Cabletron Systems Computer Accessories THN MIM User Manual

COAXIAL MEDIA INTERF ACE  
MODULE (THN-MIM)  
INSTALLATION GUIDE  
The Co m p le te Ne two rking So lutio n™  
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-0505  
 
NOTICE  
F CC NOTICE  
This device complies with Part 15 of 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: This equipment has been tested and found to comply with the  
limits for a Class A digital device, pursuant to Part 15 of 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 operators  
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 at his own expense  
to correct the interference.  
If this equipment does cause interference to radio or television, 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:  
• Re-orient the receiving antenna.  
• Relocate the equipment with respect to the receiving antenna.  
• Move the equipment away from the receiver.  
Plug the equipment into a different outlet so that the equipment and  
the receiver are on different branch circuits.  
If necessary, the user should consult the dealer or an experienced  
radio/ television technician for additional suggestions. The user may  
find the following booklet prepared by the Federal Communication  
Commission helpful:  
How to Identify and Resolve Radio TV Interference Problems”  
This booklet is available from the U.S. Government Printing Office,  
Washington D.C. 20402 - Stock No. 004-000-00345-4.  
ii  
 
CONTENTS  
TABLE OF CONTENTS  
CHAP TER 1 INTRODUCTION  
1.1 INTRODUCTION ........................................................................ 1-1  
1.2 USING THIS MANUAL .............................................................. 1-2  
1.3 SPECIFICATIONS ...................................................................... 1-2  
1.4 RELATED USER MANUALS ..................................................... 1-4  
CHAP TER 2 INSTALLATION  
2.1 INTRODUCTION ........................................................................ 2-1  
2.2 NETWORK DESIGN GUIDELINES.......................................... 2-1  
2.2.1 Thin-net Segments.............................................................. 2-1  
2.2.2 Thin-net Segments (THN-MIM7593 only) ........................ 2-2  
2.2.3 Thick-net Segments ............................................................ 2-3  
2.3 INSTALLATION .......................................................................... 2-4  
CHAP TER 3 TESTING AND LANVIEW  
3.1 INTRODUCTION ........................................................................ 3-1  
3.2 INSTALLATION CHECK-OUT .................................................. 3-1  
3.3 USING LANVIEW ....................................................................... 3-2  
iii  
 
CONTENTS  
iv  
 
INTRODUCTION  
CHAP TER 1  
INTRODUCTION  
1.1 INTRODUCTION  
Cabletron Systems Coaxial Media Interface Module (THN-MIM)  
provides 12 Ethernet/lEEE 802.3 coaxial cable connectors per module.  
When used with the MMAC-8enclosure, up to 84 coaxial segments  
can be connected to one MMAC.  
The THN-MIM can be mixed with other Media Interface Modules to  
provide a variety of different media connections. This means that you  
can use a combination of twisted pair, fiber optic, and coaxial cabling  
from one MMAC.  
Each port on the THN-MIM is repeated by the Intelligent Repeater  
Module (IRM). This feature assures data integrity and maximum data  
path distance by regenerating and re-timing data packets each time  
they enter the MMAC. This feature also assures fault isolation since  
the MMAC will segment problem ports from the network  
automatically. If a port is segmented, the port will be reconnected  
automatically to the network once the port has received a valid data  
packet.  
Either thick or thin Ethernet cable can be connected to the THN-MIM.  
Thin-net cable segments, using 50 ohm Ethernet type cable, can be  
connected directly to the module. Each of these segments can be up to  
185 meters in length and can support up to 29 users.  
Thick-net cable segments made of 50 ohm Ethernet type cable can also  
be connected to the modules. A BNC to N-Series adaptor must be used  
to convert the thick-net cable to a thin-net cable. Each thick-net  
segment can be up to 500 meters in length and can support up to 99  
users.  
If 12 thick-net segments are connected to a THN-MIM, up to 6000  
meters of cable supporting 1024 host systems can be attached to that  
one module.  
Another model, the THN-MIM7593 is designed for use with 75 or 93  
ohm coaxial cable. Thin-net cable segments, using 75 or 93 ohm cable,  
Page 1-1  
 
