BT8110 데이터 시트보기 (PDF) - Conexant Systems

부품명

상세내역

제조사

BT8110

High-Capacity ADPCM Processor

Conexant Systems 

Appendix E . E1 ADPCM Transcoder

E.1 Introduction

Bt8110/8110B

High-Capacity ADPCM Processor

full-rate and compressed ports required by G.761, and to enter, implement, and

monitor diagnostic tests of the Bt8110/B.

The Bt8510 E1 framers include analog line interfaces that are compatible with

75 Ω cable or 120 Ω wire-pair lines, a digital timing-recovery circuit, and slip

buffers. This allows the circuit set to provide all termination and synchronization

functions required for transcoding. The ADPCM processors operate on a

time-shared-logic principle, so that all circuit elements are shared by all channels.

This characteristic makes it possible to provide a full-time diagnostic test of both

Bt8110/Bs on the framing and signaling timeslots without disturbing active

traffic.

Figure E-1. Single-Board Transcoder Assembly

UART Link

RS-232C

Microprocessor

Bt8510

E1

A

Framer/LIU

B

E1

Framer/LIU

Bt8110/B

ADPCM

Processor

Bt8200

ADPCM Line

Formatter

Bt8200

ADPCM Line

Formatter

E1

Framer/LIU

C

Bt8110/B

ADPCM

Processor

100060_027

Each ADPCM processor consists of a 68-pin PLCC integrated circuit (and a

128 K ROM for the Bt8110). Each Bt8510 consists of a 68-pin PLCC circuit.

Each Bt8200 consists of an 84-pin PLCC integrated circuit and an 8 K x 8 RAM.

The microprocessor can be provided by several different configurations, but a

typical configuration includes an Intel 80C188 processor and program memory.

Only a +5 V supply is required; power consumption of the assembly totals less

than 4 Watts. The entire transcoder can be put in approximately 40 square inches

(260 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 constructed in this configuration is available. The

microprocessor is programmed to obtain maintenance and status information,

provide the signaling conversion between the full-rate and compressed E1

streams, and to perform diagnostic tests of the Bt8110/Bs. A software listing of

the program used by the Bt8200EVM-E1 is available upon request.

E-2

Conexant

100060C

Share Link: