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| 型號： | 21582 |
| 英文描述： | Gigabit Ethernet Physical Layer GigaPHY-SD Device Design Considerations? 49.2KB (PDF) |
| 中文描述： | 千兆以太網(wǎng)物理層GigaPHY - SD設(shè)備設(shè)計考慮？ 49.2KB（PDF格式） |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 49K |
| 代理商： | 21582 |
Design Considerations for the Am79761 Gigabit Ethernet Physical Layer GigaPHY-SD Device
3
Figure 2.
Termination Example: 50-
Single-Ended
Single-Ended, 75-
This is a Gigabit Ethernet-compatible application which
is similar to the previous example. However, in this ex-
ample, the pull down resistors R1=R2=267
of 182
to match the 75-
the coaxial cabling and connectors are different in
order to meet the 75-
impedance required by Gigabit
Termination
,
instead
transmission lines. Also,
Ethernet. The connector of the transmit side is a 75-
BNC (female on the board, male on the cable). The
connector on the receive side is a 75-
the board, male on the cable). The shell of the BNC is
grounded, but the TNC shell is left open. These mis-
matched connectors provide built-in polarization. The
typical circuit for this application is shown in Figure 3.
TNC (female on
Figure 3.
Termination Example: 75-
Single-Ended
Differential, 150-
A more popular Gigabit Ethernet-compatible applica-
tion is for 150-
differential signals using 9-pin D-
Subminiature connectors (also known as DB-9) and
duplex twinax cable. This provides better signal quality,
longer transmission distance, and reduced emissions
as compared to single-ended configurations. Both out-
puts from the transmitter are terminated with 267-
downs. One percent components are used to maintain
a balanced load between the two differential outputs.
On the receive side, a single 150-
sistor is used for impedance matching. This is located
Twinax Termination
pull
line termination re-
on the receiver side of the AC-coupling capacitors
since this resistor will not affect the DC bias circuit. The
connector for this application is a 9-pin D-Subminiature
(female on the board, male on the cable) with TX+ on
pin 1, TX- on pin 6, RX+ on pin 5, and RX- on pin 9. The
shield of the cable is connected to chassis ground on
both ends to provide a low impedance grounded shield.
A cost-effective duplex twinax cable having an effective
shielding scheme that reduces emissions to the point
that systems pass the FCC-B and CISPR EMI levels is
available from W. L. Gore. The typical circuit for this ap-
plication is shown in Figure 4.
TX
RX
C1
R1
C2
R2
SMA
SMA
C3
R3
C4
R1=R2=182
, 1%
C1=C2=C3=C4=0.01
μ
F
R3=51.1
, 1%
50-
Coax
21582B-2
TX
RX
C1
R1
C2
R2
BNC
(Female)
TNC
(Female)
C3
R3
C4
R1=R2=267
, 1%
C1=C2=C3=C4=0.01
μ
F
R3=75
, 1%
75-
Coax
21582B-3
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