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CALCULATING RING LENGTH

Page C-15

Solution

Determine the Type 1 cable budget available for lobe cabling.

Drive Limit (Type 1, 16 Mbit/sec)

569 feet

Type 1 cable length already expended

–243 feet

Type 1 budget for the longest lobe

326 feet

Find the Type 1 equivalent for the TCU
to patch panel and wall jack to station
Type 6 patch cables.

Type 1 budget for the longest lobe

326 feet

Type 6 patch cable length (x 2)

16 feet

Conversion factor (Type 6 to Type 1) x 1.5

=>> – 24 feet

Type 1 budget for in-wall lobe cable

302 feet

Conclusion

The required lobe length (285') is less than the cable budget (326')
and the required actual Type 1 cable for the lobe (285' – 16' =
269') is within the Type 1 budget for in-wall cabling (302'). The
installation is feasible.

Содержание TRMIM-10R

Страница 1: ...TRMIM 10R TOKEN RING MEDIA INTERFACE MODULE INSTALLATION GUIDE CABLETRON SYSTEMS P O Box 5005 Rochester NH 03867 5005 The Complete Networking Solution ...

Страница 2: ...NSEQUENTIAL DAMAGES WHATSOEVER INCLUDING BUT NOT LIMITED TO LOST PROFITS ARISING OUT OF OR RELATED TO THIS MAN UAL OR THE INFORMATION CONTAINED IN IT EVEN IF CABLETRON SYSTEMS HAS BEEN ADVISED OF KNOWN OR SHOULD HAVE KNOWN THE POSSIBILITY OF SUCH DAM AGES Copyright November 1990 by Cabletron Systems Inc P O Box 5005 Rochester NH 03867 5005 All Rights Reserved Printed in the United States of Americ...

Страница 3: ...nce in which case the user at his own expense will be required to take whatever steps may be necessary 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 ...

Страница 4: ...ation 2 3 2 1 4 Impedance 2 4 2 1 5 Crosstalk 2 4 2 1 6 Maximum Number of Stations 2 4 2 1 7 Noise 2 5 2 1 8 Temperature 2 5 2 2 Operating Specifications 2 5 2 2 1 Ring Speed 2 5 2 2 2 Connector Types 2 5 2 2 3 Ring Sequence 2 7 2 2 4 LANVIEW LEDs 2 7 CHAPTER 3 INSTALLING THE TRMIM 10R 3 1 Unpacking the TRMIM 10R 3 1 3 2 Installing the TRMIM 10R into the MMAC 3 1 3 3 Attaching Cables to the TRMIM ...

Страница 5: ... APPENDIX B APPLICATIONS B 1 Adding to an Existing Token Ring Network B 1 B 2 Separate Token Ring Networks in One MMAC B 2 B 3 Token Ring Networks Bridged Together B 3 B 4 MMAC with Ethernet and Token Ring Simultaneously B 3 APPENDIX C CALCULATING RING LENGTH C 1 Rules for Calculating Cable Lengths C 1 C 2 Single Wiring Closet Networks C 2 C 3 Multiple Wiring Closet Networks C 9 C 4 Calculating Mi...

Страница 6: ...this manual completely to familiarize yourself with its content and to gain an understanding of the features of the TRMIM 10R A general working knowledge of token ring IEEE 802 5 networks will be helpful when installing the TRMIM 10R 1 1 USING THIS MANUAL Chapter 1 Introduction covers using this document briefly describes features of the TRMIM 10R and token ring and concludes with a list of relate...

Страница 7: ...B 9 connectors on the front panel of the TRMIM 10R provide one Ring In port one Ring Out port for connecting the TRMIM 10R into a token ring network and ten trunk coupling ports for attaching ten stations The TRMIM 10R supports lobe lengths up to 200 meters at 4 Mbit sec and 100 meters at 16 Mbit sec using IBM Type 1 or Type 2 shielded twisted pair cable The supported types and lengths of cables a...

Страница 8: ...TRMIM 10R ports These LEDs are a useful tool for quickly diagnosing physical layer problems A variety of network manangment tools can be used to control and monitor the TRMIM 10R including Cabletron Systems Local Management Cabletron Systems Remote LANVIEW Windows and Cabletron Systems Spectrum Figure 1 1 TRMIM 10R Token Ring Concentrator TOKEN RING TRMIM 10R 1 2 3 4 5 6 7 8 9 10 RI RO ...

Страница 9: ...n Ring Repeater Media Interface Module Installation Guide 1 4 RECOMMENDED READING The following publications are recommended if more information is required on implementing a Token Ring network Local Area Networks Token Ring Access Method IEEE Standard 802 5 LAN Troubleshooting Handbook Mark Miller 1989 M T Publishing Inc 1 5 GETTING HELP If you need additional support related to the Cabletron Sys...

