Related Manuals for Cabletron Systems NB20E
Summary of Contents for Cabletron Systems 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 3 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.
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Page 4: Fcc Notice
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. WARNING: This equipment uses and generates and can radiate radio frequency energy and if not installed properly and used in accordance with the instruction manual, may cause interference to radio... -
Page 5: Table Of Contents
CHAPTER 1 INTRODUCTION USING THIS MANUAL ... 1-1 GETTING HELP ... 1-2 THE NB20E AND NB25E TWO PORT ETHERNET BRIDGE ... 1-2 THE BRIDGE FILTERING METHOD ... 1-3 MULTIPLE BRIDGE ENVIRONMENTS ... 1-5 1.5.1 The Root Bridge... 1-5 1.5.2 Primary and Redundant Data Paths ... 1-6 REMOTE LANVIEW ... - Page 6 CONTENTS...
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Page 7: Chapter 1 Introduction
Welcome to the Cabletron Systems NB20E™ and NB25E™ Two Port Ethernet Bridges User's Manual. We have designed this user’s manual to serve as a simple installation and reference guide for the NB20E and NB25E, and to explain the capabilities and special features of each individual bridge. -
Page 8: Getting Help
INTRODUCTION GETTING HELP If you need additional support related to the Cabletron Systems NB20E or NB25E Two Port Ethernet Bridge, or if you have any questions, comments or suggestions related to this manual, feel free to contact Cabletron Systems' Technical Support at: Cabletron Systems Inc. -
Page 9: The Bridge Filtering Method
This process begins with the creation of a list of local node addresses in a table referred to as the Source Address Table. When the NB20E or NB25E first goes on line, the bridge initially forwards all packets through the bridge. As the bridge receives a packet, it... - Page 10 INTRODUCTION NODE A NODE B In this example, when Node A sends a packet to Node B, the bridge learns Node A’s source address and adds the address to the Source Address Table, indicating that the node is on LAN 1. If Node C subsequently sends a packet to Node A, Node A’s address will be detected in the Source Address Table for LAN 1 and the packet will not be forwarded across the bridge to LAN 2.
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Page 11: Multiple Bridge Environments
Management for the Cabletron Systems' NB20E and NB25E. MULTIPLE BRIDGE ENVIRONMENTS Both the NB20E and NB25E Two Port Bridges are designed to promote maximum network use in multiple bridge environments. A bridge learns the bridge topology of its network from bridge protocol data that is transmitted onto the network by each bridge. -
Page 12: Primary And Redundant Data Paths
Figure 1-2 provides a sample illustration of how a potential data loop is prevented in a simple multibridge environment. A data loop exists NODE A BRIDGE 1 NB20E OR 25E Figure 1-2 Multiple Bridging Environments NB20E OR 25E BRIDGE 3... -
Page 13: Remote Lanview
Bridge 2. REMOTE LANVIEW Both the NB20E and the NB25E can be controlled and managed by Cabletron Systems' optional Remote LANVIEW - Network Control Management for the Cabletron Systems' Bridges. Remote LANVIEW allows you to control and manage multiple NB20Es or NB25Es from a single Ethernet Workstation through Cabletron System NCM-DOS™... -
Page 14: Related Manuals
INTRODUCTION For further information for refer to the Remote LANVIEW - Network Control Management for the Cabletron Systems' NB20E and NB25E User's Manual. RELATED 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. -
Page 15: Chapter 2 Installation Requirements/ Specifications
Also refer to the operating specifications and environmental requirements that are listed. All conditions, guidelines, specifications and requirements included in this chapter must be met to ensure satisfactory performance of the NB20E or NB25E. Failure to follow these guidelines will result in unsatisfactory network performance. -
Page 16: Operating Specifications
INSTALLATION REQUIREMENTS/ SPECIFICATIONS OPERATING SPECIFICATIONS The operating specifications for Cabletron Systems' NB20E or NB25E Two Port Bridge Series are included in this section. Cabletron Systems reserves the right to change these specifications at any time without notice. GENERAL Parameter Packet Buffer Memory (RAM): 128K... -
Page 17: Front Panel Indicators
INSTALLATION REQUIREMENTS/ SPECIFICATIONS FRONT PANEL INDICATORS ON LINE STAND BY NOTE: There is one TRANSMIT, RECEIVE, COLLISION, and POK (Port OK) LED for each segment. The LEDs for RECEIVE, TRANSMIT and COLLISION are pulsed-stretched for increased viewing effect. XMT (transmit) RCV (receive) CP (collision present) POK (port ok) - Page 18 INSTALLATION REQUIREMENTS/ SPECIFICATIONS FRONT PANEL SWITCHES (cont.) ROOT | / O AUI PORT (NB20E/NB25E) Interface Connector Type: Pin 1 Logic Ref. 2 Collision + 3 Transmit + 4 Logic Ref. 5 Receive + 6 Power return 7 No Connection 8 Logic Ref...