INTRODUCTION  
can be connected directly to the module. Each of these segments  
supports one device.  
The entire THN-MIM or each port on the MIM can be controlled via the  
IRM in your MMAC. The IRM can be accessed directly through a  
console port on the front panel or be controlled and managed in-band  
using Cabletron Systems Remote LANVIEW/Windows,  
SPECTRUM®, or SNMP compliant network control management  
software.  
Each port on the THN-MIM has two LANVIEW® LEDs, the Port OK  
(POK) LED and the Receive (RCV) LED. The POK LED remains lit as  
long as the port is connected to the network. If a port is segmented from  
the network, the LED will not be lit. The RCV LED will be lit when  
activity is detected on the segment. These LEDs help diagnose physical  
layer problems as they arise.  
1.2 USING THIS MANUAL  
This manual provides instructions on installing the THN-MIM into  
the MMAC, attaching coaxial segments to the MIM, and testing those  
segments after they have been attached to the MIM.  
This manual assumes that the user has a general working knowledge  
of Ethernet, and of IEEE 802.3 type data communications networks  
and their physical layer components.  
If additional support is needed related to the Cabletron Systems  
THN-MIM, or if you have any additional comments, improvements,  
suggestions, or questions, feel free to contact Cabletron Systems  
Technical Support at:  
Cabletron Systems  
P.O. Box 5005  
Rochester, NH 03867-0505  
Phone: (603) 332-9400  
1.3 SP ECIF ICATIONS  
Listed below are the specifications for the Cabletron Systems  
THN-MIM.  
Page 1-2  
 
INTRODUCTION  
NOTE: Cabletron Systems reserves the right to change these  
specifications at any time without notice.  
BNC INTERF ACE (P or ts 1-12)  
Type:  
BNC receptacle, with gold center contact,  
for use with BNC type plugs and RG-58  
thin-net cable.  
Internal Transceiver:  
Cabletron Systems TMS-3 Transceiver.  
For further information, refer to the  
TMS-3 Transceiver User's Manual.  
Terminations:  
Grounding:  
Each segment is internally connected to a  
50 ohm terminator in the port.  
Each segment connector shield is  
internally connected to earth ground by the  
THN-MIM. This eliminates the need for  
grounding the segments connected to the  
BNC ports.  
INDICATORS  
P OK  
Indicates that the port is connected to the  
network.  
When the module is first installed into the  
MMAC, the LED will not be lit until the  
first data packet passes through the port.  
RCV  
Indicates that the module is receiving a  
data packet from that segment.  
ENVIRONMENTAL REQUIREMENTS  
Operating temperature: +5 to +40 C  
Non-operating temperature: -30 to +80 C  
Operating humidity: 5 to 95% (non-condensing)  
Page 1-3  
 
INTRODUCTION  
SAF ETY  
WARNING: It is the responsibility of the person who sells the system of  
which the THN-MIM will be a part, to ensure that the total system meets  
allowed limits of conducted and radiated emissions.  
Designed in accordance with UL478, UL910, NEC 725-2(b), CSA, IEC,  
TUV, VDE class A. Meets FCC part 15, Class A limits.  
SERVICE  
MTBF (MHBK-217D):  
MTTR:  
>156,462 hr. predicted  
<0.5 hr.  
P HYSICAL  
Dimensions:  
Weight:  
13.4 D x 11.5 H x 2 W inches  
2 lbs.  
1.4 RELATED USER MANUALS  
The manuals listed below should be used to supplement the procedures  
and other technical data provided in this manual. The procedures  
contained in these manuals will be referenced, rather than repeated in  
this manual.  
Cabletron Systems TMS-3 Tr a n sceiver User's Manual  
Cabletron Systems LAN-MD P or ta ble Eth er n et Tester User's  
Manual  
Page 1-4  
 