Страница 10: ...UIREMENTS The following subsections summarize the network requirements to operate this equipment 2 1 1 Cable Types The TRMIM 10R supports IBM shielded twisted pair cable Types 1 2 6 and 9 for Lobe and Trunk cabling Table 2 1 lists all of the IBM cable types for reference but the TRMIM 10R supports Types 1 2 6 and 9 only Table 2 1 IBM Cable Types Type 1 Two shielded twisted pairs STP of 22 AWG soli...

Страница 11: ...RMIM 10R must consider the Adjusted Ring Length ARL ARL results from automatic recovery processes that attempt to restore continuity to a broken ring The ARL is the longest potential ring length the ring that would exist following recovery from a failure of the shortest ring segment trunk cable Refer to the discussion of token ring concepts related to ARL in Appendix A Appendix C describes how to ...

Страница 12: ...trunk cabling must be determined by performing the calculations described in Appendix C In a totally passive ring no repeaters or active concentrators etc on the ring the entire trunk length must be included in calculation of cable lengths When only a portion of the ring is passive the combined length of the trunk cabling between the active components must be considered in the cable length calcula...

Страница 13: ... IBM Types 6 9 150 ohms 1 MHz to 20 MHz 10 2 1 5 Crosstalk Crosstalk is caused by signal coupling between the different cable pairs contained within a multi pair cable bundle In shielded twisted pair cables the effects of crosstalk are minimized 2 1 6 Maximum Number of Stations Table 2 5 shows the maximum number of stations that can be inserted into a single ring using STP cabling according to rin...

Страница 14: ...facturer s specifications 2 2 OPERATING SPECIFICATIONS This section includes the operating specifications for the TRMIM 10R Cabletron Systems Inc reserves the right to change these specifications at any time without notice 2 2 1 Ring Speed The TRMIM 10R can be operated at a ring speed of either 4 Mbit sec or 16 Mbit sec The default ring speed is set by a hardware jumper on the TRMIM 10R The ring s...

Страница 15: ... TCU Ports Pin Pin Pin 1 TX 4 Ground 7 Ground 2 Ground 5 RX 8 Ground 3 Not Used 6 TX 9 RX Figure 2 1 TCU Ports Pinouts Trunk Connections Two Female DB 9 connectors for attaching STP trunk cables are located on the lower left side of the TRMIM 10R front panel Figure 2 2 show the signal and pin assignments for the STP ring interface Trunk Ports Pin Pin Ring In 1 RX Main Ring 5 TX Backup Ring 2 Groun...

Страница 16: ... FNB to Slot 3 ports 1 5 7 11 12 via the FNB to Slot 1 ports 2 5 8 12 then returning to the TRMIM 10R in Slot 2 threading through ports 1 2 3 5 and 6 then out the Ring Out port 2 2 4 LANVIEW LEDs There are a number LANVIEW LEDs on the front panel of the TRMIM 10R The exact locations for these LEDs are illustrated in Figure 2 3 Table 2 6 describes the functions for each LED Table 2 6 LANVIEW LEDs L...

Страница 17: ...PORT STATUS Green LED Figure 2 3 TRMIM 10R LANVIEW LEDs SAFETY WARNING It is the responsibility of the person who sells the system to which the TRMIM 10R will be a part to ensure that the total system meets allowed limits of conducted and radiated emissions This equipment is designed in accordance with UL478 UL910 NEC 725 2 b CSA IEC TUV VDE Class A and meets FCC part 15 Class A limits ...

Страница 18: ...MENTS SPECIFICATIONS Page 2 9 SERVICE MTBF MHBK 217E 119 951 hrs MTTR 0 5 hr PHYSICAL Dimensions 13 4D x 11 5H x 2 0W inches 34 0D x 29 2H x 5 1W centimeters includes front panel Weight 2 lbs 2 oz 963 9 grams ...

Страница 19: ...d shipped CAUTION Electro Static Discharges ESD will damage the TRMIM 10R Observe all precautions to prevent electrostatic discharges and when handling the TRMIM 10R hold only the edges of the board or the metal front panel Avoid touching the components or surface of the TRMIM 10R 2 Remove the TRMIM 10R from its protective plastic bag and set it on top of its protective bag in a static free area 3...

Страница 20: ... Position the hardware jumper on the proper pins on the TRMIM 10R to select either 4 or 16 Mbit sec as the default ring speed see Figure 3 1 The speed setting affects the number of stations and the maximum lobe length Refer to Chapter 2 Installation Requirements Specifications for additional information NOTE The network speed is also selectable by software The software selection overrides the hard...

