Megabit Modem CRA-C User Manual Po we r 10 BA SE -T AD SL Manual Number: 425-613-150-02
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.
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.
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.
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.
Using This Manual vi Megabit Modem CRA-C User Manual
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 ............................................
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 Support ..
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.
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.
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.
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 distance.
About the Megabit Modem CRA-C Figure 1.
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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.
Install the Megabit Modem CRA-C Table 1. Cables for Megabit Modem CRA-C Item Description Function Straight-through Category 3 cable Black unshielded twisted-pair (UTP) cables terminated with RJ-45 connectors. Connects the Megabit Modem CRA-C Ethernet MDI-X port to a network device with an MDI port. Cross-over Category 5 cable Yellow UTP cable terminated with RJ-45 connectors. Connects the Megabit Modem CRA-C Ethernet MDI-X port to a network device with an MDI-X port.
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.
Install the Megabit Modem CRA-C Table 2. Front Panel LEDs LED Mode Description Power Green Indicates power is on. Green Ethernet connection up. Off Ethernet connection down. Green Transmit activity at port. Off No transmit activity at port. Green Collisions occurring on the port. Off No collisions occurring on the port. Solid green Normal operation. Flashing green Training in progress. Off Megabit Modem CRA not synchronized with Megabit Modem CRA-C. Solid green Normal operation.
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.
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.
Install the Megabit Modem CRA-C Table 4. ADSL Pin Assignments for RJ-45 Connector Pin Signal 1 Not Used 2 Not Used 3 Not Used 4 ADSL (Ring) 5 ADSL (Tip) 6 Not Used 7 Not Used 8 Not Used Connect to the Data Network The 10BASE-T MDI-X port connects the Megabit Modem CRA-C to the data network. If the data network has an MDI-X port, use the yellow cross-over Category 3 or better cable. If the data network has an MDI port, use the black straight-through Category 3 or better cable.
Install the Megabit Modem CRA-C Figure 5.
Install the Megabit Modem CRA-C Connect to the data network using either the black straight-through cable or the yellow cross-over cable: 1 Plug the RJ-45 connector of the Category 3 cable into the 10BASE-T MDI-X connector on the Megabit Modem CRA-C rear panel (Figure 6). 2 Attach the other end of the Category 3 cable to the 10BASE-T port of your data network. Figure 6.
Install the Megabit Modem CRA-C Power Up and Check LEDs Install the power cable and power up the Megabit Modem CRA-C: 1 Plug the mini-DIN connector on the wall-plug supply into the power connector on the rear of the Megabit Modem CRA-C, then plug the wall-plug supply into the facility power. Do not connect any other wall-plug supply to the Megabit Modem CRA-C. If you use another wall-plug supply, you can permanently damage the unit. 2 Turn ON the ON/OFF switch on the rear panel.
CONFIGURE AND VIEW STATUS In this chapter, you configure the Megabit Modem CRA-C or view system status using an ASCII terminal connected to the console port.
Configure and View Status Figure 7. Connecting to an ASCII Terminal 4 5 18 Configure these communication settings for the ASCII terminal: • 9600 to 19,200 baud • no parity • 8 data bits • stop bit • flow control to OFF Select ANSI for terminal emulation.
Configure and View Status How to Log On and Navigate the Menus This section shows you how to log on and then how to navigate the menu structure. Every console screen has a menu header which displays the time in the upper right corner and the date in the upper left corner. Through the menus, you can configure a local and a remote modem.
Configure and View Status ENTER is the factory-default password. If you establish a different password, you must type the new password at the LOGON PASSWORD prompt on a subsequent log on. 2 Type your password at the password prompt or press ENTER (factory default password) if you have not customized your password. The Main Menu displays. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:43:18 01.01 MAIN MENU 1. 2. 3. 4.
Configure and View Status Figure 8 shows the structure for the Megabit Modem CRA-C menus. Type the number of the menu item you want to view or configure. Figure 8.
Configure and View Status Table 6 shows the ASCII terminal key functions used to navigate the menus and to select settings. Table 6. Keyboard Functions Key Function ESC Restores the parameter to the last saved setting. Applies to parameters where you type a value but not to parameters you toggle. M Goes to Main Menu. Q Performs a log out from the Main Menu. R Returns to the next higher-level menu. Ctrl R Refreshes the current screen. Ctrl T Toggles between ATU-C and ATU-R menus.
