參數(shù)資料
型號: PSB7110
廠商: SIEMENS AG
英文描述: Enhanced ISDN Data Access Controller ISAR
中文描述: 增強(qiáng)綜合業(yè)務(wù)數(shù)字網(wǎng)的數(shù)據(jù)接入控制器專家組
文件頁數(shù): 58/164頁
文件大?。?/td> 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 58
3.4.2
SART Configuration Setup - ASYNC (Host
ISAR)
ASYNC denotes an asynchronous formatting of data according to ITU-T V.14. Two separate modes
are distinguished for ASYNC which depends on the selected modulation scheme at the data pump
7
6
5
4
3
2
1
0
DPS
MSC
MDS
HIS
1
0
0
1
0
1
15
14
13
0
12
0
11
10
9
8
CTRL MSB
HDMC
SMODE
7
6
5
4
3
2
1
0
CTRL LSB
2
7
0
6
5
4
3
2
1
0
1. Parameter
OVSP
SNP
EOP
EDP
NSB
CHS
7
6
5
4
3
2
1
0
2. Parameter
BFT
DPS ... Datapath selection
01:
10:
path 1
path 2
HDMC ... Halfduplex Mode Configuration
00:
01:
10:
11:
Receive and transmit channels are enabled (default)
Receive channel is disabled
Transmit channel is disabled
not used
In halfduplex mode the pump would transfer idle bits in the direction that is currently not in
use, so the corresponding receive or transmit channel can be selectively disabled to reduce
the interrupt load for not valid data.
For all other pump modes except halfduplex mode, HDMC must be set to its default value 00.
SMODE ... SART Mode
0000:
0010:
0011:
0100:
0101:
all other codes reserved
Disable SART
V.14 mode (used for pump modes V.110, V.32, V.32bis, V.22, V.22bis)
HDLC mode
Binary mode
FSK V.14 mode (used for pump modes V.21, V.23, Bell 103, Bell 202)
There is a difference in the pump modes FSK V.14 and V.14:
For FSK V.14 the bit alignment during an idle sequence gets lost, since there is only one
frequency for the mark bit and therefore there's no fixed baud rate at the data pump during
the idle sequence.
For V.14 mode there is a data stream that has a fixed bit alignment, since the modulation
scheme provides a fixed baud rate even during idle sequence.
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