Intel 21143 manual AUI 10BASE2 Network Connection, Design Guide, auitd, auibnc

Intel® 21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller

Figure 9 shows the AUI 10BASE2 network connection. In this configuration, the AUI is not externally exposed. The required components for this configuration are as follows:

•Isolation transformer

•Terminating and decoupling components

•DC-to-DC converter

•Coaxial transceiver and BNC connector

Figure 9. AUI 10BASE2 Network Connection

21143			Isolation
			Transformer
			ST7032
aui_rd+ 139			10	7	XFMR_RD+
0.01 ∝ F	40.2	Ω			511 Ω
Receive
Path	40.2 Ω
GND				8	XFMR_RD-
			9
aui_rd- 140					511 Ω
aui_cd+ 137			13	4	XFRM_CD+
0.01 ∝ F	40.2	Ω			511 Ω
Collision
Path	40.2	Ω
GND			12	5	XFRM_CD-
aui_cd- 138					511 Ω
18 Ω			16	1	XFMR_TD+
aui_td+ 142
47 Ω	22 pF				40.2 Ω
Transmit
Path	511				40.2 Ω
GND	Ω			2
			15
aui_td- 143					XFMR_TD-
18 Ω

aui_bnc 100

Coaxial

Transceiver

NE8392

Receive

Collision

Transmit

Coaxial

1 k Ω

+12 V		2		-9 V		1 MΩ
	3	Enable	8
22 ∝ F		dc-to-dc		0.1 ∝ F		0.75 pF (1000 V)
		Converter		1000 pF
0.1 ∝ F	1	80Z1209	7			1000 pF (1000 V)
		4700 pF			GND

GND

Note:

Refer to the vendor data sheet for the specific implementation of the coaxial transceiver (NE8392).

LJ-05145.WMF

In cases where 10BASE2 MAU is a module separate from the board, MAU can be implemented on a small add-in card. Ensure that the cable used to connect the board to MAU provides adequate shielding of the AUI signals from external noise. This MAU add-in card includes the following components:

•Transceiver chip and BNC connector

•DC-to-DC converter

•Discrete devices

Design Guide 17