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INSTALLATION REQUIREMENTS/ SPECIFICATIONS

2-5

 

POWER SUPPLY REQUIREMENTS                                                            

Parameter

Typical

Worst

Value

Case

 

120V Input Voltage:  120 V

 90 to 130 V

Input Current

NB20E:

0.5 Amps

1.0 Amps

NB25E:

0.75 Amps

1.5 Amps

Frequency Range:

47 - 63 Hz

220V Input Voltage:

220 V

180 to 264 V

Input Current

NB20E:

0.25 Amps

0.5 Amps

NB25E:

0.375 Amps

0.75 Amps

Frequency Range:

47 - 63 Hz

Overload Protection

Input:

(2) 3AG 3 amp fuses in series with both primary 
inputs.

Output:

(2) 3AG 1 amp fuse for each AUI port.

 

ENVIRONMENTAL REQUIREMENTS                                                         

 

Operating Temperature:

+5

 

°

 

 to +40

 

°

 

C

Non-operating Temperature: -30

 

°

 

 to +90

 

°

 

C

Operating Humidity:

 5 to 95% (non-condensing)

Summary of Contents for NB20E

Page 1: ...NB20E and NB25 E TWO PORT ETHERNET BRIDGES USER S MANUAL CABLETRON SYSTEMS P O BOX 6257 ROCHESTER NH 03867 6257 ...

Page 2: ......

Page 3: ...ETRON 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 May 1990 by Cabletron Systems Inc P O Box 6257 E Rochester NH 03867 625...

Page 4: ...residential area is likely to cause interference in which case the user at his own expense will be required 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 measure Re orient the receiving antenna Relocate ...

Page 5: ...TION REQUIREMENTS 2 1 2 2 NETWORK REQUIREMENTS 2 1 2 3 OPERATING SPECIFICATIONS 2 2 CHAPTER 3 INSTALLING THE NB20E OR NB25E BRIDGE 3 1 UNPACKING THE NB20E OR NB25E BRIDGE 3 1 3 2 INSTALLING THE BRIDGE 3 1 3 2 1 Installing the Rack Mount Brackets 3 2 3 2 2 Cable Support Installation 3 3 3 2 3 Connecting The Bridge To The Network 3 3 3 2 4 Setting The Mode Switches 3 4 3 2 5 Connecting The NB20E or ...

Page 6: ...CONTENTS iv ...

Page 7: ...ernet Bridge An explanation of the bridge filtering process and a discussion of bridge functionality in multi bridge environments are also included The chapter concludes with a list of related manuals Chapter 2 Installation Requirements Specifications contains a list of hardware software location and environmental requirements that must be met before you install either bridge Chapter 3 Installing ...

Page 8: ...Table to determine which data packets should be allowed to cross the bridge keeping local traffic local The NB20E Bridge uses a software filter database to check destination addresses against its Source Address Table The NB25E Bridge uses a higher performance hardware filter database Both bridges are equipped with a feature called Aging Time that continually makes space for new entries into the So...

Page 9: ...of Cabletron s many Ethernet transceivers for data transmission over various media including twisted pair fiber optic and or thick or thin Ethernet coaxial cable 1 4 THE BRIDGE FILTERING METHOD The Cabletron Systems NB20E and NB25E prevent unnecessary network traffic from passing through the bridge by implementing a filtering process This process begins with the creation of a list of local node ad...

Page 10: ...dress Table indicating that the node is on LAN 1 If the destination address of a packet is located on a different segment the bridge will forward the packet across the bridge If Node B sends a packet to Node A the bridge will compare the destination address of the packet against the addresses in the Source Address Table It will then detect Node A as being on the other side of the bridge and forwar...

Page 11: ...ished as the root bridge This bridge has priority over all other bridges Each bridge in a Spanning Tree must learn which bridge is the root and then determine its own relative priority within the network Determining the root bridge begins with the broadcast of Bridge Protocol Data Units BPDUs across the network When the bridges go on line each bridge sends out a BPDU which contains its priority fi...

