Product Specs

TPRM ProductSpec.doc

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1. Introduction

This document describes the specification of a CDPD module, which is designed for

system integrators that require a CDPD modem.

Section 2 describes the hardware interface for this module. The module has a serial

interface connector for the Host to communicate with. An antenna connector is also

provided for connecting to an external antenna. A standard 50Ω dipole antenna is

suggested.

The software specification are referenced in Section 3. For a detailed description, refer

to referenced documents containing the specifications. Some operation procedures are

given in Section 4. These procedures should be treated as examples for the Host

firmware developer. The mechanical specification is given in Section 5. FCC

Requirements are provided in Section 6.

2. Hardware Interface

In this section, we describe the external interface of the CDPD modem module. The

hardware interface has two parts: the antenna connector and the baseband signal

connector.

The antenna connection is a standard MMCX 50Ω connector. A 50Ω co-axial cable is

required to connect to the external antenna. A standard 50Ω dipole antenna is

recommended.

The baseband serial connector is an SMT ZIF Connector, 12 Pin, FH10-12S-1SH Hirose

(53-152310-02TEKCON) which accepts a I mm Flex Cable.

Host Interface

An asynchronous serial interface to the Host is implemented to support the

communications and data transfer between the modem and the Host. A 12-pin

connector is used to implement this serial interface. The Host should set up the serial

communication line control to match with the modem’s communication line setup. The

parameters, which must be set, include the baud rate, number of data bits, parity, and

number of stop bits. The modem parameters are 38400 baud, 8 data bits, no parity, and

1 stop bit (or more concisely, 38400 8-N-1).

The pin assignment is shown in the connector pin out table below. Take extra

precaution to ensure that pin 1 of the mating connector connects to pin 1 of the board

connector. When looking into the connector on the TPRM unit, pin 1 is on the far right.

Also ensure that the contacts on the connector cable mate to the contacts on the

connector. The connector contacts for the TPRM are on the top, when looking into the

connector.