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參數(shù)資料
| 型號： | DS2180A |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | T1 Transceiver(T1收發(fā)器) |
| 中文描述： | DATACOM, FRAMER, PDIP40 |
| 封裝： | 0.600 INCH, DIP-40 |
| 文件頁數(shù)： | 25/35頁 |
| 文件大?。?/td> | 232K |
| 代理商： | DS2180A |
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DS2180A
022798 25/35
193S FRAMING FORMAT
Table 8
FRAME
NUMBER
F-BIT USE
BIT USE IN EACH CHANNEL
SIGNALING-BIT USE
F
T1
F
S2
DATA
SIGNALING
4
1
2
3
4
5
6
7
8
9
10
11
12
1
–
0
–
1
–
0
–
1
–
0
–
–
0
–
0
–
1
–
1
–
1
–
0
3
BITS 1–8
BITS 1–8
BITS 1–8
BITS 1–8
BITS 1–8
BITS 1–7
BITS 1–8
BITS 1–8
BITS 1–8
BITS 1–8
BITS 1–8
BITS 1–7
BIT 8
BIT 8
A
B
NOTES:
1. F
T
(terminal framing) bits provide frame alignment information.
2. F
S
(signaling frame) bits provide multiframe alignment information.
3. The S-bit in frame 12 may be used for yellow alarm transmission and detection in some applications.
4. The user may program any individual channels clear, in which case bit 8 will be used for data, not signaling.
Line Coding
T1 line data is transmitted in a bipolar alternative mark
inversion line format; 1’s are transmitted as alternating
negative and positive pulses and 0’s are simply the ab-
sence of pulses. This technique minimizes DC voltage
on the T1 span and allows clock to be extracted from
data. The network currently has a 1’s density constraint
to keep clock extraction circuitry functioning which is
usually met by forcing bit 7 of any channel consisting of
all 0’s to 1. The use of Bipolar Eight Zero Substitution
(B8ZS) satisfies all the 1’s density requirement while al-
lowing data traffic to be transmitted without corruption.
This feature is known as clear channel and is explained
more completely in ATT C.B. #144. When the B8ZS fea-
ture is enabled, any outgoing stream of eight consecu-
tive 0’s is replaced with a B8ZS code word. If the last 1
transmitted was positive, the inserted code is 000+-0-+;
if negative, the code word inserted is 000-+0+-. Bipolar
violations occur in the fourth and seventh bit positions
which are ignored by the DS2180A error monitoring log-
ic when B8ZS is enabled. Any received B8ZS code word
is replaced with all 0’s if B8ZS is enabled. Also, the re-
ceive status register will report any occurrence of B8ZS
code words to the host controller. This allows the user to
monitor the link for upgrade to clear channel capability
and respond to it. The B8ZS monitoring feature works at
all times and is independent of the state of CCR.2.
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| DS2180A+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC T1 Transceiver 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2180AN | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC T1 Transceiver 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2180AQ | 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2180AQ/T&R | 制造商:Maxim Integrated Products 功能描述:T1 TRANSCEIVER-PLCC-TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC TRANSCEIVER T1 44-PLCC 制造商:Maxim Integrated Products 功能描述:Network Controller & Processor ICs T1 Transceiver |
| DS2180AQ/T&R+ | 制造商:Maxim Integrated Products 功能描述:T1 TRANSCEIVER PLCC TRL LF - Tape and Reel |
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