CTP100T
COAXIAL TO TWISTED PAIR
10BASE-T MEDIA ADAPTER
USER’S MANUAL
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005
NOTICE
Cabletron Systems reserves the right to make changes in specifications
and other information contained in this document without prior notice.
The reader should in all cases consult Cabletron Systems to determine
whether any such changes have been made.
The hardware, firmware, or software described in this manual is subject
to change without notice.
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY
INCIDENTAL, INDIRECT, SPECIAL, OR CONSEQUENTIAL
DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO LOST
PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON
SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR SHOULD HAVE
KNOWN, THE POSSIBILITY OF SUCH DAMAGES.
© Copyright August 1995 by:
Cabletron Systems, Inc.,
P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Part Number: 9030124-02 August 1995
CTP100T, LAN-MD, MMAC, MRXI, ST-500, TPMIM
trademarks of Cabletron Systems, Inc.
LANVIEW
and
MiniMMAC
are registered trademarks of Cabletron
Systems, Inc.
Ethernet
CompuServe
is a trademark of Xerox Corp.
is a registered trademark of CompuServe Inc.
, and
TPT-T
are
Velcro
is a registered trademark of Velcro Industries, B. V.
CTP100T USER’S MANUAL i
FCC NOTICE
This device complies with Part 15 of the FCC rules. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
NOTE:
limits for a Class A digital device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial
environment. This equipment uses, generates, and can radiate radio
frequency energy and if not installed in accordance with the operator’s
manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause
interference in which case the user will be required to correct the
interference at his own expense.
WARNING:
expressly approved by the party responsible for compliance could void
the user’s authority to operate the equipment.
This equipment has been tested and found to comply with the
Changes or modifications made to this device which are not
DOC NOTICE
This digital apparatus does not exceed the Class A limits for radio noise
emissions from digital apparatus set out in the Radio Interference
Regulations of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques
dépassant les limites applicables aux appareils numériques de la class
A prescrites dans le Règlement sur le brouillage radioélectrique édicté
par le ministère des Communications du Canada.
NOTICE:
the CTP100T adapter transceiver, SHIELDED transceiver cables must
be used.
To insure FCC and DOC compliance and proper operation of
ii CTP100T USER’S MANUAL
VCCI NOTICE
This equipment is in the 1st Class Category (information equipment to
be used in commercial and/or industrial areas) and conforms to the
standards set by the Voluntary Control Council for Interference by
Information Technology Equipment (VCCI) aimed at preventing radio
interference in commercial and/or industrial areas.
Consequently, when used in a residential area or in an adjacent area
thereto, radio interference may be caused to radios and TV receivers,
etc.
Read the instructions for correct handling
.
CPT100T USER’S MANUAL iii
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Who Should Use This Manual........................................................1-1
1.2 Structure of This Manual................................................................1-2
1.3 An Overview of the CTP100T Adapter...........................................1-2
1.3.1 Connections...................................................................1-3
1.3.2 Distance and Cable Type...............................................1-4
1.3.3 Receive and Transmit Functions ...................................1-4
1.3.4 Polarity Detection and Correction..................................1-4
1.3.5 LANVIEW LEDs.............................................................1-5
1.3.6 Application .....................................................................1-6
1.4 Related User Manuals....................................................................1-8
1.5 Getting Help...................................................................................1-8
CHAPTER 2 INSTALLATION REQUIREMENTS
2.1 Network Design Guidelines............................................................2-1
2.1.1 Twisted Pair Requirements............................................2-1
2.1.2 Coaxial Requirements....................................................2-3
CHAPTER 3 INSTALLATION
3.1 Unpacking......................................................................................3-1
3.2 Installation......................................................................................3-2
3.2.1 Surface Mounting the CTP100T Adapter.......................3-2
3.2.2 Connecting to the Network.............................................3-3
CHAPTER 4 TESTING AND TROUBLESHOOTING
4.1 Installation Checkout......................................................................4-1
4.2 Using LANVIEW.............................................................................4-4
CTP100T USER’S MANUAL v
TABLE OF CONTENTS
APPENDIX A SPECIFICATIONS
A.1 Interface Connectors................................................................. A-1
A.2 System Characteristics ............................................................. A-2
A.3 Power Specifications................................................................. A-2
A.4 Environmental Specifications.................................................... A-3
A.5 Service Specifications............................................................... A-3
A.6 Physical Specifications.............................................................. A-4
vi CTP100T USER’S MANUAL
CHAPTER 1
INTRODUCTION
Welcome to the Cabletron Systems
10BASE-T Media Adapter User’s Manual
CTP100T adapter and provides the information necessary to install,
operate, and troubleshoot it. Also included is information concerning the
application of the CTP100T adapter in a network environment.
In this manual, thin-net coaxial is also referred to as thin-net.
Read this manual thoroughly to gain a full understanding of the
CTP100T adapter and its capabilities.
CTP100T Coaxial to Twisted Pair
. This manual describes the
1.1 Who Should Use This Manual
This manual is for Cabletron Systems service personnel or other
qualified service personnel who are familiar with the installation of
network devices, and for system managers and others who perform
system management tasks.