Page 12: ...h to the root that is most economical The bridges in the network send out BPDUs to the other bridges so that they can all learn which is the bridge in the network or in a potential loop configuration with the lowest cost path to the root The bridges can then determine their own priorities and roles as designated or redundant bridges Redundant bridges are blocked from forwarding packets but they co...

Page 13: ...y management tools so that a bridge can operate at its full capacity The network manager s ability to set up parameters within Remote LANVIEW ensures optimal performance for each bridge and hence each network For example a network manager can monitor the flow of traffic through a bridge the status of a database the bridge protocol and port parameters and the bridge setup The number of frames recei...

Page 14: ...LATED MANUALS The manuals listed below should be used to supplement the procedures and other technical data provided in this manual The procedures will be referenced where appropriate but will not be repeated Cabletron Systems Remote LANVIEW Network Control Management for the Cabletron Systems NB20E and NB25E User s Manual Cabletron Systems LAN MD User s Manual ...

Page 15: ...ements The location must have an unrestricted surface area 21 inches 53 34 cm wide and must be at least 18 inches 45 72 cm deep and 6 inches 15 24 cm high A standard 3 prong power receptacle must be located within 7 feet 2 13 m of the site If a shelving unit is to be used the unit must be able to support 30 pounds 13 6 kg of static weight The temperature of the location must be maintained between ...

Page 16: ...25E Packet Buffer Memory RAM 128K 128K Internal Processor 16MHz 16MHz Intel 80186 Intel 80186 Ethernet Controller two 8390 two 8390 Ethernet Ethernet Controllers Controllers Scratch Ram 512K 512K PERFORMANCE Parameter NB20E NB25E Packet Filter Rate max viewed per second 15 000 Packets 28 000 Packets Packet Forward Rate max viewed per second 8 000 Packets 11 000 Packets Forwarding Latency 125 µs Mi...

Page 17: ...increased viewing effect XMT transmit When lit this LED indicates the bridge is transmitting packets to that segment green indictor RCV receive When lit this LED indicates that the bridge is receiving data packets from that segment yellow indicator CP collision present When lit this LED indicates that a collision is occurring on that segment red indicator POK port ok When lit this LED indicates tr...

Page 18: ...nnector Type 15 position D type receptacle Pin 1 Logic Ref Pin 9 Collision 2 Collision 10 Transmit 3 Transmit 11 Logic Ref 4 Logic Ref 12 Receive 5 Receive 13 Power 12 Vdc 6 Power return 14 Logic Ref 7 No Connection 15 No Connection 8 Logic Ref Connector Shell Protective Ground RS232 PORT Type Standard 9 pin RS232 Port Pin 1 DCD Pin 6 NU 2 TX 7 TRS 3 RX 8 CTS 4 DTR 9 RX Clock 5 Signal Ground ...

Page 19: ...equency Range 47 63 Hz 220V Input Voltage 220 V 180 to 264 V Input Current NB20E 0 25 Amps 0 5 Amps NB25E 0 375 Amps 0 75 Amps Frequency Range 47 63 Hz Overload Protection Input 2 3AG 3 amp fuses in series with both primary inputs Output 2 3AG 1 amp fuse for each AUI port ENVIRONMENTAL REQUIREMENTS Operating Temperature 5 to 40 C Non operating Temperature 30 to 90 C Operating Humidity 5 to 95 non ...

Page 20: ...sponsibility of the person who sells the system of which the NB20E or NB25E will be a part to ensure that the total system meets allowed limits of conducted and radiated emissions SERVICE MTBF MHBK 20E NB20E 35 750 hrs projected NB25E 26 533 hrs projected MTTR 0 5 hrs PHYSICAL PROPERTIES Dimensions 3 2H x 17 0W x 12 4D inches 8 13 x 38 1 x 31 5 cm Weight Unit 7 lbs 3 17 kg Shipping 8 lbs 3 63 kg ...