Configure and View Status How to Configure a Remote Unit From the Megabit Modem CRA-C, you can view system parameters and set configuration options for the remote Megabit Modem CRA. The remote console menu header reflects the remote unit as ATU-R. This shows that the console program is physically connected to the unit at the service provider site (ATU-C), but is virtually configuring the unit at the subscriber site (ATU-R).
Configure and View Status Configure the System Settings This section describes configurable system settings. You can change factory default settings like time and date, or create a password and unique ID for the unit. 1 On the Main Menu, type 1 to display the System Status and Configuration menu. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:43:23 01.01 SYSTEM STATUS AND CONFIGURATION 1. SYSTEM INFORMATION 2.
Configure and View Status 3 Do the following for each system setting option you want to change: Type the number of the option you want to configure. Type the appropriate information for each option as indicated in Table 7 then press ENTER . Table 7. System Configuration Options Type No. For Option Function 1 Change System Time Type the new time in the 24-hour clock format hh:mm:ss at the prompt. The new time shows in the upper right corner of the screen.
Configure and View Status Configure the ADSL Transceiver The ADSL menu provides access to set ADSL configuration parameters and to view ADSL performance and alarm status (menu options 1 through 4). See "View Status" (page 41) for more information on options 1 through 4. Configure parameters for ADSL data transmission in the "Configuration" section that follows. Then, reset the Megabit Modem CRA-C to make the changes effective using the "Reset the ADSL Transceiver" section (page 29).
Configure and View Status 2 Do the following for each system setting option you want to change: • • 3 Type the number of the option you want to configure. Select, using the spacebar, or type the appropriate information for each option as indicated in Table 8 then press ENTER . After you type R or M and have made changes to the ADSL transceiver, you are prompted Save current settings (Y/N)? Type Y for yes or N for no. You then return to the ADSL Menu. Table 8. ADSL Transceiver Options Type No.
Configure and View Status Table 8. ADSL Transceiver Options (continued) Type No. For Option Function 3* Max Down Data Rate Select a maximum data rate for the downstream channel (from service provider to subscriber). Use the spacebar to scroll through the available rates. 4 Startup SNR Margin Press the spacebar to select a startup SNR margin from –3 to 9 dB or NA (don't care about startup SNR margin). The default is 6 dB. 5 Margin Threshold Type a dB value from 0 to 15.
Configure and View Status Reset the ADSL Transceiver When you change any of the options 1 through 4 at the ADSL Menu, Reset the ADSL transceiver to make the changes effective and re-establish the ADSL link. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:44:57 01.01 ADSL MENU 1. 2. 3. 4. 5. 6. 7.
Configure and View Status Configure the Bridge/Router This section describes how to configure the Ethernet interface (bridge) of the modem as either a bridge or a router. Then, configure the management protocol options through the SNMP Configuration menu. On the Main Menu, type 3 to display the Bridge/Router Menu. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:55:55 01.
Configure and View Status Configure as a Bridge Configure Bridge parameters at the Bridge/Router Menu. Bridge configuration options are maintained and restored through the system's local service port and are kept in NVRAM to be used in subsequent initializations. 1 Type 1 at the Bridge/Router Menu to display the Bridge Configuration Menu. 2 Type 1 , press the spacebar to toggle to Bridge, then press ENTER . At the prompt, Save current setting (Y/N), type Y to display this screen.
Configure and View Status Table 10. Bridge Configuration Type No. For Option Function 2 Local IP Addr Configure for the modem to respond to an application that uses IP protocol including SNMP and TFTP. The default is 0.0.0.0. You can either type in the address supplied by a system administrator or get the IP address via the boot server when boot mode is set to Network. 3 Local Subnet Mask Determines if a host (TFTP server, SNMP management station, or trap receiver) is on the same local subnet.
Configure and View Status Table 10. Bridge Configuration (continued) Type No. For Option Function 9 Image File Name Read-only value. This parameter can be configured only in the BOOTP configuration file and is acquired when Boot Mode and Image Load Mode are set to network. This name must match the name of a file on the TFTP server in order for an image file download to occur. A Image Load Mode Specifies how the operational image code is loaded for the Ethernet bridge.
Configure and View Status Configure as a Router Configure Router parameters at the Bridge/Router Menu. Router configuration options are maintained and restored through the system's local service port and are kept in NVRAM to be used in subsequent initializations. 1 Type 1 at the Bridge/Router Menu to display the Bridge/Routing Configuration Menu. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:54:33 01.
