MR9T IEEE 802.3 10BASE-T MR9T-C IEEE 802.3 10BASE-T/10BASE-2 MULTIPORT REPEATER INSTALLATION GUIDE CABLETRON SYSTEMS, P. O.
NOTICE NOTICE 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.
FCC NOTICE FCC NOTICE WARNING: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 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 operator’s manual, may cause harmful interference to radio communications.
CONTENTS CONTENTS CHAPTER 1 INTRODUCTION 1.1 1.2 1.3 Using This Manual ....................................................................1-1 Getting Help ...............................................................................1-2 Overview .....................................................................................1-2 CHAPTER 2 SPECIFICATIONS AND REQUIREMENTS 2.1 2.2 2.3 Specifications..............................................................................
INTRODUCTION CHAPTER 1 INTRODUCTION The MR9T-C 10BASE-T/10BASE-2 Multiport Twisted Pair Repeater (Figure 1-1) and the MR9T 10BASE-T Multiport Twisted Pair Repeater (Figure 1-2) conform to all applicable IEEE 802.3 specifications. Each repeater has nine ports. Ports 1 through 8 on both models are 10BASE-T compliant RJ-45 ports. Port 9 is where the two repeater models differ. Port 9 on the MR9T has an RJ-45 connector. In addition, the MR9T has a special switch that alters the pin configuration of Port 9.
INTRODUCTION 1.2 GETTING HELP If you need additional support related to the MR9, or if you have any questions, comments, or suggestions related to this manual, contact Cabletron Systems Technical Support. Before calling, please have the following information ready: • The product type (MR9T or MR9T-C) and the product serial number. The serial number is located on the front panel of the repeater.
INTRODUCTION PWR MR9T-C RCV CLN LNK PORT 9 8 7 6 5 4 3 2 1 POWER INPUT 802.3 10BASE-T/10BASE2 MULTI PORT REPEATER WITH LANVIEW THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.
INTRODUCTION The MR9 functions include the following: • Transmit re-timed data packets • Regenerate the preamble • Extend collision fragments • Automatically partition problem segments • Reconnect non-problem segments The auto-segment/auto-reconnect feature ensures that if a problem develops on a segment connected to the MR9, just those devices on that segment are affected. When the problem is solved, those users are automatically reconnected to the network.
SPECIFICATIONS/REQUIREMENTS CHAPTER 2 SPECIFICATIONS AND REQUIREMENTS 2.1 SPECIFICATIONS Listed below are the electrical and physical specifications of the MR9. Cabletron Systems reserves the right to change these specifications at any time without notice. General Specifications Delay times (any segment in to all segments out) Start of packet: 700 ns Collision to JAM: 700 ns Preamble Input: 40 bits minimum to 64 bits maximum. Output: 64 bits minimum (last 2 bits are 1,1).
SPECIFICATIONS/REQUIREMENTS Twisted Pair Connectors Type: RJ-45 port, for use with twisted pair cable. See Figure 2-1. RJ-45 Port Pin Configuration: MR9T Port 9 Figure 2-1 shows the MR9T Port 9 straight-through pin configuration, as indicated by ‘=’ on the switch label. Figure 2-2 shows cross-over RJ-45 Port pin configuration, ‘X’ on the switch label. Port 9 of the MR9T is selectable for cross-over or straightthrough configuration.
SPECIFICATIONS/REQUIREMENTS 12345678 Port 9 Switched for Crossed-Over Operation (X) Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 RX+ RXTX+ No Connection No Connection TXNo Connection No Connection Figure 2-2. RJ-45 Port Cross-Over Pin Configuration BNC Interface (Port 9, MR9T-C) Type: BNC receptacle, with gold center contact, for use with BNC type plugs and RG-58 thin-net cable. Terminations: Internally connected to a switchselectable 50 ohm terminator.
SPECIFICATIONS/REQUIREMENTS Power Supply Input Power USA: 90 - 135 Vac, 50-60 Hz at 19.0 W Input Power UK: 216 - 264 Vac, 50 Hz at 13 W Input Power Europe: 180 - 240 Vac, 50 Hz at 13 W Output Power: 0.9 amp at 15 Vdc Operating Temperature Range: 0° to 70°C Note: The power source for the MR9 is to be certified for use in the country of installation with a SELV output of 15V DC and capable of providing a minimum of 900mA.
