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Power
10BASE-T ADSL
Megabit Modem CRA-C
User Manual
Manual Number: 425-613-150-02
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Megabit Modem CRA-C User Manual P/N 425-613-150-02 Revision 02 May 1998 Copyright © 1998. PairGain Technologies, Inc. All rights reserved. This document contains proprietary information which is protected by copyright. Information contained in this document is company private to PairGain Technologies, Inc. and shall not be modified, used, copied, reproduced or disclosed in whole or in part without the written consent of PairGain. PairGain is a registered trademark, and Megabit Modem is a trade
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FCC NOTICE This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with this instruction manual, may cause harmful interference to radio communication. Howe
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DECLARATION OF CONFORMITY Manufacturer’s name PairGain Technologies, Inc. and address: 14402 Franklin Ave Tustin, CA 92780-7013 U.S.A. declares that Product name: Megabit Modem CRA-C conforms to the following Standards: EN55022 (1987), EN50082-1 (1992), EN60950 (1994) Application of Council Directives: 89/336/EEC, 73/23/EEC I, the undersigned, hereby declare that the equipment specfied above conforms to the above directives and standards. Signature: Roy Stephens, Director of Quality Assurance Pl
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USING THIS MANUAL This manual helps you: ® • understand the features of the PairGain Megabit Modem™ CRA-C and how the unit operates as a component within a network • install the Megabit Modem CRA-C • configure your unit to operate within the network • contact PairGain if you need additional help Three types of messages with icons appear in the text: Notes inform you of special circumstances. Cautions indicate the possibility of damage to equipment. Warnings indicate the possibility of personal i
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Using This Manual vi Megabit Modem CRA-C User Manual
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CONTENTS ABOUT THE MEGABIT MODEM CRA-C __________________ 1 About Rate Adaptive Transmission..................................... 2 Rate Adaptation.............................................................. 2 Reach, Data Rate, SNR Margin, and Noise Environment............................................ 4 INSTALL THE MEGABIT MODEM CRA-C_________________ 7 Unpack and Inspect the Shipment ....................................... 7 Identify LEDs and Connectors.....................................
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Contents NETWORK AND MANAGEMENT OVERVIEW____________ 51 MAC Layer Bridging and Spanning Tree Protocol............ 51 Static IP Routing............................................................... 53 Megabit Modem CRA-C IP Addresses.......................... 59 Management Protocols...................................................... 61 SNMP........................................................................... 61 Megabit Modem CRA-C SNMP Agent ......................... 62 MIB and Trap Sup
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ABOUT THE MEGABIT MODEM CRA-C ® The PairGain Megabit Modem™ CRA-C uses Asymmetric Digital Subscriber Line (ADSL) technology to provide, on a single pair telephone line, a multi-megabit Ethernet connection between the subscriber and the service provider. The Megabit Modem CRA-C transmits data up to 3.16 Mbps from a service provider and receives data up to 1.08 Mbps from a subscriber. The Megabit Modem CRA-C is rate adaptive; its speed is adjusted to the maximum attainable data rate depending on
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About the Megabit Modem CRA-C Use the Megabit Modem CRA-C with these other PairGain products: • Megabit Modem CRA (at subscriber site) S1 Network Interface Device (network interface at subscriber site) • About Rate Adaptive Transmission The following definitions are useful for understanding the operation of the Megabit Modem: • Bit Error Rate (BER) is the ratio of received bits that are in error relative to the total number of bits received, measured over time. -7 For example, 10 BER means that
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About the Megabit Modem CRA-C The Megabit Modem CRA-C can be set to any one of three modes that determine how the data rate is selected. It is important to note that rate adaptation occurs only during startup. The Megabit Modem CRA-C will not change its data rate while the link is up. The three startup modes are: • Full startup always: In the full startup mode, the system figures out the highest upstream and downstream data rates it can support under the current line conditions, with a margin
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About the Megabit Modem CRA-C Reach, Data Rate, SNR Margin, and Noise Environment The maximum transmission rate of the Megabit Modem CRA-C is determined by distance, SNR margin, and the condition of the line (wire gauge, condition noise environment). Figure 1 shows the relationship between reach and data rate for a given set of conditions. The plots can be used to determine the achievable reach at a given data rate, or they may be used to determined the achievable data rates at a given distan
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About the Megabit Modem CRA-C Figure 1. Reach for a Rate Adaptive ADSL Megabit Modem Megabit Modem CRA-C User Manual 5
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About the Megabit Modem CRA-C 6 Megabit Modem CRA-C User Manual
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INSTALL THE MEGABIT MODEM CRA-C Install the Megabit Modem CRA-C using these sections: For information about this topic Go to page Unpack and inspect the shipment 7 Identify LEDs and connectors 9 Install the Megabit Modem CRA-C 12 Power up and check LEDs 16 Unpack and Inspect the Shipment Upon receipt of the equipment: 1 Unpack each container and visually inspect it for signs of damage. If the equipment has been damaged in transit, immediately report the extent of damage to the transportation co
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Install the Megabit Modem CRA-C Table 1. Cables for Megabit Modem CRA-C Item Description Function Straight-through Black unshielded Connects the Megabit Modem Category 3 cable twisted-pair (UTP) CRA-C Ethernet MDI-X port cables terminated with to a network device with an RJ-45 connectors. MDI port. Cross-over Yellow UTP cable Connects the Megabit Modem Category 5 cable terminated with RJ-45 CRA-C Ethernet MDI-X port connectors. to a network device with an MDI-X port. ADSL cable Gray UTP cable C
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Install the Megabit Modem CRA-C Identify LEDs and Connectors The Megabit Modem CRA-C front panel has LEDs that show status for power and data transmission. The rear panel has external interface connectors and a power switch. Front Panel Figure 2 and Table 2 describe the LEDs on the Megabit Modem CRA-C front panel. Figure 2. Megabit Modem CRA-C Front Panel Megabit Modem CRA-C User Manual 9
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Install the Megabit Modem CRA-C Table 2. Front Panel LEDs LED Mode Description Power Green Indicates power is on. 10BASE-T LINK Green Ethernet connection up. Off Ethernet connection down. TX Green Transmit activity at port. Off No transmit activity at port. COL Green Collisions occurring on the port. Off No collisions occurring on the port. ADSL SYNC Solid green Normal operation. Flashing green Training in progress. Off Megabit Modem CRA not synchronized with Megabit Modem CRA-C. STAT Solid gre
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Install the Megabit Modem CRA-C Rear Panel Figure 3 and Table 3 describe the Megabit Modem CRA-C rear panel features. Figure 3. Megabit Modem CRA-C Rear Panel Table 3. Rear Panel Components Name Function POWER connector 6-pin mini-DIN type port that supplies power to Megabit Modem CRA-C. Do not connect any other wall-plug supply to the Megabit Modem CRA-C unit, otherwise, you can permanently damage the unit. ON/OFF switch Toggle switch used to turn modem ON and OFF. CONSOLE port RJ-45 connecto
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Install the Megabit Modem CRA-C Install the Megabit Modem CRA-C Complete the steps in the order listed to install the Megabit Modem CRA-C: • connect to the ADSL line • connect to the data network Connect to the ADSL Line The Megabit Modem CRA-C requires a single pair of telephone wires to connect the subscriber to the service provider. One wire is the Tip and the other is the Ring. See Table 4 for pinouts. Connect the Tip and Ring wires to your Megabit Modem CRA-C: 1 Plug the RJ-45 connector
