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| 型號： | 15923 |
| 英文描述： | FDDI on Copper with AMD PHY Components The Effect of Local Buffer? 118KB (PDF) |
| 中文描述： | 與AMD的物理層組件的本地緩沖作用，銅FDDI的？ 118KB（PDF格式） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 118K |
| 代理商： | 15923 |
FDDI on Copper with AMD PHY Components
3
Cable Continuity Detection
As mentioned before IOS requires a DC path to check
cable connection between two (“master” and “slave”)
stations. The cable continuity signal is one part of “Link
Detect” status, which is comprised of both cable conti-
nuity and minimum signal level.
T1
FTP 4.0
Either one 1:1
transformer with center
taps (as shown), or two
simple 1:1 transformers
STP 150
RX
R6
6 K
R4
30 K
R5
150
+5 V
RY
R3
10 K
C4
1
C3
1
R1
75
R2
75
C1
150 p
C2
150 p
15923A-003A
Am79866
Physical
Data
Receiver
(PDR)
Figure 3. Receive Interface for Data In
Figure 4 shows the required DC path for which there are
two interoperable options. The simpler of the two solu-
tions (shown) reports continuity if at least one of the
wires in the twisted pair is connected. The second option
requires both wires to be connected in order to report
continuity, but its implementation uses more compo-
nents. For example, the second option requires two
transformers at each twisted pair end and cannot be im-
plemented with one center-tapped transformer. Both
implementation options are shown in the IOS document,
Appendix 1.
The S-port cable continuity test will signal a “high” at the
emitter output or a “l(fā)ow” at the collector output when the
cable is connected.
An M-port needs to check that the voltage across the re-
sistor is within a “window”. A low voltage indicates no
connection; a high voltage indicates a loop-back condi-
tion. In both cases cable continuity signal is “false.”
Signal Level Detection
The circuit for input signal level detection is based on a
fast comparator. In Figures 5 and 6 the comparator is
built from a 4 transistor amplifier and a peak detector. In
Figure 7, a fast IC comparator is used. Other implemen-
tations are shown in the IOS document. If the input sig-
nal level is 50 mV or more peak-to-peak, and the cable is
connected, the output level of Link Detect goes to “high”
(4 volts).
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| 1592-3 | 功能描述:電路板硬件 - PCB .113 Split fork Turret terminal RoHS:否 制造商:Harwin 類型:Shield Clip 長度:9.4 mm 螺紋大小: 外徑: 材料:Beryllium Copper 電鍍:Tin |
| 159230-2002 | 功能描述:集管和線殼 2MMHDR/15AU/30POS VSMT/CB/.112TL RoHS:否 產(chǎn)品種類:1.0MM Rectangular Connectors 產(chǎn)品類型:Headers - Pin Strip 系列:DF50 觸點(diǎn)類型:Pin (Male) 節(jié)距:1 mm 位置/觸點(diǎn)數(shù)量:16 排數(shù):1 安裝風(fēng)格:SMD/SMT 安裝角:Right 端接類型:Solder 外殼材料:Liquid Crystal Polymer (LCP) 觸點(diǎn)材料:Brass 觸點(diǎn)電鍍:Gold 制造商:Hirose Connector |
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| 15923030 | 制造商:Molex 功能描述: |
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