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參數(shù)資料
| 型號： | DS21Q44T |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 中文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 文件頁數(shù)： | 41/105頁 |
| 文件大小： | 620K |
| 代理商： | DS21Q44T |
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DS21Q44
41 of 105
Code violations are defined as consecutive bipolar violations of the same polarity. In most applications,
the framer should be programmed to count BPVs when receiving AMI code and to count CVs when
receiving HDB3 code. This counter increments at all times and is not disabled by loss of sync conditions.
The counter saturates at 65,535 and will not rollover. The bit error rate on a E1 line would have to be
greater than 10** –2 before the VCR would saturate.
VCR1: UPPER BIPOLAR VIOLATION COUNT REGISTER 1
(Address=00 Hex)
VCR2: LOWER BIPOLAR VIOLATION COUNT REGISTER 2
(Address=01 Hex)
(MSB)
V15
V7
(LSB)
V8
V0
V14
V6
V13
V5
V12
V4
V11
V3
V10
V2
V9
V1
VCR1
VCR2
SYMBOL
V15
V0
POSITION
VCR1.7
VCR2.0
NAME AND DESCRIPTION
MSB of the 16–bit code violation count
LSB of the 10–bit code violation count
CRC4 Error Counter
CRC4 Count Register 1 (CRCCR1) is the most significant word and CRCCR2 is the least significant
word of a 10–bit counter that records word errors in the Cyclic Redundancy Check 4 (CRC4). Since the
maximum CRC4 count in a one second period is 1000, this counter cannot saturate. The counter is
disabled during loss of sync at either the FAS or CRC4 level; it will continue to count if loss of
multiframe sync occurs at the CAS level.
CRCCR1: CRC4 COUNT REGISTER 1
(Address=02 Hex)
CRCCR2: CRC4 COUNT REGISTER 2
(Address=03 Hex)
(MSB)
(note 1)
CRC7
(LSB)
CRC8
CRC0
(note 1)
CRC6
(note 1)
CRC5
(note 1)
CRC4
(note 1)
CRC3
(note 1)
CRC2
CRC9
CRC1
CRCCR1
CRCCR2
SYMBOL
POSITION
NAME AND DESCRIPTION
CRC9
CRC0
CRCCR1.1
CRCCR2.0
MSB of the 10–Bit CRC4 error count
LSB of the 10–Bit CRC4 error count
Note:
1.
The upper six bits of CRCCR1 at address 02 are the most significant bits of the 12–bit FAS error
counter.
E–Bit Counter
E–bit Count Register 1 (EBCR1) is the most significant word and EBCR2 is the least significant word of
a 10–bit counter that records Far End Block Errors (FEBE) as reported in the first bit of frames 13 and 15
on E1 lines running with CRC4 multiframe. These count registers will increment once each time the
received E–bit is set to zero. Since the maximum E–bit count in a one second period is 1000, this counter
cannot saturate. The counter is disabled during loss of sync at either the FAS or CRC4 level; it will
continue to count if loss of multiframe sync occurs at the CAS level.
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PDF描述 |
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| DS21Q44TN | MICROSWITCH, SPDT, SIM ROLLER LEVER; Current, contact AC:5A; Force, operating:91.75gf; Travel, pre:16.0mm; Centres, fixing LxW:22.2mm; Temp, op. max:120(degree C); Temp, op. min:-40(degree C); Length / Height, external:9.25mm; Width, RoHS Compliant: Yes |
| DS2251T-128-16 | CONNECTOR ACCESSORY |
| DS2251T-32-16 | 128k Soft Microcontroller Module |
| DS2251T-64-16 | CONNECTOR ACCESSORY |
| DS2251 | 128k Soft Microcontroller Module |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS21Q44T+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Enhanced Quad E1 Framer RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q44TN | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q48 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 5V Quad E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q48A3N | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 5V Quad E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q48B | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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