor Panel through two 32-pin
DIN connectors, and provides two independent communications ports. The ports are
identified as PORT #1 and PORT #2. Both ports are Bell 202 compatible dedicated
telephone line modem capable of asynchronous operation. The two modems can be
configured to provide both bit-oriented protocols, both byte-oriented protocols or one
bit-oriented and one byte-oriented protocol. The protocol used in the 6LAP5 is
determined and configured by the 6CPP6 Central Processor Panel.
Each Bell 202 modem consists of a Silicon Systems SSI73K302 single-chip modem
IC controlled by a Microchip PIC16C62 micro-controller. It includes registers, which
are configured by the 6CPP6 Central Processor Panel to control modem
communication settings, such as RTS/CTS delay, local squelch duration, etc.
Pluggable jumpers are provided for adjusting transmitter gain, receiver sensitivity,
and 2-wire or 4-wire operation. An on-board LED provides visual indication that the
modem micro-controller is functional. This modem does not contain transmit and
receive transformers for signal coupling to/from the telephone lines. Connections
between the modem and external line transformers are made via a six-pin MOLEX
mini-fit type connector.
Also in order to compensate the high frequency loss on the communication lines
each modem is equipped with a high frequency emphasizing circuit, which provides
6dB slop gain compensation from 300 to 3000 Hz. An alternate mark/space
frequency tone is jumper selectable and can be used for line alignment.
The data and control signals are in logic levels, which are required by the UARTs on
the 6CPP6 Central Processor Panel. Connections are provided for handshaking, as
well as PTT (push-to-talk). Unused inputs are pulled to -12V (inactive state for the
UARTs on the 6CPP6 Central Processor Panel) using internal 10K ohm pull-down
resistors.
The 6LAP5 receives its power from the Central Processor Panel through its two 32-
pin DIN connectors, JP4 and JP5. No external power supplies are required.
Many of the 6LAP5 modem configuration settings are under software (program)
control. The configuration resides in the 6CPP6 Central Processor Panel that the
6LAP5 is connected to. Before the 6LAP5 can be placed in operation, it requires that
the proper configuration be placed
into the 6CPP6 Central Processor Panel using
Configuration Table software.
Refer to the 6CPP6 ConfigWiz Manual for information and
instructions.
WARNING
The 6LAP5 is designed to connect to the 6CPP6 panel at JP4 and JP5 only. Do
not connect the 6LAP5 to JP6/JP7 or any other connectors on the 6CPP6!!!!