Страница 21: ...er Figure 3 2 Installing the TRMIM 10R IRM MMAC 8 TRMIM 10R KNURLED KNOBS BOARD SLOT TOKEN RING TRMIM 10R Network Speed Jumper Twelve DB 9 Connectors Six on mother board and six on daughter board Daughter board Mother board Front Panel 4 Mbit sec 16 Mbit sec J1 J1 ...

Страница 22: ...ected according to the information provided in Chapter 2 Installation Requirements Specifications 3 3 1 Connecting Lobe Cabling The physical lobe cable see Figure 3 3 between the TRMIM 10R and a token ring station consists of two pairs of wire a transmit signal pair TX TX and a receive signal pair RX RX The transmit pair from the TRMIM 10R connects to the receive pair of the station and the receiv...

Страница 23: ...ate patch cable DB 9 at both ends or DB 9 to Medium Interface Connector MIC illustrated in Figure 3 4 If an adapter is used attach the adapter to the cable before connecting the twisted pair cable to the station Connect the wall plate end of the cable to the wall plate Connect the other end of the cable to the port on the token ring station 3 3 2 Connecting Trunk Cables The TRMIM 10R Ring In Ring ...

Страница 24: ...EDs on the stations are indicating normal operation TRMIM 10R red Error LED off and no error indications at the stations If you encounter errors or abnormal operation proceed to Chapter 4 Testing and Troubleshooting The green Link Attached LEDs on the MIM should be illuminated for each station that is inserted into the ring The yellow 16Mb LED should only be on if 16 Mbit sec ring speed is desired...

Страница 25: ...h the network to be sure that there are no breaks in the ring and that it is free from logical design errors While tracing the ring a Check each cable connection on the MIM b Verify that the pinout for every connector is correct c Check the cable conductors for continuity Cable testers are available for this task d Check each cable connection at patch panels and wall plates 3 Check the network rin...

Страница 26: ... Out port is in a non wrap state OFF Respective Ring In Ring Out port is in a wrap state When these checks have been successfully completed for each connec tion to the TRMIM 10R the MIM is ready for normal operation If further problems occur contact Cabletron Systems Technical Sup port 4 2 USING LANVIEW LANVIEW is Cabletron Systems built in visual diagnostic and status monitoring system Using LANV...

Страница 27: ... lit indicating that the respective ring port is in a non wrap state When either indicator is not lit it indicates that the respective ring port has been set to the wrap state by network management software The TRMIM 10R does not automatically wrap to recover from ring segment failure ERR The error indicator Red should not be lit under normal operating conditions When lit this LED indicates the de...

Страница 28: ...e up of a number of stations electrically connected to form a continuous loop Physically the stations are usually arranged in a star pattern around a hub or concentrator module The hub or concentrator provides ring access for several stations that are electrically or optically in the case of fiber optic media attached to the ring The connections at the hub form wiring drops called lobes that exten...

Страница 29: ...nd uses the opportunity to transmit information it appears that the token is removed from the ring and held by the station for the duration of the transmission In reality the token is modified by the station and used to create the data frame The token is divided and the information is inserted between the modified Access Control AC field and the Ending Delimiter ED Figure A 2 shows the token and i...

Страница 30: ...now available for use by another station The token resumes its circulation until it reaches the next station that is waiting to send data Here the process will begin again with that station seizing the token Unless an error occurs that disrupts normal token passing the original token remains in circulation Lost tokens are detected by the AM and appropriate corrective procedures are initiated Figur...

Страница 31: ... to these components The network functions provided by the following devices are often combined in a single device A concentrator is a device that provides multiple trunk coupling unit ports bounded by externally accessible Ring In and Ring Out trunk ports The primary function of a concentrator is to serve as a hub providing trunk coupling units for attaching stations and controlling access to the...

Страница 32: ...tions Bridge devices not illustrated connect rings that cannot be expanded at their maximum number of stations or rings that are operating at different speeds 4 Mbit sec vs 16 Mbit sec They do not expand a single network rather they connect multiple networks together They maintain routing information filter messages that cross the bridge regenerate signals and provide buffering required for networ...

Страница 33: ...g and a backup ring This backup ring is used to restore the continuity of the ring in the event of a failed trunk segment broken trunk cable Figure A 4 illustrates how the open ends of the ring can be wrapped into the backup ring restoring continuity through the creation of a new ring Some devices will wrap automatically when a problem is detected Others require human intervention to restore the r...

