ADSP-21MOD870-110 Просмотр технического описания (PDF) - Analog Devices

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ADSP-21MOD870-110

Internet Gateway Processor Software

Analog Devices 

ADSP-21mod870-110

T1, E1,

PRI, xDSL,

ATM

LINE

INTERFACE

CALL

CONTROL

IDMA

ADSP-

21mod870

SP0

IDMA

ADSP-

21mod870

SP0

IDMA

ADSP-

21mod870

SP0

PORT LINK

BUS

IDMA

ADSP-

21mod870

SP0

IDMA

ADSP-

21mod870

SP0

IDMA

ADSP-

21mod870

SP0

IDMA

ADSP-

21mod870

SP0

HOST

(ADSP-2183)

IDMA

ADSP-

21mod870

SP0

LAN OR

INTERNET

ADSP-21mod870 FUNCTIONS

V.34/56k MODEM

DTMF DIALING

V.17 FAX

CALLER ID

V.42, V.42bis, MNP2-5 HDLC PROTOCOL

HOST FUNCTIONS

MULTI-DSP CONTROL, OVERLAY

MANAGEMENT AND DATA TRANSFERS

Figure 1. ADSP-21mod870 Network Access System

SERIAL PORTS

The ADSP-21mod870 processor incorporates two complete

synchronous, double-buffered serial ports for serial communi-

cations. The serial ports interface directly to a time-division

multiplexed (TDM) 1544 kbps (T1) or 2048 kbps (E1) serial

stream, to an 8K sample/s data stream, or to an 8-bit companded

(64 kb/s) data stream (DS0). The serial ports operate under

modem software control.

SUPPORTED SYSTEM ARCHITECTURES

The ADSP-21mod870-110 Internet Gateway Processor Soft-

ware supports two system architectures: serial Telco PCM TDM

data stream and parallel Telco PCM data stream. The two archi-

tectures are differentiated by the method of proving Telco

PCM data to the DSP Modem.

Serial Telco PCM TDM Data Stream Architecture

The serial Telco PCM TDM data stream architecture, shown

in Figure 2, is the most common architecture. In this architec-

ture, the modem pool may have a local Telco interface that

provides a serial TDM data stream of Telco PCM data to the

DSP through the DSP’s Serial Port. You can connect up to

24/32 DSPs, through the Serial Port, to a 24/32 channel serial

TDM data stream.

MEMORY I/F DMA PORT

SERIAL PORT

ADSP-

21mod870

Parallel Telco PCM Data Stream Architecture

The parallel Telco PCM data stream architecture, shown in

Figure 3, provides a single bus interface for all data and control.

In this architecture, the modem pool may have a remote Telco

interface that provides a parallel data stream of Telco PCM data

to the DSP through the DSP’s DMA Port. An arbitrary number

of DSPs can be connected, through the DMA Port, to a Host

that provides the parallel data stream.

Note: The number of parallel DSPs is limited only by the soft-

ware loading constraints on the Host.

MEMORY I/F DMA PORT

ADSP-

21mod870

ADSP-

21mod870

HOST

ADSP-

21mod870

ADSP-

21mod870

TELCO PCM

I/F

Figure 3. Parallel Telco PCM Data Stream Architecture

HOST

ADSP-

21mod870

ADSP-

21mod870

TELCO PCM

I/F

ADSP-

21mod870

Figure 2. Serial Telco PCM TDM Data Stream Architecture

–2–

REV. 0

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