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BT8110

High-Capacity ADPCM Processor

Conexant Systems 

Appendix D . T1 ADPCM Transcoder

D.1 Introduction

Bt8110/8110B

High-Capacity ADPCM Processor

Figure D-1 shows the transcoder assembly. Circuit elements required include a

microprocessor; a 12.352 MHz timing oscillator that can be synchronized to any

of the T1 signals or synchronized externally; T1 line interface units, used to

generate and recover pulses to and from the T1 lines; and an optional RS-232C

interface to a supervisory data link.

Figure D-1. Single-Board Transcoder Assembly

X

T1

LIU

RS-232C

UART Link

Microcontroller

Bt8300 (or 2 Bt8360s, Bt8370s) Bt8200

Bt8300 (or Bt8360, Bt8370)

Dual T1

Framer

X PORT

Y PORT

ADPCM Line

Formatter

Z PORT

TI

Framer

T1

LIU

Z

T1

Y

LIU

D-2

ADPCM

Processors

Bt8110/B

100060_025

The microprocessor sets the configuration of the transcoder and monitors all

status and alarm indications. It can also send and receive messages on all of the

T1 ESF data links, as required. Optional status (LED) indicators can also be set

by the microprocessor. The UART link to the RS-232C interface can be used to

transfer supervisory signaling to and from the Bt8200 ports, to set idle and

transparent (uncoded PCM or data) channels, and to provide the optional

templates for bundle transmission in AT&T PUB 54070 and Bellcore

TR-TSY-000210.

The ADPCM processor consists of two 68-pin PLCC integrated circuits (and a

128 K ROM for the Bt8110). The Bt8300 consists of an 84-pin PLCC and an

external 2 K x 8 RAM; Bt8360 is a 68-pin PLCC with internal RAM; Bt8370 is

an 80-pin PLCC with internal RAM and integral LIU; and Bt8200 consists of an

84-pin PLCC integrated circuit and an external 8 K x 8 RAM. The

microprocessor can be provided by several different configurations, but typically

an Intel 8051-family part and program memory are used. Only a +5 V supply is

required; power consumption of the assembly totals less than 3.0 Watts. The

entire transcoder can be put in approximately 30 square inches (194 square

centimeters) of circuit-board area, allowing for the development of a single-board

wall-mount unit. The compact size and low power consumption also permits the

development of built-in units for channel banks and customer-premise

multiplexers.

An evaluation board for the transcoder configuration is available. This board

uses two Bt8110/Bs, one Bt8200, and three Bt8360s.

The microprocessor is programmed to obtain maintenance and status

information, to set up template configurations, and to perform the diagnostic tests

on the Bt8110/Bs.

Conexant

100060C

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