Configure and View Status The following screen shows configuration for a Megabit Modem CRA (ATU-R) routed toward a Megabit Modem CRA-C (ATU-C), using IP addresses from the example in Figure 12. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-R ADSL MEGABIT MODEM TERMINAL 08:54:33 01.01 BRIDGE/ROUTING CONFIGURATION MENU --------------------------------------------------------------MODE SETTING 1. BRIDGE/ROUTER MODE ROUTER IP STATIC ROUTING DESTINATION SUBNET MASK GATEWAY ADDRESS TABLE 2. DEFAULT 172.16.100.1 3. 0.0.
Configure and View Status Table 11. Router Configuration Type No. For Option Function 2 Default Contains the address of the default gateway 3 4 5 IP Static Routing Table Consists of the Destination, Subnet Mask, and Gateway. Must be configured for the Megabit Modem CRA-C to operate as a static IP router. 0.0.0.0 is the format for each field and the default. 6 LAN IP Addr Input the network address of the Megabit Modem CRA-C 10BASE-T port.
Configure and View Status Table 11. Router Configuration (continued) Type No. For Option Function C Image File Name Read-only parameter. The name must match the name of a file on the TFTP server for an image file download to occur. D Image Load Mode Specifies how the Ethernet bridge code is loaded. The Megabit Modem CRA-C supports both local and remote loading. Local image code is contained in flash devices for local loading of operation code.
Configure and View Status Configure SNMP Configure SNMP parameters and trap addresses at the SNMP Configuration menu. 1 Type 2 at the Bridge/Router Menu to display the SNMP Configuration Menu. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:53:26 01.01 SNMP CONFIGURATION MENU --------------------------------------------------------------SETTINGS 1. 2. 3. 4. 5. 6. 7.
Configure and View Status Table 12. SNMP Configuration Options No. For Option Function 1 SNMP Read Only Comm String Provides the authentication string used for SNMP read-only operations. At the prompt NEW COMMUNITY STRING:, type in appropriate community string. Typically, use either Public or Private. The read-only community string setting must match the network manager community string setting of Public or Private.
Configure and View Status Reset the Ethernet Bridge Changes you make to the Ethernet bridge through the Bridge/Router Configuration menus (pages 31 and 37) and SNMP Configuration menu (page 38) write immediately to flash memory when changes are confirmed. However, they do not take effect until the Megabit Modem CRA-C Ethernet bridge is reset. The Reset option causes the bridge to reboot with the new configuration.
Configure and View Status View Status This section describes status menus. You can view information such as current alarm status, performance history, and product information. See the following section for: system information (page 41) ADSL transceiver status (page 42) Ethernet bridge statistics (page 48) System Information The System Information screen provides general product information for the units at both the service provider (ATU-C) and subscriber (ATU-R) sites.
Configure and View Status ADSL Transceiver Status From the Main Menu, type 2 to display the ADSL Menu. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:44:57 01.01 ADSL MENU 1. 2. 3. 4. 5. 6. 7. ADSL PERFORMANCE STATUS 24 HOUR ADSL PERFORMANCE HISTORY 7 DAY ADSL PERFORMANCE HISTORY ADSL ALARM HISTORY ADSL TRANSCEIVER CONFIGURATION MENU FULL ADSL RESET SESSION ADSL RESET (M)ain ENTER CHOICE--> Select options 1 through 4 to view status for the ADSL transceiver.
Configure and View Status ADSL Performance Status. The ADSL Performance Status screen is updated every second and provides a summary of the ADSL parameters and outstanding ADSL-related alarms. This screen displays the upstream and downstream ADSL links. The SNR (signal-to-noise ratio) margin column displays both the current SNR margins as well as the minimum SNR margins for the current 24-hour period. Press 1 on the ADSL Menu to display the ADSL Performance Status screen.
Configure and View Status Table 13. ADSL Performance Status Screen Fields Field Meaning Down Alarms Identifies the current alarms in the path to the subscriber. Up Alarms Identifies the current alarms in the path from the subscriber. System State Describes the state of the ADSL system.
Configure and View Status 24 Hours ADSL Performance History. The 24 Hour ADSL Performance History report consists of eight screens. Each screen displays three hours of data, providing a 24-hour report in 15-minute increments. Type 2 on the ADSL menu to open the 24 Hour ADSL Performance History screen. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 08:45:54 01.
