Allied Telesis AT-MC12T User Manual
The CentreCOM
AT-MC12T
Media Converter User’s Guide
Overview
The Allied Telesyn AT-MC12T is used in addition to a transceiver
(MAU) to convert another Ethernet physical layer to 10BASE-T. It is
connected to a transceiver of the required conversion type. The
power adapter supplies power to the AT-MC12T and to the attached
transceiver.
Table 1: Possible Media Conversion
Transceiver (MAU) Conversion Type
MC12T MX40F, MX55F, MX50
(10BASE-FL MAU)
MC12T MX10S
(10BASE2 MAU)
MDI/MDI-X Switch
The MDI/MDI-X switch located on the side of the unit, is a straightthrough crossover cable selection switch. It enables the 10BASE-T
(RJ45) port to be connected to a repeater or to a DTE without using a
special crossover cable.
The default setting of the switch is MDI-X, which means you can
connect the 10BASE-T port to a workstation or to any other DTE that
uses a straight-through cable. In the MDI configuration, slide the
switch to the MDI side and you can connect the 10BASE-T port to a
repeater/hub/concentrator using a straight-through cable.
UTP—Fiber Optic
UTP—Thin Coax
10BASE-T
REPEATER
or 10BASE-T
WORKSTATION
AT-MC12T AT-MX
Figure 1:
Typical Configuration
NODE
NODE
NODE
Table 2: RJ45 Pinout
RJ45—MDI Pinout RJ45—MDI-X Pinout
Pin Signal Pin Signal
1 TD+ 1 RD+
2 TD- 2 RD3 RD+ 3 TD+
6 RD- 6 TD4, 5, 7, 8 N/A 4, 5, 7, 8 N/A
NOTE
The transceiver (MAU) attached at the AUI connector must have the
SQE (heartbeat) test disabled for proper operation.
LED Explanation
There are four LEDs next to the 10BASE-T port of the MC12T
Table 3: LED Guide
LED Name Meaning When LED Is Lighted
PWR Indicates power is applied
LNK Indicates link is established
ACT Indicates data is received on RJ45 or AUI port
COL Indicates a collision is detected on RJ45 or AUI
Power Requirements
The AT-MC12T draws power from the wall-mount AC-DC power
adapter attached at its DC jack. ATI supplies the TUV/UL/CSA
licensed safety compliant AC power adapter for the 120 and 240 VAC
versions with an unregulated output of 12 VDC at 1A. The power
required for the AT-MC12T is:
Installing the AT-MC12T
1. Choose the correct switch settings for the AT-MC12T and the
attached transceiver.
2. Make sure that the SQE test is OFF.
3. Plug the AT-MC12T onto the 15-pin male connector on the
transceiver or on the AUI cable.
4. Slide the connector latch in place.
5. Connect the power adapter to the AT-MC12T and then to an AC
outlet.
port
12 to 18 VDC, 700 mA
Warranty
The AT-MC12T Media Converter has a lifetime warranty. The power
supply has a one year warranty.
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