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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 60/164頁(yè) |
| 文件大小： | 1173K |
| 代理商： | PSB7110 |
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_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 60
OVSP ... Overspeed Range (Valid only for transmit direction)
Number of stop bits to be deleted
0: 1 of 8
1: 1 of 4
Stop bit deletion during data transmission is initiated by a control command, otherwise all
stopbits are generated independent of OVSP setting.
It is only valid for V.14 mode and not supported for FSK V.14.
Overspeed range for the transmitter is an option that can be used to increase the data rate in
ASYNC mode by means of the overspeed mechanism that is actually defined for
compensating different data rates due to missing synchronism between an AYSNC-receiver
and transmitter.
The ISAR will just omit stopbits and therefore gain a 12.5 or 25% higher data rate.
SNP ... Stick / Normal Parity
0: normal parity
1: stick parity
EOP ... Even / Odd Parity
0: Odd parity
1: Even parity
EDP ... Enable / Disable Parity Bit
0: disable parity
1: enable parity
NSB ... Number of Stop Bits
0: 1 Stop bit
1: 2 Stop bits
CHS ... Character Size
00:
01:
10:
11:
5 bit
6 bit
7 bit
8 bit
BFT ... Buffer Flush Timeout (valid for receive direction only)
0:
1:
2:
:
254:
255:
Default value (Flush timeout = 32
symbolrate)
Flush timeout
= 2
symbolrate
= 4
symbolrate
:
= 508
symbolrate
Flush timeout disabled
The Buffer flush counter determines the length of a timer that is started when after a single character
an idle sequence is being received. This is to ensure, that ASYNC characters are indicated and
transfered to the host in case of a long idle sequence even though the message length is not yet
complete. If the timeout is disabled, the last datawords remain in the receiver buffer - even during a
long idle sequence - until the message length is complete which is then indicated to the host.
For fast data rates a value in the range BFT = 10 ... 50 is suitable, whereas for slow data rates (V.21 /
300 bps) a lower value is recommended. The BFT-value should be selected high enough to avoid a
too early buffer flush, which would increase the mailbox load.
The symbolrate refers to the selected modulation scheme which is selected for pump configuration.
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