Страница 34: ...ance include the lobe from the sending station to the concentrator the sum of the trunk cable segments around the ring and since the sending station must ultimately remove the original message from the ring the lobe from the concentrator to the sending station Figure A 5 illustrates the cables that make up the drive distance in a token ring Figure A 5 Cable Lengths in a Token Ring When a wrap occu...

Страница 35: ...culating cable lengths giving consideration to ARL Figure A 6 shows the impact of a broken trunk segment on overall ring length Without the break the ring length is 275 meters and the drive distance for the station at the longest lobe is 575 meters 275 2 x 150 With the 50 meter section of trunk cable between Concentrator 2 Ring Out and Concentrator 3 Ring In broken the two ring ports must be wrapp...

Страница 36: ...ws the addition of an MMAC with a TRMIM 12 and a TRRMIM 16 into an existing token ring network Here the TRRMIM 16 is used to insert an MMAC and its token ring products into the ring Any concentrator with externally accessible trunk ports designed for use in an MMAC can be used The Ring In and Ring Out ports of the TRRMIM 16 are connected to Ring In and Ring Out ports of the adjacent concentrators ...

Страница 37: ...ifferent ring speeds e g one at 4 Mbit sec and one at 16 Mbit sec cannot be linked together Example MMAC 8FNB one TRMIM 10R one TRMIM 22P five TRMIM 12s and one IRM Slot 0 IRM Slot 1 TRMIM 10R for ring network 1 at 4 Mbit sec Slot 2 TRMIM 22P for ring network 1 at 4 Mbit sec Slot 3 first TRMIM 12 for ring network 2 at 4 Mbit sec Slot 4 second TRMIM 12 for ring network 2 at 4 Mbit sec Slot 5 first ...

Страница 38: ...ns is close to its maximum capacity of 136 stations When the two networks are connected the bridge is counted as a station in both rings Figure B 3 Using a Bridge to Connect Ring Networks B 4 MMAC WITH ETHERNET AND TOKEN RING SIMULTANEOUSLY Figure B 4 illustrates the simultaneous installation of an Ethernet network with a token ring network in the same MMAC To connect the two networks together req...

Страница 39: ...her Figure B 4 Token Ring and Ethernet in the Same MMAC MMAC 8FNB with IRM THN MIM and TRMIM 12 AUI Cable T T T Ethernet Network Since the Ethernet and Token Ring Networks are NOT Bridged together by a bridging device they can NOT share data Token Ring Network ...

Страница 40: ...nformation They show how the tables on the Cable Length Worksheets were compiled and are NOT needed for calculating your cable lengths C 1 RULES FOR CALCULATING CABLE LENGTHS Chapter 2 Requirements Specifications lists information related to the maximum lobe length maximum drive distance and specifications for various cable types that can be used with your Cabletron Systems token ring products Ref...

Страница 41: ...o calculate your longest lobe cable length Choose the column that matches your ring speed and complete the worksheet as follows 1 The Maximum Drive Limit when considering ARL is one half the maximum drive distance 2525 feet at 4 Mbit sec or 1138 feet at 16 Mbit sec or 1263 feet at 4 Mbit sec or 569 feet at 16 Mbit sec for STP cable 2 Refer to the table at the bottom of the worksheet to find the In...

Страница 42: ...r add active components repeaters to extend the available trunk cable length Use Figure C 1 and the STP Cable Length Worksheet for Single Wiring Closets at the end of this section to follow the calculations in this example of a 4 Mbit sec ring Single Wiring Closet 4 Mbit sec 1 Maximum Drive Limit 1 1263 ft 2 Internal Trunk Length 7 concentrators in 2 racks 150 2 150 ft 3 Maximum Type 1 Lobe Length...

Страница 43: ... wiring closet The difference between the two formulas accounts for cabling between racks within a wiring closet The term Internal Trunk Length refers to trunk cabling length within the wiring closet adjusted to give consideration to ARL The actual calculations used in the table are as follows 30 of Type 6 WALL PLATE WALL PLATE STATION 1 STATION 2 WIRING CLOSET 140 of TYPE 1 LOBE CABLING TRUNK CAB...

Страница 44: ...tor is configured Multiple Rack Internal Trunk Length Rack to Rack Patch Cables Concentrator to Concentrator Patch Cables where Rack to Rack Patch Cables 45 x number of Racks Concentrator to Concentrator Patch Cables 12 x number of Concentrators number of Racks NOTE You are hereby authorized to copy the next page STP Cable Length Worksheet in this appendix Copy the worksheet for your planning need...

