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參數(shù)資料
| 型號(hào)： | ADSP-21MOD870-110 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | Internet Gateway Processor Software |
| 中文描述： | 56 kbps DATA, 8 kbps FAX, MODEM, PQFP100 |
| 封裝： | METRIC, PLASTIC, TQFP-100 |
| 文件頁(yè)數(shù)： | 2/6頁(yè) |
| 文件大?。?/td> | 60K |
| 代理商： | ADSP-21MOD870-110 |
REV. 0
ADSP-21mod870-110
–2–
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: s
erial 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.
ADSP-
21mod870
HOST
TELCO PCM
I/F
ADSP-
21mod870
ADSP-
21mod870
ADSP-
21mod870
SERIAL PORT
DMA PORT
MEMORY I/F
Figure 2. Serial Telco PCM TDM Data Stream Architecture
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.
ADSP-
21mod870
HOST
TELCO PCM
I/F
ADSP-
21mod870
ADSP-
21mod870
ADSP-
21mod870
DMA PORT
MEMORY I/F
Figure 3. Parallel Telco PCM Data Stream Architecture
ADSP-
21mod870
SP0
IDMA
ADSP-
21mod870
SP0
IDMA
ADSP-
21mod870
SP0
IDMA
ADSP-
21mod870
SP0
IDMA
LINE
INTERFACE
CALL
CONTROL
T1, E1,
PRI, xDSL,
ATM
PORT LINK
BUS
(ADSP-2183)
LAN OR
INTERNET
V.34/56k MODEM
V.17 FAX
V.42, V.42bis, MNP2-5
ADSP-21mod870 FUNCTIONS
DTMF DIALING
CALLER ID
HDLC PROTOCOL
HOST FUNCTIONS
MULTI-DSP CONTROL, OVERLAY
MANAGEMENT AND DATA TRANSFERS
HOST
ADSP-
21mod870
SP0
IDMA
ADSP-
21mod870
SP0
IDMA
ADSP-
21mod870
SP0
IDMA
ADSP-
21mod870
SP0
IDMA
Figure 1. ADSP-21mod870 Network Access System
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