Configure and View Status 7 Days ADSL Performance History. The 7 Day ADSL Performance History menu displays the ES and UAS counts, and the minimum SNR margins for the previous 6 days and the current day. The division of the intervals is based on 12 am midnight as the dividing boundary, and the current day count is not necessarily equal to the total count for the past 24 hours. Type 3 on the ADSL Menu to open the 7 Day ADSL Performance History menu.
Configure and View Status ADSL Alarm History. The ADSL Alarm History screen consists of five columns. Table 14 describes the information found in each column. Type 4 on the ADSL Menu to open the ADSL Alarm History screen. 09/08/97 PAIRGAIN TECHNOLOGIES ATU-C ADSL MEGABIT MODEM TERMINAL 0 8 :4 7 : 5 4 01.
Configure and View Status Ethernet Bridge Statistics The Megabit Modem CRA-C provides real-time, non-disruptive monitoring of system performance. This menu displays a count of the valid Ethernet and ADSL frames received and forwarded by the 10BASE-T MDI-X and the line ports, respectively. The display is updated every 10 seconds and whenever you access this menu. Access the Statistics screen for the bridge by typing 3 on the Main Menu then typing 3 on the Bridge/Router Menu.
Configure and View Status Table 15. Bridge Statistics Fields Field Definition Ethernet Port Input Frames The number of frames correctly received. Output Frames The number of frames correctly transmitted. Discarded Frames The number of frames dropped due to an overflow of the input or output buffer for the port. Errored Frames The number of frames received in error (CRC, alignment, and dribbling bit) from the input buffer. ADSL Port Input Frames The number of frames correctly received.
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NETWORK AND MANAGEMENT OVERVIEW Through the console menus, you can configure the Megabit Modem CRA-C as a bridge to forward Ethernet data based on MAC addresses or as a router to route Ethernet data based on IP addresses. Additionally, you can configure parameters for management and encapsulation protocols using the Megabit Modem CRA-C console menus.
Network and Management Overview Figure 9.
Network and Management Overview You can enable or disable Spanning Tree on the Bridge/Router Configuration Menu. The Megabit Modem CRA-C uses the Spanning Tree defaults shown in Table 16. These values are user-configurable through SNMP as part of the Spanning Tree group in RFC 1493. Table 16.
Network and Management Overview Figure 10.
Network and Management Overview Figure 11 shows a more complex example of multiple gateways that use static IP routing to route packets sourced from specific users to different destination gateways. Figure 11.
Network and Management Overview When you configure the static IP routing feature, set the parameters defined in Table 17 through the Megabit Modem CRA-C console menus. Set the parameters defined in Table 18 in an external router (used as a gateway). Table 17. Megabit Modem CRA-C Static IP Routing Parameters 56 Parameter Definition Bridge/Router Mode Select router for the Megabit Modem CRA-C to route based on IP addresses.
Network and Management Overview Table 18. External Router Static Route Entry Parameter Definition Static Route Entry in External Routers Configure a Static Route entry in any of the external routers which may have been specified as a Default Router or as a Gateway.
Network and Management Overview Figure 12 shows an example of a point-to-point ADSL system and hypothetical values of parameters defined in Tables 17 and 18. Figure 12.
Network and Management Overview Megabit Modem CRA-C IP Addresses The Megabit Modem CRA-C has two IP addresses, one for the ADSL WAN port and one for the Ethernet port. In Figure 13, the non-shaded side of the provider and subscriber modems indicates the LAN address for the Ethernet (10BASE-T) connection. The shaded side of the provider and subscriber modems is the IP Line address for the ADSL line connection. Note that the IP Line address is unique from the LAN addresses.
Network and Management Overview Figure 13.
Network and Management Overview Management Protocols SNMP is used for configuring system and bridge parameters, monitoring statistics, and performing advanced management. SNMP This management protocol specifies how to send information between a Network Management System (NMS) and managed devices on a network. Managed devices (such as the Megabit Modem CRA-C) run a program called an agent. The agent interprets SNMP requests and responds to them.
