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5–4

Troubleshooting

Table 5–1 (Cont.)

Troubleshooting a DECrepeater 90C Standalone Unit

If...

Then...

Do this...

If the same condition
exists when a good
cable is plugged in,
the DECrepeater
90C is defective.

Replace the DECrepeater 90C.

Continue installing
other network cables
for each port you are
going to use.

The indicator LED for each
properly terminated port
should turn on.

If the LED for each
properly terminated
port remains off
when a cable is
connected, the
DECrepeater 90C
is defective.

Replace the DECrepeater 90C.

Содержание DECrepeater 90C

Страница 1: ...DECrepeater 90C Owner s Manual Order Number EK DECMR OM 002 Digital Equipment Corporation...

Страница 2: ...RS 252 227 7013 Copyright Digital Equipment Corporation 1991 All Rights Reserved Printed in U S A FCC NOTICE The equipment described in this manual generates uses and may emit radio frequency energy T...

Страница 3: ...1 Configuration Guidelines 2 1 Port Partitioning 2 2 3 Installation Standalone Installation 3 1 Select a location 3 1 Place the repeater on a table 3 1 Mount the repeater on a wall 3 2 Connect the ca...

Страница 4: ...ent With the DECbridge 90 4 11 Management Disconnect 4 11 Management Session 4 13 If Problems Are Reported 4 14 Messages 4 16 Standalone Configuration Management 4 18 5 Troubleshooting DECrepeater 90C...

Страница 5: ...2 4 1 Sample Configuration and Topology Map 4 12 4 2 Typical Network Topology Map 4 13 4 3 Typical Standalone Topology Map 4 18 Tables 1 1 DECrepeater 90C LEDs 1 4 2 1 DECrepeater 90C Partitioning 2...

Страница 6: ...hapter 2 describes the configuration rules and operating conditions for the ThinWire multiport repeater in a ThinWire Ethernet system or standard Ethernet network Chapter 3 provides instructions for i...

Страница 7: ...iables In command descriptions italic type indicates a variable that you supply SHOW ADDRESS In text commands are shown in all upper case letters to differentiate them from regular text For the VMS op...

Страница 8: ...eater 90C is also compatible with the 802 3 standard for the 10Base2 networks The repeater can operate in a standalone configuration or as a managed repeater installed in Digital s DEChub 90 Ethernet...

Страница 9: ...re Segment Ethernet Backbone DECbridge 90 Work Group Bridge PC Workstation DECserver DECrepeater 90C Workstation DECrepeater 90T DECserver 90L Computer 2 Computer 1 Server LJ 00955 TI0 Figure 1 1 Samp...

Страница 10: ...e repeater is plugged in all LED indicators turn on Only the network activity LED turns off 2 Connect the repeater to a properly terminated ThinWire Ethernet 3 Connect any personal computers workstati...

Страница 11: ...activity of each port The top LED represents port 1 and the bottom LED represents port 6 On The port has a connection Off The port does not have a connection or has been partitioned Flashing The port...

Страница 12: ...Overview 1 5 6 4 5 LJ 00544 TI0 7 8 9 7 8 9 3 2 1...

Страница 13: ...eater 90C terminates ports 1 through 6 internally you must terminate the other end of the segment with a 50 ohm terminator Port 0 is not terminated internally Use a T connector when connecting port 0...

Страница 14: ...tted to all ports The port status LEDs on the repeater indicate the status of each port including partitioning activity On The port is either active or not partitioned Off The port is autopartitioned...

Страница 15: ...e repeater in a DEChub 90 Ethernet backplane see the Backplane Installation section Standalone Installation To install the DECrepeater as a standalone unit on a table or wall perform the following pro...

Страница 16: ...from the top of the repeater L J 0 0 3 2 0 T I 0 2 Use the mounting holes on the cover to determine a position for the mounting screws on the wall 3 Secure the back cover to the wall using the mountin...

Страница 17: ...Installation 3 3 LJ 00701 TI0 5 Attach the back cover to the repeater 6 Mount the repeater onto the mounting screws...

Страница 18: ...t 3 All the LED indicators should turn on during initial power up After approximately 0 5 seconds the network activity LED should turn off while the other LEDs remain on 4 Connect the Ethernet ThinWir...