SPECIFICATIONS/REQUIREMENTS 2.2 10BASE-T NETWORK DESIGN GUIDELINES: MR9T Transceivers and network devices that connect to the MR9T must meet IEEE 802.3 standards. Your network must meet the following IEEE 802.3 10BASE-T Twisted Pair requirements when connecting devices with the MR9T. • Segment Length - The IEEE 802.3 10BASE-T standard requires that 10BASE-T devices support a 100 meter (328 feet) minimum link length using 22-26 AWG unshielded twisted pair wire.
SPECIFICATIONS/REQUIREMENTS • Noise - Noise is caused by either crosstalk (signal coupling between the different cable pairs in a multi-pair cable, or externally induced impulses. External noise can cause data errors if impulses occur at very specific times during data transmission. Generally you do not have to be concerned about noise. If you suspect noise related problems, reroute the cable or eliminate the source of the impulse noise.
INSTALLATION CHAPTER 3 INSTALLATION When you unpack the MR9, verify that you have received the following: • One 15 Vdc, 0.9 Amp wall mount transformer with attached power cord • Two sets of Velcro mounts • Ten 6 inch tie wraps • Four cable clamps After you are sure that you have met all requirements listed in Chapter 2, Specifications and Requirements, complete the installation instructions provided in this chapter. 3.
INSTALLATION 3.2 CONNECTING THE MR9 TO THE POWER SOURCE To connect the repeater to the power source: 1. Plug the power cord (Figure 3-1) into the power receptacle located on the side of the MR9. 2. Plug the power cord into a wall receptacle. After you have made the power connection, verify that the PWR LED is lit, indicating that the repeater is receiving power. 3.
INSTALLATION 3.4 CONNECTING CABLES In a typical application, the MR9 connects up to eight Ethernet devices to the Ethernet network. One port connects the repeater to the network while the other ports connect to Ethernet devices such as PC network interface cards. Usually, Port 9 is used as the connection to the network. In operation, Port 9 is the same as any other port; you can use any port for the network connection. Port 9 does have features which make it unique.
INSTALLATION transceiver or PC network interface card. Figure 3-3 shows a representation of a typical twisted pair repeater installation. Pins 1, 2, 3, and 6 in an RJ-45 connector are the pins used to carry the signals. Repeater Port 1X connects to a transceiver, which connects to a PC network interface card. The Repeater Port 9 configuration select switch is set to straight-through (=).
INSTALLATION Connect the other end of the twisted pair segment to any port on the front of the MR9T. If you are using MR9T Port 9, make sure that the configuration switch on the side of the MR9T is set correctly, either cross-over (X) or straight-through (=). If you are unsure of the proper setting for your application, check the pin configurations of the RJ-45 ports at each device to be connected. Make sure that you are connecting TX+ to RX+, TX- to RX-, RX+ to TX+, and RX- to TX-.
INSTALLATION e. Reconnect the cable segment to the repeater and the network device. If a link has not been established, contact Cabletron Systems Technical Support. 3.6 CONNECTING TWISTED PAIR SEGMENTS TO RJ-45 PORTS To connect a workstation or other device to the MR9: 1. Use a twisted pair segment with RJ-45 connectors at each end. Connect one end of the cable to any RJ-45 port on the MR9. Connect the other end of the segment to a 10BASE-T device.
USING LANVIEW CHAPTER 4 USING LANVIEW The MR9 uses Cabletron Systems’ built-in diagnostic and status monitoring system, LANVIEW. The LANVIEW indicators give you a visual indication of network status and problems. This chapter explains how to use the LANVIEW indicators to monitor network activity and help troubleshoot network problems on the physical layer. 4.1 THE LANVIEW INDICATORS The following explains the purpose of each LANVIEW LED on the MR9. See Figure 4-1.
USING LANVIEW Receive (RVC) LED This yellow indicator normally flashes to indicate that the MR9 is repeating data packets received from that segment. The flash of the LED is pulse stretched for viewing effect. MR9T PWR 802.3 10BASE-T MULTIPORT REPEATER WITH LANVIEW CLN RCV LNK PORT 9 8 7 6 5 4 3 2 1 Figure 4-1.