To install the CTP100T adapter, you should have a general working
knowledge of Ethernet or IEEE 802.3 type data communications
networks and their physical layer components.
CTP100T USER’S MANUAL Page 1-1
CHAPTER 1:
INTRODUCTION
1.2 Structure of This Manual
This manual is organized as follows:
Chapter 1,
Introduction
, provides guidelines about who should use this
manual and install the CTP100T adapter, describes the CTP100T
adapter and how to apply it in a network environment, provides a list of
related user manuals, and provides information about obtaining
additional support if needed.
Chapter 2,
Installation Requirements
, contains the network and
hardware requirements to install the CTP100T adapter.
Chapter 3,
Installation
, describes how to install the CTP100T on a flat
surface and connect it to a network.
Chapter 4,
Testing and Troubleshooting
, describes the CTP100T
adapter installation checkout procedure, and the LANVIEW LEDs and
their function.
Appendix A,
Specifications,
provides the specifications for the
CTP100T adapter.
1.3 An Overview of the CTP100T Adapter
The CTP100T adapter (Figure 1-1) is a combination of Cabletron
Systems TPT and ST-500 transceivers that can convert an unshielded
10BASE-T twisted pair segment to a 10BASE-2 thin-net coaxial
segment. This capability allows network designers to interconnect
existing thin-net Ethernet devices into newly installed or existing twisted
pair wiring schemes.
The CTP100T adapter also has the Cabletron Systems LANVIEW
diagnostic system that monitors network activity and helps in quickly
diagnosing physical layer problems.
Page 1-2 CTP100T USER’S MANUAL
An Overview of the CTP100T Adapter
➊
➋
CTP100T
10BASE-2 TO 10BASE-T ADAPTER
WITH LANVIEW
POWER INPUT
10 - 15 V
800 mA MAX
LEFT
SIDE VIEW
➊
Power Receptacle
➋
RJ45 Port
FRONT VIEW
SN
➌
LNK
CLN
RC
XMT
PW
91 SERIES
➍
➍
Termination Switch
➎
BNC Port
RIGHT
SIDE VIEW
➎
01242-01
➌
LANVIEW LEDs
Figure 1-1. CTP100T Adapter
1.3.1 Connections
The CTP100T adapter has an RJ45 port and a BNC port. The twisted
pair segment is connected to the CTP100T RJ45 port. The thin-net
segment connects to the BNC port, either directly, if terminating the
segment internally, or with a T-connector, if terminating the segment
externally.
CTP100T USER’S MANUAL Page 1-3
CHAPTER 1:
INTRODUCTION
1.3.2 Distance and Cable Type
The CTP100T adapter supports an unshielded twisted pair (UTP)
segment that meets 10BASE-T requirements as described in Chapter 2.
An IEEE 802.3, 10BASE-2 compliant thin-net segment of up to 100
meters (330 feet) long can be connected to the CTP100T adapter. This
segment can support up to 10 nodes when using 50 ohm, RG-58A/U
thin-net coaxial cable.
1.3.3 Receive and Transmit Functions
In the receive function, the CTP100T adapter receives data from the
thin-net segment and routes it to the twisted pair segment. In the
transmit function, the CTP100T adapter receives data from the twisted
pair segment and routes it to the thin-net segment.
The receive function of the CTP100T adapter is disabled when data is
either being transmitted on the thin-net segment or when a collision is
detected on the thin-net segment. When a collision is detected, a jam
signal is generated and sent out to the twisted pair segment.
1.3.4 Polarity Detection and Correction
The CTP100T adapter incorporates a Polarity Detection and Correction
feature. This feature allows the CTP100T adapter to transmit and
receive data on the twisted pair link regardless of the link polarity. If the
polarity on the twisted pair link is reversed, the Link LED flashes to
indicate this condition.
Note:
CTP100T adapter and the wiring corrected. This will prevent future
problems in the event that the segment needs to be attached to a device
without the Polarity Correction and Detection feature.
If this condition exists, the segment should be removed from the
Page 1-4 CTP100T USER’S MANUAL
An Overview of the CTP100T Adapter
1.3.5 LANVIEW LEDs
The CTP100T adapter has five LANVIEW LEDs that monitor network
activity (link, collision present, receive, and transmit) and power status.
These LEDs are described in Table 1-1. They serve as a useful tool to
quickly diagnose physical layer problems.
Table 1-1. LANVIEW LEDs
LED DESCRIPTION
LNK
(green)
CLN
(red)
RCV
Link OK – On when a twisted pair link has been established between the CTP100T and the device at the
other end of the twisted pair segment.
This LED flashes when the polarity is reversed on the
twisted pair segment receive link. Regardless of this
condition, the CTP100T adapter passes the data on to
the twisted pair segment receive link. However, the
segment should be removed from the module and the
wiring corrected to avoid future problems.
Collision Present – On when there is a jabber condition.
This LED flashes when a collision signal is detected.
Receive – Flashes when the CTP100T is receiving a
(yellow)
data packet from the thin-net segment and forwarding
it to the twisted pair segment.
XMT
(green)
Transmit – Flashes when a data packet is being
transmitted on the thin-net segment.
CTP100T USER’S MANUAL Page 1-5
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