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HP 28685B

HEWLETT PACKARD COMPANY

HP 28685B

Card Type

Ethernet transceiver

Network Transfer Rate

10Mbps

Topology

Star

Wire Type

Unshielded twisted pair

Data Bus

AUI via DB-15 connector

CONNECTIONS

Function

Label

Function

Label

UTP connector

CN1

AUI via DB-15 connector

CN2

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Transceiver configured for maximum UTP cable length of 100 meters

SW1/1

Off

 

Transceiver configured for maximum UTP cable length of 150 meters over Cat 3 cable or 225 meters over Cat 4 cable

SW1/1

On

Loopback test mode disabled

SW1/2

Off

 

Loopback test mode enabled

SW1/2

On

Heartbeat signal enabled

SW1/3

On

 

Heartbeat signal disabled

SW1/3

Off

SQE signal enabled

SW1/4

On

 

SQE signal disabled

SW1/4

Off

Note:When the transceiver is configured for long cable lengths, it must be connected to another HP transceiver or hub which supports and is configured for this option.

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

PWR

Green

On

Power is on

PWR

Green

Off

Power is off

LINK

Green

On

Network connection is good

LINK

Green

Off

Network connection is broken

TX

Green

On

Transceiver is transmitting large amounts of data

TX

Green

Off

Transceiver is not transmitting data

TX

Green

Blinking

Transceiver is transmitting data

RX

Green

On

Transceiver is receiving large amounts of data

RX

Green

Off

Transceiver is not receiving data

RX

Green

Blinking

Transceiver is receiving data

POL

Green

On

Line polarity is normal

POL

Green

Off

Line polarity is reversed

COL

Yellow

On

UTP cable is faulty

COL

Yellow

Off

Network collision not detected

COL

Yellow

Blinking

Network collision detected