Black Box LE180A User Manual

NETWORK SERVICES

LE180A 10Base-T Transceiver

• Stand-Alone model

• Attached Unit Interface (AUI) to Ethernet RJ-45 connectors

• No external power requirement

The LE180A transceiver is a media access unit (MAU) that connects the AUI port of data terminal equipment, repeaters, or other

network devices either directly or through an AUI cable to an Ethernet 10BASE-T device. The Ethernet device is connected to the transceiver through an unshielded or shielded twisted-pair copper cable with RJ-45 connector ends.

Various System Configurations

Figure 1 shows various examples of transceiver system configurations.

10-Base-T Hub

Workstation

Black Box

Transceiver

Black Box

Transceiver

Workstation

Black Box

Transceiver

HUB with AUI Port

Figure 1: Transceiver System Configurations

General Description . . . . . . .2

Connectors & Cables . . . . . . .3

Installation . . . . . . . . . . . . . .6

Operations . . . . . . . . . . . . . .8

Technical Specifications . . . .9

Cable Specifications . . . . . .10

Troubleshooting . . . . . . . . .10

LE180A

General Description

The LE180A IEEE802.3 compliant Ethernet transceiver uses 10Mbps Ethernet CSMA/CD protocol to provide a connection interface to 10Base-T Ethernet unshielded twisted-pair (UTP) cables. The transceiver connects to the AUI connector of an Ethernet device via standard AUI cable.

Figure 2: shows the front and rear panels of the LE180A transceiver.

Rear

AUI Connector

Front

RJ-45 Connector

Figure 2: LE180A Transceiver Front and Rear Panels

Dimensions

Figure 3 shows the LE180A dimensions.

3.141

4 LEDs

0.812"

3-Pos itio Switch

LE180A Features

• Provides a complete interface of the AUI to Ethernet UTP cable.

• Supports 10Mbps data transfer rates.

• Supports Carrier Sense Multiple Access/Collision Detection (CSMA/CD) contention protocol.

• Drives UTP cable segments up to 100 meters (328ft).

• Supports selectable link and SQE test functions.

• Supports direct connections to host AUI ports.

• Detects and corrects reverse polarity on the receiving pair of UTP cables.

• Provides four LEDs: Transmit (TX), Receive (RX), Collision, and Status.

Connectors and Cables

LE180A AUI male connector

AUI D-sub 15-pin male connector accommodates AUI drop cables (50 meters max.). The AUI connector is used to connect the transceiver to the AUI port of an Ethernet device such as an Ethernet MAC controller, a repeater, or a hub via an AUI drop cable. The AUI connector is shown in Figure 4. The AUI male connector pin assignments are show in Table 1.

D-Sub 15-pin Male AUI Connector

1.757"

Figure 3: LE180A Dimensions

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Figure 4: LE180A AUI Male Connector Pin Assignments

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LE180A

Connectors & Cables -- Continued

AUI connector -- continued

Table 1: AUI Male Connector Pinouts

Pin Name Pairs Use

3 DO + Transmit Data Out +

10 DO - Pair Data Out -

11 DO S Data Out Shield

5 DI + Receive Data In +

12 DI - Pair Data In -

4 DI S Data In Shield

7 CO + Option Control Out +

15 CO - Pair Control Out -

8 CO S Control Shield

2 CI + Collision Control In +

9 CI - Pair Control In -

1 CI S Control Shield

6 VC Power Voltage Common

13 VP Pair Voltage Plus

14 VS Voltage Shield

UTP cable (RJ-45 connector)

The 10Base-T, RJ-45 out jack is used to connect a 10Base-T Ethernet device via a 2-pair UTP cable. (Use category 3, 4, or 5 UTP cable.) The length of the UTP cable can be up to 100m (328ft).

The RJ-45 connector pin configuration is shown in Figure 5. The pin assignments are show in the Table 2..

Connectors & Cables -- continued

UTP cable (RJ-45 connector) -- continued

Table 2: RJ-45 Pin Assignments

Pin Out Jack Assignments

1 Outgoing Data 1 (+)

2 Outgoing Data 2 (-)

3 Incoming Data 1 (+)

4 Not connected

5 Not connected

6 Incoming Data 2 (-)

7 Not connected

8 Not connected

Wiring schemes for UTP cable and devices

How to install the UTP cable is determined by the characteristics of the 10Base-T UTP port of the other device. The following shows some pinning examples:

UTP Cable Pin Wiring

Pin Pin

Transceiver

Note: The device 10Base-T output jack is normally used to connect to another

10Base-T device. The vendor's 10Base-T device sometimes provides a crossover option to set the jack as an input jack for connecting to a 10Base-T Ethernet station.

10Base-T Device InputTransceiver

 10Base-T Output Jack

 Computer 10Base-T Port

 Transceiver

Figure 5: RJ-45 Connector Pin Configuration

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