Page 21: ... remove the bridge from the shipping box Save the shipping box and materials in the event the unit has to be reshipped 2 Slide the two foam end caps off of the bridge and remove the bridge from its protective plastic bag Set the bridge aside to prevent the unit from being damaged 3 Remove the plastic bag containing the accessory package and check that the bag contains the following items one 8 foo...

Page 22: ... four rubber feet to the bridge This frees the top plastic housing 1 from the bridge 2 Carefully remove the top plastic housing 3 Remove the four screws 6 holding the bottom plastic housing 4 to the bridge s chassis Figure 3 1 Rack Mount Brackets Installation 1 Top Housing 5 Screws 4 2 Screws 4 6 Screws 4 3 Rack Mount Bracket 7 Rack Mount Bracket 4 Bottom Plastic Housing ...

Page 23: ...h the front of the bridge 3 2 2 Cable Support Installation To install the cable support 1 Remove the four cable support screws 3 Fig 3 2 from the bridge 1 2 Attach the cable support 2 to the rear of the bridge using the screws removed in step 1 3 2 3 Connecting The Bridge To The Network To connect the bridge to the network 1 For each network segment to be connected to the bridge attach an external...

Page 24: ...t the Forward Broadcast and Root switches to the appropriate On or Off O position as defined below If you want the bridge to pass Broadcast messages between segments set the FORWARD BROADCAST switch Fig 3 4 to the On position If you want this bridge to receive priority over all other bridges on the network set the ROOT switch Fig 3 4 to the On position Only ONE bridge on the network should have th...

Page 25: ...le to the on position 4 Observe the status of the ON LINE STANDBY PORT 1 OK and PORT 2 OK LEDs These LEDs will flash for approximately 10 seconds as the bridge performs it s internal diagnostics When the bridge finishes its internal diagnostics the LEDs should be in the following conditions ON LINE LED lit indicating that the bridge is receiving power PORT 1 OK and PORT 2 OK lit indicating that th...

Page 26: ...n properly initialized A PORT OK LED is not lit indicating that the port failed the loopback test and that the Network Interface Chip for that port failed If any of these conditions exist contact Cabletron Systems Technical Support When power connection is complete use the cable ties that are provided to strain relief all cables to the cable support 2 Fig 3 2 to relieve unnecessary pressure at cab...

Page 27: ... NB20E or NB25E to ensure that the segments meet IEEE 802 3 specification limits 1 Move the Forward Broadcast switch on the front panel of the Bridge Fig 4 1 to the On position This will allow broadcast messages sent by the LAN MDs to pass through the bridge 2 Using a transceiver 1 Fig 4 2 and an AUI cable connect a LAN MD 2 to one of the segments connected to the bridge 3 3 Select and run test 6 ...

Page 28: ...NB25E have successfully completed these tests the bridge is ready for normal operation If any failures were noted please contact Cabletron Systems Technical Support 4 2 USING LANVIEW The NB20E and NB25E Two Port Ethernet Bridges use Cabletron Systems built in visual diagnostic and status monitoring system called LANVIEW With LANVIEW network troubleshooting personnel can quickly scan LANVIEW s LEDs...

Page 29: ...o that network segment RECEIVE RCV LED When this yellow LED is flashing bridge is receiving a data packet from that segment COLLISION PRESENT CP LED When this red LED is flashing a collision is occurring on that segment PORT OK POK LED This green LED is lit to indicate that the transceiver is connected and that the port has passed an internal Loop Back Test and is ready for transmission 4 3 USING ...

Page 30: ...or a particular bridge allows the user to set that bridge as the root bridge Only one bridge can serve as the root bridge in a multiple bridge environment however In the event that two bridges have been selected as root bridges the bridge in the environment with the lowest identifier will become the root bridge ...

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