Страница 45: ...2 405 10 120 186 219 252 285 318 351 384 417 450 11 132 198 231 264 297 330 363 396 429 462 12 144 210 243 276 309 342 375 408 441 474 13 222 255 288 321 354 387 420 453 486 14 234 267 300 333 366 399 432 465 498 15 246 279 312 345 378 411 444 477 510 16 258 291 324 357 390 423 456 489 522 17 270 303 336 369 402 435 468 501 534 18 282 315 348 381 414 447 480 513 546 19 294 327 360 393 426 459 492 ...

Страница 46: ...2 405 10 120 186 219 252 285 318 351 384 417 450 11 132 198 231 264 297 330 363 396 429 462 12 144 210 243 276 309 342 375 408 441 474 13 222 255 288 321 354 387 420 453 486 14 234 267 300 333 366 399 432 465 498 15 246 279 312 345 378 411 444 477 510 16 258 291 324 357 390 423 456 489 522 17 270 303 336 369 402 435 468 501 534 18 282 315 348 381 414 447 480 513 546 19 294 327 360 393 426 459 492 ...

Страница 47: ...to the table at the bottom of the worksheet to find the Internal Trunk Length for each Wiring Closet WC in the multiple closet configuration Add these values to find the total Combined Trunk Length WC 1 WC 2 WC n Combined Trunk Length 3 Add the Actual Longest Lobe step 1 to the Combined Trunk Length step 2 to find the Internal Drive Distance and enter the sum here and on line 4a Internal Drive Dis...

Страница 48: ...d the STP Cable Length Worksheet for Multiple Wiring Closets to follow the calculation in this example of a 4 Mbit sec ring Multiple Wiring Closets 4 Mbit sec 1 Actual Longest Lobe given as 55 feet 1 55 ft 2 Combined Trunk Length 117 165 213 495 2 495 ft 3 Internal Drive Distance 3 550 ft 4 Maximum Drive Limit 4 1263 ft 4a Internal Drive Distance 550 ft 5 External Trunk Cable Budget 5 713 ft 6 Act...

Страница 49: ...ation The term Internal Trunk Length refers to trunk cabling length within the wiring closet adjusted to give consideration to ARL The actual calculation used in the table is described as follows Internal Trunk Length 2 x TCU Patch Cables Rack to Rack Patch Cables Concentrator to Concentrator Patch Cables 70 95 175 55 LONGEST LOBE Token Ring Corporation WC 3 2 Racks 14 Concentrators 213 feet WC 2 ...

Страница 50: ...u are hereby authorized to copy the next page STP Cable Length Worksheet in this appendix Copy the worksheet for your planning needs but remember to keep a blank copy for future network configuration changes MAIN RING WALL PLATE WALL PLATE STATION 1 STATION 2 TYPE 1 or 2 IN OUT WIRING CLOSET LOBE CABLING TRUNK CABLING 8 foot patch cables Type 6 used within racks From Previous Wiring Closet To Next...

Страница 51: ...195 228 261 294 8 108 141 174 207 240 273 306 339 9 120 153 186 219 252 285 318 351 384 10 132 165 198 231 264 297 330 363 396 429 11 144 177 210 243 276 309 342 375 408 441 12 156 189 222 255 288 321 354 387 420 453 13 201 234 267 300 333 366 399 432 465 14 213 246 279 312 345 378 411 444 477 15 225 258 291 324 357 390 423 456 489 16 237 270 303 336 369 402 435 468 501 17 249 282 315 348 381 414 ...

Страница 52: ...195 228 261 294 8 108 141 174 207 240 273 306 339 9 120 153 186 219 252 285 318 351 384 10 132 165 198 231 264 297 330 363 396 429 11 144 177 210 243 276 309 342 375 408 441 12 156 189 222 255 288 321 354 387 420 453 13 201 234 267 300 333 366 399 432 465 14 213 246 279 312 345 378 411 444 477 15 225 258 291 324 357 390 423 456 489 16 237 270 303 336 369 402 435 468 501 17 249 282 315 348 381 414 ...

Страница 53: ... twelve concentrators in three racks currently serves 120 stations This exercise connects an additional station to an open TCU port on existing TRMIM 10R The new station will require the longest lobe cable yet installed 285 feet From the table at the bottom of the Single Wiring Closet Cable Length Worksheet we find the adjusted internal cable length for the wiring closet is 243 feet Assuming that ...

Страница 54: ... for the TCU to patch panel and wall jack to station Type 6 patch cables Type 1 budget for the longest lobe 326 feet Type 6 patch cable length x 2 16 feet Conversion factor Type 6 to Type 1 x 1 5 24 feet Type 1 budget for in wall lobe cable 302 feet Conclusion The required lobe length 285 is less than the cable budget 326 and the required actual Type 1 cable for the lobe 285 16 269 is within the T...

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