MT8950 Просмотр технического описания (PDF) - Mitel Networks

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MT8950

ISO-CMOS ST-BUS™ FAMILY Data Codec

Mitel Networks 

MT8950 ISO-CMOS

The SPo pin could then be monitored by the

system processor to detect a prompt from the

peripheral.

MT8950

+5V

R

11

C

NRZo

16

SPo

SPi 15

Figure 7 - Long Space Detection Circuit

External Power Reset

When the reset input (PRST) is taken low, the data

codec circuit goes into reset mode. The conditions

present on the output pins are as follows:

1. DSTo -

2. SPo

-

3. DA

-

4. DP

-

5. DR1

-

6. DR2

-

7. NRZo -

High Impedance

+5V (unasserted)

+5V (unasserted)

GND (unasserted)

+5V (inactive)

GND (inactive)

GND (Mark condition)

The internal Control Register is loaded with HEX

FF.

Applications

A block diagram schematic of a simple Voice-Data

integrated switching system is illustrated in Figure 8.

The data terminal can access a number of remote

devices via the gateway provided by the Data

Codec. In this application, the Data Codec function

parallels that of the Voice Codec, i.e., the Voice

Data Terminal

Equipment

Main

Frame

Computer

Voice

Codecs

Data

Codecs

T1/CEPT

Interface

Digital PBX

Data

Codec

Voice

Codec

ST-BUS Format

MT8980

Digital Switch

MPU

Main

Frame

Computer

Main

Frame

Computer

6-12

Voice

Codecs

Data

Codecs

Digital

Line

Interface

Voice

Codec

Data

Codec

Digital

Network

Interface

T1/CEPT Leased Lines

1.544 Mbit/s or 2.048 Mbit/s

256 kbit/s

Digital Line

160/80

kbit/s

Main

Frame

Computer

ST-BUS Format

T1/CEPT

Interface

Digital

Line

Interface

Digital

Network

Interface

Data

Codec

Voice

Codec

Figure 8 - Voice-Data integration using the Data Codec

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