INSTALLATION  
CHAP TER 2  
INSTALLATION  
2.1 INTRODUCTION  
The Cabletron Systems THN-MIM is designed for quick and easy  
installation into an MMAC. No special skills or tools are required to  
install this module.  
2.2 NETWORK DESIGN GUIDELINES  
The following network design guidelines must be followed when  
connecting segments to the THN-MIM. If not, unsatisfactory network  
performance may result.  
2.2.1 Th in -n et Segm en ts  
This applies to the THN-MIM only. For the THN-MIM7593, see  
section 2.2.2.  
50 ohm RG-58A/U type coaxial cable must be used when making up  
a thin-net cable segment. A 50 ohm terminator must be connected  
to the far end of the thin-net segment.  
A maximum of 30 connections may be made to a thin-net cable  
segment. These connections must be at least 0.5 meter apart.  
For safety, only one end of a thin-net segment should be connected  
to earth ground. Connection to earth ground at more than one point  
on the segment may allow for the occurrence of dangerous ground  
currents. The BNC ports of the THN-MIM are connected to earth  
ground. This eliminates the need of grounding the thin-net  
segments connected to the module.  
Connections on a thin-net cable segment to host systems or  
transceivers are made by BNC tee connectors. The male end of the  
BNC tee connector is used to connect directly to the host or to the  
transceiver. The female ends of the tee connector must be  
connected to another part of the segment or to a terminator.  
Page 2-1  
 
INSTALLATION  
Since the ports on the module are internally terminated, the end of  
the segment that will be connected to the module will not be a tee  
connector or terminator.  
2.2.2 Th in -n et Segm en ts (THN-MIM7593 on ly)  
The following network design guideline must be followed when  
connecting 75 or 93 ohm coaxial cable segments to the THN-MIM7593.  
If not, unsatisfactory network performance may result.  
The length of the 75 or 93 ohm coaxial cable segment is dependent  
on signal loss from one end of the cable segment to the other. Signal  
loss must not exceed 4 db when measured with a 5 MHz sine wave  
or 6.5 db when measured with a 10 MHz sine wave.  
A 75 or 93 ohm coaxial cable segment will only support point to  
point communication, from one Ethernet device to the  
THN-MIM7593. No other Ethernet devices are allowed on the  
segment.  
The far end of the 75 or 93 ohm coaxial cable segment must be  
terminated with a 50 ohm terminator. This will ensure that the  
Ethernet device on the segment will receive the proper collision  
detection signal in the event of a collision.  
The Ethernet device should be connected as close as possible to the  
terminator on the far end of the 75 or 93 ohm coaxial cable  
segment. This will ensure that impedance mismatches due to  
reflection can be predicted.  
The BNC ports of the THN-MIM7593 are connected to earth  
ground. This eliminates the need for grounding the segment  
connected to the module.  
Impedance mismatches may occur, resulting in signal degradation,  
due to the 75 or 93 ohm coaxial cable segment being connected to a  
50 ohm terminator. This may result in:  
a. Increased jitter on the segment, ranging from +/-3 to +/-6 ns,  
depending on the mismatch  
b. Under certain conditions false collisions may be created.  
Page 2-2  
 
INSTALLATION  
The THN-MIM7593 does not report false collisions to the IRM.  
However, if a non-Cabletron Systems Ethernet device is connected  
to the segment, it is possible for false collisions to be generated.  
Non-Cabletron System devices should be thoroughly tested before  
using them with the THN-MIM7593.  
2.2.3 Th ick -n et Segm en ts  
50 ohm Ethernet type coaxial cable must be used when making up  
thick-net cable segments.  
Each thick-net cable segment connected to a THN-MIM module  
must be no longer than 500 meters (1640 feet) in length.  
When making up networks requiring shorter cable runs, Ethernet  
standard length 23.4, 70.2, and 117 meter cable sections should be  
used. These cable sections may be connected together by a barrel  
connector to form a cable segment.  
Use of non-standard cable lengths may result in impedance  
mismatches causing reflections to occur. These reflections may  
cause data errors.  
A 50 ohm terminator must be connected to the far end of the thick  
segment.  
A BNC to N-Series adaptor must be connected to the applicable  
BNC port to attach the thick-net segment to the module.  
A maximum of 100 transceivers may be attached to a thick-net  
cable segment, and these transceivers must be at least 2.5 meters  
apart throughout the length of the cable. Transceivers should be  
placed on the black bands that run along the cable that are marked  
at 2.5 meter intervals.  
For safety, only one end of a thick-net segment should be connected  
to earth ground. Connection to earth ground at more than one point  
on the segment may allow for the occurrence of dangerous ground  
currents. The BNC ports of the THN-MIM are connected to earth  
ground. This eliminates the need for grounding a thick-net  
segment connected to the module.  
Page 2-3  
 
