参数资料
型号: DM300004-2
厂商: Microchip Technology
文件页数: 82/114页
文件大小: 0K
描述: BOARD DEMO DSPICDEM.NET 2
标准包装: 1
系列: dsPIC™
类型: 微控制器
适用于相关产品: CTR-21 PSTN,以太网 NIC
所含物品: 板,线缆,CD,电源
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PICDEM.net? 1 and dsPICDEM.net 2 Connectivity Dev Board User’s Guide
6.6
DESCRIPTION OF dsPIC30F SOFT MODEM
The Microchip data modem library includes ITU-T compliant algorithms for V.21, V.22,
V.22bis, V.23, V.32 and V.32bis modem recommendations as well as Bell standard 103.
These are the important parameters:
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V.21, V.23 and Bell 103 are Frequency Shift Keying (FSK) modems.
V.32, V.32bis and V.22bis are Quadrature Amplitude Modulated (QAM) modems.
V.22 is a Phase Shift Keyed (PSK) modem.
V.21, V.22, V.22bis, V.32 and V.32bis are two-wire, full-duplex modems.
V.23 is full-duplex when it operates with a 75-bps backwards channel.
V.22bis includes fallback to V.22, V.23 and V.21 standards.
V.32bis optionally falls back to V.22bis, V.22, V.23 and V.21 standards.
These key parameters are further detailed in Table 6-1.
TABLE 6-1:
SOFT MODEM FEATURES AND PERFORMANCE
Algorithm (1)
Data Rate
(bps)
Performance
Half/Full
Duplex
Data
Modulation
Memory (2) (Kbytes)
Program Data
MIPS
V.21/Bell 103 (4)
V.22/V.22bis
V.23 (4)
V.32
300
1200
2400
1200
600
9600
4800
Full
Full
Half
Full
FSK
PSK/QAM
FSK
QAM/TCM
13
22
15
31
1.0
1.7
1.0
3.2
4.5
7
4.5
12
14400
1200
v.32BIS
9600
Full
QAM/TCM
36
3.6
15
7200
4800
v.42 n/a 14 2.0 1.5
DP + V.42 API n/a 7 1.2 -
AT Command Set n/a 7 0.15 -
DS51471A-page 78
Note 1:
2:
3:
4:
Data pump modules, V.21, V.22, V.22bis, V.23, V.32, V.32bis and Bell 103 are
implemented in Assembly language. V.42, Data Pump and AT Command APIs are
implemented in C language.
The program/data memory usage for the V-series data pumps is NOT cumulative,
due to the sharing of components internally.
Memory size does not account for application which combines data pump, V.42 and
AT commands (if required).
V.21/Bell 103 and V.23 data pumps do not require V.42.
? 2004 Microchip Technology Inc.
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