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Details on the Microchip PIC16C62A, 20 MHz, 8-bit micro-controller.
Information on the Silicon Systems SSI73K302L Bell 202 single chip modem.
Specifies asynchronous communication.
The data rate supported is 1200 baud.
Utilizes Frequency Shift Keyed (FSK) modulation.
Defines Mark (1200 Hz), Space (2200 Hz), and Soft Carrier (900 Hz).
Jumper selectable sensitivity of -30 dBm or -45 dBm.
Provides 6dB-slop gain compensation from 300Hz to 3000 Hz.
Jumper selectable transmit gain from -12 dBm to 0 dBm.
Provides alternate Mark/Space tones for line alignment testing.
Supports 2-Wire or 4-Wire line configurations via jumpers.
Specifies 600 ohms with external line matching transformers.
Open collector output sinking up to 120 mA @12Vdc.
Dimensions are 4.75 in. L x 4.00 in. W. x 1.00 in. H.
Receives power (+12Vdc, -12Vdc, +5Vdc) from 6CPP6 via DIN connectors.
Suitable for temperatures 0 to +70 C and humidity 5 to 95%.
The device weighs 4 ounces.
Configures modem receiver sensitivity to -30 dBm or -45 dBm.
Sets transmitter gain from -12 dBm to 0 dBm in 3 dB steps.
Selects between 2-Wire and 4-Wire operation.
Enables or disables the pre-emphasizing circuit.
Chooses between BYTE or Bit oriented protocols.
Inserts jumper for enabling test tone carrier.
Details the 6-pin MOLEX connector pinout for line transformer connections.
Describes Bell 202 modem IC, FSK modulation, and gain/sensitivity.
Explains connection to 6CPP6 via JP4 and JP5 for power and signals.
Provides alternate Mark/Space test tone for channel alignment.
The 6LAP5 is a PCB assembly designed exclusively for use with the 6CPP6 Central Processor Panel, providing two independent communications ports. These ports, designated as PORT #1 and PORT #2, are Bell 202 compatible dedicated telephone line modems capable of asynchronous operation. The modems can be configured to support either bit-oriented protocols, byte-oriented protocols, or a combination of one bit-oriented and one byte-oriented protocol. The specific protocol used is determined and configured by the 6CPP6 Central Processor Panel.
Each Bell 202 modem on the 6LAP5 incorporates a Silicon Systems SSI73K302 single-chip modem IC, controlled by a Microchip PIC16C62 micro-controller. This setup includes registers that are configured by the 6CPP6 Central Processor Panel to manage various modem communication settings, such as RTS/CTS delay and local squelch duration. The 6LAP5 also features pluggable jumpers for adjusting transmitter gain, receiver sensitivity, and for selecting either 2-wire or 4-wire operation. An onboard LED provides a visual indication of the modem micro-controller's functional status. It's important to note that this modem does not include transmit and receive transformers for signal coupling to/from the telephone lines; these connections are made via a six-pin MOLEX mini-fit type connector to external line transformers.
To compensate for high-frequency loss on communication lines, each modem is equipped with a high-frequency emphasizing circuit. This circuit provides a 6dB slope gain compensation across the 300 to 3000 Hz range. An alternate mark/space frequency tone is jumper selectable and can be used for line alignment purposes. The data and control signals operate at logic levels, which are necessary for the UARTs on the 6CPP6 Central Processor Panel. Connections are provided for handshaking and Push-To-Talk (PTT) functionality. 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, eliminating the need for external power supplies. Many of the 6LAP5 modem configuration settings are controlled by software residing in the 6CPP6 Central Processor Panel. Before the 6LAP5 can be operated, the appropriate configuration must be loaded into the 6CPP6 Central Processor Panel using Configuration Table software. It is crucial to connect the 6LAP5 only to JP4 and JP5 on the 6CPP6 panel and avoid connecting it to JP6/JP7 or any other connectors.
The 6LAP5 provides an alternate Mark/Space at 1200-baud test tone from each modem. This tone can be generated by removing a jumper (JP16 for modem 2 and JP15 for modem 1) from the circuit. This feature assists installers in aligning and testing the communication channel without the need for a separate tone generator. When the jumper is removed, the modem enters diagnostic mode, producing the test tone. It is essential to reinstall the jumper after testing; otherwise, the modem will remain in diagnostic mode, and no data will be sent or received.
The 6LAP5 modem connections to external line transformers are facilitated by 6-pin MOLEX type connectors. The pinout includes connections for 4-Wire Transmit HI, 4-Wire Transmit RETURN, Common, 4-Wire Receive or 2-Wire Transmit/Receive HI, 4-Wire Receive or 2-Wire Transmit/Receive RETURN, and PTT (Push-to-Talk, open collector). The PTT output can sink up to 120 mA of current at 12Vdc to the circuit common when active.
LEDs D5 and D10 on the 6LAP5 separately indicate the functional status of modem 1 and modem 2 micro-controllers. These LEDs flash at a 2 Hz rate during normal operation. If a modem cannot communicate with the 6CPP6 Central Processor Panel, there will be a momentary interruption (a brief blink) in the flashing pattern every five seconds. Additional port activity (TX, RX, and RTS) LEDs are located on the 6CPP6 Central Processor Panel.
Each 6LAP5 modem section functions as a Bell 202 compatible modem interface. This standard is used over leased or dedicated phone lines, employing Frequency Shift Keying (FSK) modulation and de-modulation. Logic "0" (SPACE) is transmitted at 1200 Hz, and logic "1" (MARK) is transmitted at 2200 Hz. An amplification stage boosts the modem transmitter output to the required line levels, necessitating external transmit and receive coupling transformers, typically installed in the 6PCP6 power supply. The amplifier's gain is jumper selectable for various dBm levels measured across the external transformer with 600ohm termination. The output of the amplifier feeds a FET switch that gates the transmission onto the communication line when the transmitter is active, controlled by the micro-controller. Another amplifier is connected to the modem receiver input, with jumper-selectable gain for different input sensitivities, also measured across the external transformer of 600 ohm line. The micro-controller initializes the modem IC and configures its operating parameters.
These parameters include RTS/CTS Delay, which is the delay between when the communications port issues an RTS command and when the modem returns with a CTS. Local Squelch Duration allows the modem to inhibit the receiver for a period after the local transmitter has turned off, preventing the local receiver from interpreting echoes in 2-wire mode. Carrier Detect (CD) to Receiver Enable Delay prevents line noise from being passed as data to the UART before actual data arrives. Soft Carrier Duration sets the soft carrier turn-off time, sending a 900 Hz tone before transmitter shutdown to prevent "ringing" on the communication line from being misinterpreted by the receiving modem. Anti-Streaming prevents continuous keying of the transmitter due to a malfunction of the 6CPP6 Central Processor Panel. After the anti-streaming counter times out, the modem disconnects from the line by shutting down its carrier and resetting its CTS line, and will not recognize the RTS line from the UART until it has been reset. Some of these parameters are controlled by the program on the 6CPP6 central processor panel, while others are determined by the user through table configuration software.
General| Model | UG-1032 |
|---|---|
| Category | Modem |
| Download Speed | 150 Mbps |
| Upload Speed | 50 Mbps |
| Weight | 30g |
| Modem Type | 4G LTE |
| Interface | USB |
| Network Type | LTE |
| Frequency Bands | LTE FDD: B1/B3/B7/B8/B20, LTE TDD: B38/B40/B41 |
| Operating System Compatibility | Windows, macOS, Linux |
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