INSTALLATION  
2.3 INSTALLATION  
Install the THN-MIM into the MMAC as follows:  
CAUTION: Observe all electrostatic precautions when handling the  
THN-MIM. Static discharges will damage the module.  
1. Remove the unit from the shipping box.  
2. Slide the two foam end caps off the unit.  
3. Remove the unit from the protective plastic bag and set the  
THN-MIM in a static free area. Save the shipping box and  
materials in case the module has to be reshipped.  
4. Slide the module into the MMAC card cage.  
5. Secure the module to the MMAC by turning the knurled knobs.  
CAUTION: Be sure the THN-MIM is firmly attached to the MMAC by  
turning the knurled knobs. Failure to do so may result in improper  
operation.  
Install the thick or thin-net cable segment(s) to the BNC ports(s)  
on the module. If a thick-net cable segment is attached to a port on  
the module, a BNC to N-Series adaptor must be attached to the  
port.  
The THN-MIM is now ready for operation. It is recommended that the  
segments be tested prior to transmitting data. Refer to Section 3.2 -  
INSTALLATION CHECKOUT.  
Page 2-4  
 
TESTING AND LANVIEW  
CHAP TER 3  
TESTING AND LANVIEW  
3.1 INTRODUCTION  
This section lists procedures to ensure that the segments connected to  
the Cabletron Systems THN-MIM are operating properly. A  
description of LANVIEW LEDs and their function in troubleshooting  
physical layer network problems are also provided.  
3.2 INSTALLATION CHECK-OUT  
This section contains procedures to test that the physical layer of the  
network and a coaxial segment connected to the THN-MIM are  
operating properly. This section also contains procedures to check that  
the physical layer of the network is operating properly. An Ethernet  
node tester that will generate valid data packets, such as Cabletron  
Systems LAN-MD, is required for this procedure.  
NOTE: This procedure should be performed only after testing each  
segment to verify that the cable lengths, impedance and terminations  
are within IEEE 802.3 specification limits.  
For the purposes of this procedure, it is assumed that two Cabletron  
Systems LAN-MDs are being used. For details on the LAN-MD, refer  
to the LAN-MD User's Manual.  
1. Using a transceiver and an AUI cable, connect a LAN-MD to the  
segment connected to the applicable BNC port.  
2. Select and run test 6 - SERVER.  
This LAN-MD now acts as a SERVER unit and will act as a packet  
echoer when used with another LAN-MD.  
3. Using a transceiver and an AUI cable, connect another LAN-MD to  
any other tested segment connected to the MMAC.  
4. Select and run test 4 - NODE on the LAN-MD connected in step 3.  
Page 3-1  
 
TESTING AND LANVIEW  
At least 100 packets should be sent and received with no errors.  
The packets will be received from and sent back to the LAN-MD  
acting as the SERVER.  
When the applicable segment(s) connected to the THN-MIM have  
successfully completed these tests, the segments are ready for normal  
operation. If any failures were noted, please contact Cabletron Systems  
Technical Support.  
3.3 USING LANVIEW  
The THN-MIM uses Cabletron Systems built-in visual diagnostic and  
status monitoring system, LANVIEW. A network troubleshooter can  
quickly scan the LANVIEW LEDs to observe network status, diagnose  
network problems and identify which node or segment is faulty.  
The following discusses the function and the purpose of each  
LANVIEW LED on the THN-MIM.  
NOTE: There is one Port OK (P OK) and Receive (RCV) LED for each  
port on the module.  
P or t OK (P OK) LED  
When lit, this LED indicates that the port is connected to the network.  
If the LED is not lit, one of the following conditions exist:  
a. The occurrence of 33 consecutive collisions on the attached  
segment or the collision detector was on for more than 2.4 ms.,  
causing the port to be electrically disconnected from the MMAC  
b. The port was turned off by Local Management  
c. The port has yet to receive a valid data packet after  
segmentation or upon power up.  
Receive (RCV) LED  
This LED normally flashes on and off to indicate that the MMAC is  
repeating the data packet. The rate at which the LED flashes will  
increase as network activity increases.  
Page 3-2  
 

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