METRObility Optical Systems Lancast 4320-12 Reference guide

USA FCC Radio Frequency Interference Statement
This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to part 15 of FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Canadian Radio Frequency Interference Statement
This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du
Réglement sur le matériel brouilleur du Canada.
Disposal Statement
This product shall be handled, stored and disposed of in accordance
with all governing and applicable safety and environmental regulatory
agency requirements.
Lancast is a registered trademark of METRObility Optical Systems,
Inc. DECnet is a trademark of Digital Equipment Corporation.
The information contained in this document is assumed to be correct
and current. The manufacturer is not responsible for errors or
omissions and reserves the right to change specifications at any time
without notice.
© 2000 METRObility Optical Systems, Inc. All rights reserved.
Printed in USA.
Quick Reference Card
Model 4320-12
25 Manchester Street, Merrimack, NH 03054 USA
tel: [phone] • fax: [phone]
www.metrobility.com
5660-432012 C
8/01
Lancast®
10Mbps Twisted-Pair
Micro Transceiver

Introduction
The Lancast 4320-12
Twisted-Pair Micro
Transceiver is a highly
compact adapter for direct
connection of Ethernet-
based computers,
servers,
workstations and
other peripherals to
any ThinNet coaxial
network. Its small size combined with the convenient
location of its connectors lets you install the transceiver
in places with extremely tight space requirements.
Installation
The transceiver mounts directly to the Ethernet card
currently installed in your system or server (DTE) via
the 15-pin D-type connector. In situations where it is
not possible to connect directly to the Ethernet card,
an AUI cable may be used to connect the transceiver
to the Ethernet card. A shielded RJ-45 connector
provides an interface to the network using either a
shielded or an unshielded twisted-pair cable.
SQE Switch
The transceiver accommodates a wide variety of
network configurations through the user-selectable
Signal Quality Error (SQE) function. A simple ON/
OFF switch allows you to activate or deactivate the
SQE function. If you turn ON the SQE function, the
transceiver will send a short collision signal to the
attached network device at the end of each packet
which it transmits.
All IEEE 802.3 installations require the SQE to be ON.
However, if you are installing the transceiver into a
DECnet™environment or using it in conjunction with a
repeater, the SQE must be OFF.Arepeater will regenerate
the data signal and pass it from one cable segment to the
next, where it will be interpreted as a collision signal.
Similarly,devices on a DECnet environment will interpret
the SQE signal as acollision. The misinterpretation will
mean poor network performance.
IMPORTANT: The Lancast 4320-12 Micro Transceiver
is shipped from the factory with the SQE set to OFF.
Operation and LED Indicators
Seven integral LED indicators provide visible
verification of transceiver activity and satisfactory
device connection. When illuminated these LEDs
indicate the following:
POL (POLARITY) The polarity of the incoming
twisted-pair receive data link is reversed;
the transceiver automatically corrects it
internally.
LINK A valid link has been verified.
TX* (TRANSMIT) Pulses when transmitting
information; output lead.
RX* (RECEIVE) Pulses when receiving
information; input lead.
PWR (POWER) The unit is ON and receiving
power from the attached DTE device.
COL (COLLISION) Data is simultaneously
detected on both the TX and RX leads.
JAB (JABBER)A frame greater than 1518 bytes
is being transmitted.
*NOTE: The frequency and duration of the pulse
on the TX and RX LEDs will vary according to the
length and frequency of the packets being
transmitted. Long packets will cause the LEDs to
appearpermanently ON, while short packets will
cause the LEDs to blink.
Warning: Changes or modifications to this unit not
expressly approved by the party responsible for
compliance could void the user’s authority to
operate the equipment.