Страница 19: ...Verify the operation of each device by sending information to the port being tested The DECrepeater 90C is now installed PC or Workstation 50 Ohm Terminator T Connector L J 0 0 9 3 9 T I 0 T Connector...

Страница 20: ...ne perform the following procedures Remove the back cover Remove the back cover if one is present 1 Insert a small screwdriver into the top mounting hole on the cover 2 Lift the internal latch with th...

Страница 21: ...the backplane as shown in the following figure Place the lower mounting tab on the back of the DECrepeater 90C in the correct mounting slot on the backplane 2 Rock the repeater into place You hear an...

Страница 22: ...0 status LED and port status LEDs turn on with intensity proportional to the amount of activity on the indicated port NOTE The port status LEDs for unconnected ports should turn off when network traf...

Страница 23: ...at affect the DECrepeater 90C are part of the DECbridge 90 command set Functions Online management allows you to perform the following functions on the DECrepeater 90C Identify all repeaters in the DE...

Страница 24: ...u must know The Ethernet address of the bridge to be managed The Ethernet name of the circuit that contains the bridge The circuit name is needed because a VMS operating system may have more than one...

Страница 25: ...bridge DBRG1 on address 13 87 and access it from a VAX 6400 Ethernet circuit name BNA 0 you could use the following commands NCP NCP DEFINE NODE DBRG1 ADDRESS 13 87 HARDWARE 08 00 2b 01 23 45 SERVICE...

Страница 26: ...sva 0 VAX 11 780 and VAX 11 785 computers UNIBUS una 0 Console Carrier User Interface The DECbridge 90 is not shipped with a preset password so no password prompt displays when you connect for the fir...

Страница 27: ...AGEMENT ENABLE DISABLE BRIDGE PASSWORD password string LIST BRIDGE SET3 BRIDGE HUB_MANAGEMENT ENABLE DISABLE PORT hub number slot number port number ENABLE DISABLE REPEATER hub number slot number RESE...

Страница 28: ...The work group port is 2 A repeater port is identified by a hub number as just described and the port number within the slot 0 to 8 For example 2 4 refers to the fourth port on a repeater in slot 2 in...

Страница 29: ...sers The DECbridge 90 should not be used in applications that absolutely depend on the prevention of any unauthorized modifications to the parameters LIST BRIDGE Displays the nonvolatile bridge wide p...

Страница 30: ...bridge 90 is used with the DECrepeater 90C or 90T this commands also displays the hub slot number and repeater port that each station is attached to It may take several minutes for the SHOW ADDRESS co...

Страница 31: ...efined in the command so the default 1 was used DECbridge SHOW PORT 3 2 Hub 1 slot 3 port 2 segment counter 0 status disabled no carrier loopback Example A SHOW PORT command for hub 2 is shown DECbrid...

Страница 32: ...status no carrier loopback Hub 1 slot 3 port 7 segment counter 1 status no carrier loopback Hub 1 slot 3 port 8 segment counter 1 status no carrier loopback Example The response to a SHOW REPEATER co...

Страница 33: ...nect two DEChub 90 backplanes together and manage the repeaters in both DEChub 90s with one DECbridge 90 The DECbridge 90 communicates with the DECrepeater 90C by using private signals on the DEChub b...

Страница 34: ...repeater 90T 08 00 2B 0F 19 23 08 00 2B 1D 07 21 08 00 2B 10 6A 31 08 00 2B 16 23 4C 08 00 2B 10 20 30 08 00 2B A6 43 17 Disk Server Thinwire Cable L J 0 0 9 4 7 T I 0 PC PC AUI Cable Figure 4 1 Sampl...

Страница 35: ...onsole carrier session with the bridge from any remote node After you connect to the bridge the following prompt displays DECbridge When a bridge goes through a power cycle or is reset the bridge begi...

Страница 36: ...rev 1 6 ports Hub 1 slot 5 port 0 segment counter 0 status operational Hub 1 slot 5 port 1 segment counter 0 status excessive collisions Hub 1 slot 5 port 2 segment counter 0 status excessive length c...

Страница 37: ...nd off or when cables are connected or disconnected from the repeater during installation and reconfiguration If none of these normal causes have occurred you should suspect an intermittent problem wi...

Страница 38: ...he DECbridge 90 was not the designated hub manager when the SHOW PORT or SHOW REPEATER command was issued This occurs when The bridge is reset and the DECbridge is not the hub manager for 60 seconds A...

