Compaq 4000N Manual De Usuario
Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
5-35
5.7
ETHERNET INTERFACE
The system board integrates an Ethernet interface that supports both 10 and 100 Mbps Ethernet
communications using IEEE 802.3 (ISO 8802-3) protocol. Two connection options are available;
an RJ-45 jack for twisted-pair Ethernet (TPE) systems (10BaseT and 100BaseTX) and an AUI
connector for a direct 10BaseT connection or to a 10Base2 connection through and AUI-to-BNC
adapter. The Ethernet interface (Figure 5-9) is based on the Texas Instruments TLAN3.1
component, which operates off the PCI bus and features auto-switching between 10 and 100 Mb/s
interfaces.
communications using IEEE 802.3 (ISO 8802-3) protocol. Two connection options are available;
an RJ-45 jack for twisted-pair Ethernet (TPE) systems (10BaseT and 100BaseTX) and an AUI
connector for a direct 10BaseT connection or to a 10Base2 connection through and AUI-to-BNC
adapter. The Ethernet interface (Figure 5-9) is based on the Texas Instruments TLAN3.1
component, which operates off the PCI bus and features auto-switching between 10 and 100 Mb/s
interfaces.
Figure 5–8. Ethernet Interface Block Diagram
The RJ-45 connctor is the default port, which is the required connection if Remote Wakeup
operation or 10/100 autosensing is desired. Note also that the LED indicators are operational
only for the RJ-45 interface. The LEDs provide the following indications:
operation or 10/100 autosensing is desired. Note also that the LED indicators are operational
only for the RJ-45 interface. The LEDs provide the following indications:
Link LED (yellow) - Indicates reception of link pulses in 10 Mbs mode, indicates scrambler lock
and valid idle code reception during 100 Mbs mode.
and valid idle code reception during 100 Mbs mode.
Active LED (green) - Indicates network activity.
The network interface controller supports Remote Wakeup using the Magic Packet method of
waking up a system unit that is powered down (the NIC logic is powered by +5 AUX, which is
active as long as the system is receiving AC line voltage). With Remote Wakeup feature enabled,
a received Magic Packet results in the PINTA- signal being asserted (low) and routed to power
control logic, which in turn activates the power supply (refer to Chapter 7, “Power and Signal
Distribution” for a discussion of the power control logic).
waking up a system unit that is powered down (the NIC logic is powered by +5 AUX, which is
active as long as the system is receiving AC line voltage). With Remote Wakeup feature enabled,
a received Magic Packet results in the PINTA- signal being asserted (low) and routed to power
control logic, which in turn activates the power supply (refer to Chapter 7, “Power and Signal
Distribution” for a discussion of the power control logic).
AUI Connector
TX/RX
RJ-45 Connector
TX/RX
TX/RX
Filter
TLAN3.1
Ethernet
Controller
PCI Bus
TX/RX
+12 VDC
PINTA-
INT Cntlr.
& Power
Control
Logic
& Power
Control
Logic
Filter
PHY
Active
(Green)
Link
(Yellow)
TX/RX,
Cntrl
Cntrl