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Page 19: Environmental Requirements
INSTALLATION REQUIREMENTS/ SPECIFICATIONS POWER SUPPLY REQUIREMENTS Parameter 120V Input Voltage: 120 V Input Current NB20E: NB25E: Frequency Range: 220V Input Voltage: 220 V Input Current NB20E: NB25E: Frequency Range: Overload Protection Input: Output: ENVIRONMENTAL REQUIREMENTS Operating Temperature: Non-operating Temperature: -30 to +90 C... - Page 20 TUV, VDE class A. Meets FCC part 15, Subparagraph J, Class A limits. WARNING: It is the responsibility 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.
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Page 21: Chapter 3 Installing The Nb20E Or Nb25E Bridge
INSTALLING THE NB20E OR NB25E BRIDGE This section contains instructions for installing Cabletron Systems' NB20E or NB25E Two Port Ethernet Bridge, and for preparing the bridge for operation. Verify that all network design guidelines and site requirements listed in Chapter 2, Installation Requirements/ Specifications, are met before installing the bridge. -
Page 22: Installing The Rack Mount Brackets
3.2.1 Installing the Rack Mount Brackets If the NB20E or NB25E will be rack mounted: 1. Remove the four screws (5, Fig. 3-1) holding the four rubber feet to the bridge. This frees the top plastic housing (1) from the bridge. -
Page 23: Cable Support Installation
4. Remove the NB20E or NB25E from the bottom housing. 5. Remove the four screws (2) that secure the cover to the front of the bridge. The screws are located on the left and right sides of the bridge (closest to the front side), two per side. -
Page 24: Setting The Mode Switches
2. Attach an AUI cable (2, 8) no more than 50 meters in length to each of the transceivers that you connected to each network segment. 3. Connect the AUI cable from the transceiver to the AUI port (4, 5) located on the back panel of the NB20E or NB25E bridge. 3.2.4 Setting The Mode Switches... -
Page 25: Connecting The Nb20E Or Nb25E To The Power Source
3.2.5 Connecting The NB20E or NB25E To The Power Source When installation of the NB20E/NB25E Bridge is complete and the switches have been set, connect the bridge to the power source in the following manner: 1. If you have not already done so, plug the power cord (7, Fig. 3-3) into the power receptacle (6) located on the rear panel of the bridge. - Page 26 (2, Fig. 3-2) to relieve unnecessary pressure at cable connection points. The NB20E or NB25E Bridge is now ready for operation. Before transmitting data, test the installation. For this procedure, refer to the...
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Page 27: Chapter 4 Testing And Lanview
TESTING AND LANVIEW This section contains procedures to test the NB20E or NB25E Two Port Ethernet Bridge after it has been connected to the network. A description of the LANVIEW LEDs, the Forward Broadcast, and the Root Switch, is also provided. -
Page 28: Using Lanview
LAN-MD to the other LAN-MD, acting as the Server, then echoed back. When the NB20E or NB25E have successfully completed these tests, the bridge is ready for normal operation. If any failures were noted, please contact Cabletron Systems' Technical Support. -
Page 29: Using The Forward Broadcast Switch
When this yellow LED is lit, the bridge is in the “Stand by” mode and not capable of forwarding packets. NOTE: There are separate XMT, RCV, CP, and POK LEDs for each port on the NB20E and NB25E. TRANSMIT (XMT) LED When this green LED is flashing, the bridge is transmitting packets to that network segment. -
Page 30: Using The Root Switch
TESTING AND LANVIEW USING THE ROOT SWITCH In a multiple-bridge environment, the Root switch, Figure 4-1, for 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.
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