Allied Telesyn International

CentreCOM
AT-210T and AT-210TS
10BASE-T Micro Transceiver User Manual

Overview

The Micro Ethernet Transceiver Series of products are direct-attach IEEE 802.3 and
Ethernet Version 1.0 and 2.0 devices. ATI supports all common Ethernet media with
Micro Transceivers for thin coax (10BASE2), UTP (1OBASE-T) and Fiber Optic
(10BASE-FL, FOIRL) LAN systems. The transceivers support a single AUI that
attaches directly to the AUI 15-pin connection found on most Ethernet stations
(DTEs). Direct AUI connection reduces cabling costs for the installer.

All ATI transceivers are equipped with LEDs providing status and diagnostic information. 
LEDs make LAN installation and troubleshooting easy for the installer. 
An easily accessible, user-selectable SQE Test switch (heartbeat) is also provided on all models.

ATI uses quality product packaging for increased reliability. ATI shows a high level
of confidence in these micro transceiver products which come with a 5 year warranty.

Preparation

An SQE Test switch is available to provide IEEE 802.3 Ethernet SQE Testing. If
required, place the SQE Test switch to the "ON" position. An illuminated LED indicates
the SQE Test is enabled. If the DTE does not require an SQE Test, or if the DTE is a
repeater, place SQE Test switch to "OFF." The SQE Test is disabled when the LED is
off. Disable the heartbeat function by turning the SQE Test switch "OFF" when the
Ethernet MAU is connected to a repeater to eliminate the possibility of excessive collisions.

Installation

The AT-210T or AT-210TS connects directly to a DTE or workstation AUI connector.
The AT-210TS, the slim-line version, includes a connector extension for tight installations.

Plug the transceiver into the 15-pin AUI connection on the DTE and slide the
connector latch into place. Power on the DTE and verify that the Power indicator is lit.

Check to ensure the SQE Test setting is appropriate for equipment per the above
requirements. Plug a UTP cable into the RJ45 receptacle located on the AT-210T
transceiver. Check the Link LED to ensure equipment on the other end of link is operational.

Stations will communicate if both local and remote transceivers' Link LEOs
are on. Four LEDs provide Link, SQE status, Polarity and Power information. If
another 10BASE-T MAU is at the opposite end of the line, the UTP cabling must be
crossed, i.e., TD+ and TD- signals must be swapped with AD+ and RD- signals
respectively. If the Polarity LED is lit, no polarity correction is occurring. 
If the Polarity LED is OFF, the polarity of RD+ and RD- are being swapped internally by the transceiver.

26 to 22 AWG (0.4 - 0.6mm) UTP cable with 100 ohm impedance is required.
Level 3 or better cable should be used. IEEE 802.3 Specifications: 1OOm (328 ft.)
maximum UTP cable link segment.