Страница 39: ...repeater type in hub h slot s is not known to the DECbridge 90 but the repeater ports can still be managed with the DECbridge 90 No repeater responds There is no repeater installed in the requested hu...

Страница 40: ...d every 5 seconds until the test passes Standalone Configuration Management The recommended process for managing a small stand alone network is Maintain records indicating which stations are connected...

Страница 41: ...0 Vdc voltage is normal Off The voltage is abnormal as in a power failure Network activity indicator Monitors the network activity On There is network activity Off There is no network activity Port 0...

Страница 42: ...the DEChub 90 backplane Before You Start 1 Verify the installation of the repeater The installation must meet the configuration rules in Chapter 2 2 Note the fault condition 3 Isolate the problem Use...

Страница 43: ...and power supply for 220 V operation The network activity LED is off There is low network activity or no network activity Ensure that network activity is present If the network activity LED still fail...

Страница 44: ...s passed Connect a known active ThinWire network segment to the repeater The status LED for the connected port stays on while all status LEDs for the unconnected ports should turn off as soon as the f...

Страница 45: ...ged in the DECrepeater 90C is defective Replace the DECrepeater 90C Continue installing other network cables for each port you are going to use The indicator LED for each properly terminated port shou...

Страница 46: ...Troubleshooting 5 5 6 4 5 LJ 00544 TI0 7 8 9 7 8 9 3 2 1...

Страница 47: ...ub 90 is off there is a problem with the DEChub 90 power supply See the troubleshooting procedures in the DEChub90 Owner s Manual If the power LED on the DEChub 90 power supply is on are the power LED...

Страница 48: ...90C is defective Replace the DECrepeater 90C The port 0 network activity LED is off The DECrepeater or any other unit in the DEChub 90 may not be connected to an active segment Connect a known active...

Страница 49: ...tinuous Check the cable for continuity The cable may be defective Replace with a known good cable If the cable is continuous the cable may not be properly terminated Properly terminate the cable If th...

Страница 50: ...lowing specifications for the DECrepeater 90C Physical dimensions Environmental specifications Electrical specifications Parts list Physical Dimensions Dimension Measurement Height 3 5 cm 1 4 in Width...

Страница 51: ...e 5 C to 50 C 41 F to 122 F Maximum rate of change 20 C hr 36 F hr Relative humidity 10 to 95 noncondensing Wet bulb temperature 32 C 90 F maximum Dew point 2 C 36 F minimum Altitude Sea level to 2 4...

Страница 52: ...international 208 Vac to 256 Vac nominal 240 Vac AC cord length 6 feet Current at 120 volts 25 amps Current at 240 volts 125 amps Frequency 50 Hz to 60 Hz Power consumption 9 watts Output voltage 5 1...

Страница 53: ...Title Order Number DECbridge 90 Owner s Manual EK DEWGB OM DEChub 90 Owner s Manual EK DEHUB OM Open DECconnect Building Wiring Components and Application Catalog EB K2407 42 DECrepeater 90T Owner s M...

Страница 54: ...ager unit in use in the hub During this 60 second period you cannot manage the DECrepeater 90 units remotely This restriction does not apply to the repeaters themselves A repeater inserted into the hu...

Страница 55: ...his information proceeds as follows For every station in the work group Tell the repeaters to wait for a message from this station Wait up to 90 seconds for the station to transmit a message Ask the r...

Страница 56: ...table is dynamic Ethernet addresses are added to the table when a device first transmits on the network Addresses are removed when a devices does not retransmit within a user specified period from 1 t...

Страница 57: ...power 1 4 Connectors network BNC 1 4 port BNC 1 4 Console carrier Console carrier Cont commands 4 5 establishing a session from ULTRIX 4 3 to 4 4 establishing a session from VMS 4 2 to 4 3 user interf...

Страница 58: ...nagement protocol partitioned 4 11 N Network activity indicator 1 4 4 19 Network connector BNC 1 4 Network control program NCP 4 2 Networks CSMA CD 1 1 IEEE 802 3 1 1 O Operating altitude A 2 dew poin...

Страница 59: ...A 2 temperature A 2 Specifications environmental A 2 power supply A 3 Standalone unit installation 3 1 to 3 5 Status indicators 1 4 4 19 T Temperature A 2 maximum rate of change A 2 Troubleshooting 5...

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