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Installation Instructions
Twisted Pair Transceiver
Catalog Number 1785-TR10BT
The twisted pair transceiver enables a de vice with an AUI interface to
connect to a 10 Mbit/s CSMA/CD LAN (ISO/IEC 8802-3, IEEE 802.3,
10BASE-T) via a shielded twisted pair cable.
•
Monitoring LEDs for
– power
– collision/jabb er control/
TxData
– RxData
– link state/auto polarity
exchange
•
SQE test can be disabled externally
•
Can be plugged directly to the device interface
•
Low current consumption
•
Compact construction
To the Installer
Topic Pa ge
Description 2
Installation 3
Compliance to European Union Directives 4
Technical Data 7
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2 Twisted Pair Transceiver
Description
The 1785-TR10BT twisted pair transceiver can be connected to the AUI
interface of a device either directly or via an AUI cable. It is connected to
the twisted pair cable by a 8-pin RJ45 socket.
The twisted pair transceiver offers these functions according to IEEE 802.3
10BASE-T:
•
indication via a LED of data transmission and reception through the
twisted pair cable
•
detection of data collisions in the network and reporting them to the
terminal equipment as well as indicating them by a LED
•
ability to enable/disable the SQE test: at the end of every transmit
operation, a short collis ion signal ( heart beat) app rox. 1 µs long is sent to
monitor the electronics
•
jabber control and d ispla y: pr otect ing t he net work form d ata pa ckets that
are too long (> 20 ms)
•
link control and display: continious moni-toring the twisted pair cable
segment with link test pulses for short-circuits or idling
•
auto polarit y exchange (APX) and display: the polarity is reversed
automatically if the receiving wire pair is connected incorreclty (RD+
and RD- switched round)
10BASE-T Interface
Jabber
Protect
Tx-Data
Tx-Packet
Detect
Link
Status
Control
(RJ45 connector)
Rx-Packet
Detect
Rx-Data
Auto Polarity
Exchange
DISABLE
ENABLE
ENABLE/
DISABLE
SQE-Test
Generator
Collision
Osc.
Loopback
Data
Rx-Data
DO
CI
AUI Interface
(15-pin sub-D connector)
DI
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Twisted Pair Transceiver 3
Installation
Link Attenuation
ISO/IEC 8802-3 (10BASE-T) specifies that the link attenuation of a single
cable segment must not exceed 11.5 dB at frequencies between 5 and 10
MHz (ZL = 100 Ω). This value includes
•
the attenuation of the twisted pair cable
•
connector attenuation
•
reflection attenuations as the result of adaption errors of the various
components belonging to the single cable segment, e.g., patch panels in
which twisted pair cables are connected to each other which, within the
scope of the tolerance, have differing characteristic impedance values at
the coupling point
Power Supply
The operating voltage (+12 V) is taken from the connected device via the
15-pin Sub-D socket of the AUI interface.
SQE Test
The slide switch on the top of the transceiver case is used to activate and
deactivate the SQE test. Before plac ing the trans ceiver in ope ration, you
should check to see whether the connected device requires the SQE test to
be on or off. As deli vered from the factory, the SQE test is on.
Connecting two devices
PC PLC5E
1785-TR10BT 1785-TR10BT
Twisted pair cable (100 Ω)
with RJ45 connectors
Connecting to an unshielded twisted pair interface card (hub, switch)
Hub
1785-TR10BT
or direct-connected to RJ45
Twisted pair cable (100 Ω)
with RJ45 connectors
1785-TR10BT
PLC5E
Pin assignments of the RJ45 to RJ45
connecting lead
RJ45 RJ45
1
2
3
6
Pin assignments of the RJ45 to RJ45
connecting lead
RJ45 RJ45
1
2
3
6
1
2
3
6
1
2
3
6
For Additional Information
For standards information, go to
copy of this publication, go to
http://www.theautomationbookstore.com/.
http://www.ieee.or g/. To download a .PDF
1785-5.20 - January 1999