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
Or
Or
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
Contact Us . . . . . . . . . . . . .11
LE180A
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
8
1.757"
Figure 3: LE180A Dimensions
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9
15
Figure 4: LE180A AUI Male Connector Pin Assignments
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LE180A
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..
45
3
2
1
6
7
8
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
1
2
3
6
Pin Pin
1
Transceiver
2
3
6
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.
1
2
10Base-T Device InputTransceiver
3
6
3
10Base-T Output Jack
6
Computer 10Base-T Port
1
Transceiver
2
Figure 5: RJ-45 Connector Pin Configuration
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