Network and Management Overview Table 19. SNMP Configuration Default Values Attribute Factory Default Download Image File Name Not configurable via console Local IP Address 0.0.0.0 Local Subnet Mask 255.255.255.0 Boot Router IP Address 0.0.0.0 Default Router IP Address 0.0.0.0 Boot Server IP Address 0.0.0.0 Boot Mode (local, network) local Image Load Mode (local, network) local SNMP RO Community String public SNMP RW Community String private Trap Receiver 1 IP Address 0.0.0.
Network and Management Overview The Megabit Modem CRA-C provides an SNMP agent that supports several MIBs for the management of the system. The SNMP agent can process datagrams received from both the Ethernet interface (LAN) and the ADSL interface (Line).
Network and Management Overview The Spanning Tree MIB can only be accessed if the Spanning Tree protocol is enabled. PairGain REX MIB an enterprise specific MIB designed for the agent in the Megabit Modem CRA-C for managing the ADSL portion of the unit. The Ethernet interface has the ifIndex value of 1 and the WAN (ADSL) interface has an ifIndex of 2. Access any PairGain-specific MIBs through the Internet at ftp.pairgain.com. Use the following: • FTP ftp.pargain.
Network and Management Overview BOOTP conforms to the following RFCs: RFC 951: Bootstrap Protocol (BOOTP) RFC 1533: DHCP Options and BOOTP Vendor Extensions RFC 1542: Clarification and Extensions for the Bootstrap Protocol (updates 951) A BOOTP request is broadcast through the Ethernet port to the local network. The request is not sent from the ADSL port because the boot sector does not contain the code necessary to transmit over the WAN link.
Network and Management Overview TFTP Trivial File Transfer Protocol (TFTP) is used to download networking image code to the Megabit Modem CRA-C from a TFTP server. This allows software upgrades to be performed over the network.
TECHNICAL SPECIFICATIONS ADSL Line Signal Format CAP Line Code Transmit Signal Power up to 23 dBm Connector RJ-48 Ethernet Port Connector RJ-45, 10BASE-T Bandwidth Filtering 14 Kpps (64-byte packets, both directions) Forwarding Performance 2.7 Kpps Address Learning 2000 MAC addresses with aging Encapsulation Format Low-overhead HDLC or PPP Bridging IEEE 802.1d transparent with Spanning Tree Protocol Routing Static IP maps Physical Height 2.2 inches (5.6 cm) Width 7.5 inches (19.
Technical Specifications Management and Maintenance Embedded SNMP Agent BOOTP/TFTP download (with RFC 1542 extensions) RFC 1533 Dynamic Host Configuration Protocol RFC 1213 MIB II, RFC 1493 bridge MIB (base, ST, transparent groups) PairGain xDSL bridge MIB extensions RFC 1215 Traps (link state) and ST Traps (newRoot, topology Changed) ASCII Terminal Maintenance Port Type RS-232C, RJ-45 Data Rate Autobaud from 2400 to 19,200 baud Hardware Flow Control Not Supported Agency Certifications FCC B UL CE C
TECHNICAL ASSISTANCE PairGain Technical Assistance is available 24-hours-a-day, 7-days-a-week by contacting PairGain’s Customer Service Engineering group at one of the following numbers: Telephone: (800) 638-0031 (714) 832-9922 Fax: (714) 832-9924 During normal business hours (8:00 AM to 5:00 PM, Pacific Time, Monday Friday, excluding holidays), technical assistance calls are normally answered directly by a Customer Service Engineer.
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LIMITED WARRANTY PairGain Technologies, Incorporated warrants its products to be free of defective and faulty workmanship for a period of 60 months, under normal use, from the date of shipment. PairGain's obligation, under this warranty, is limited to replacing or repairing, at PairGain's option, any such product which is returned during the warranty period per PairGain's instructions and which product, in PairGain's sole option, is determined to be defective upon examination at our plant.
Limited Warranty 2 3 Provide the following information along with the equipment you're returning: • Your company name, address, and the name of the person whom we can contact in case we have any questions. • The same Purchase Order Number you gave us when you requested your RMA number. • A description of the equipment, as well as the number of units you're returning to us. Don't forget to include the model and part number of each unit.
GLOSSARY The Glossary defines technical terms and abbreviations used in this manual. Access Provider See Service Provider. Access Rate The transmission speed, in bits per second, of the physical access circuit between the end user and the network. ADSL Asymmetric Digital Subscriber Line. A method of transmitting at different downstream and upstream speeds. Alarm Any valid change of state from its normal condition detected at an alarm point.
Glossary CAP Carrierless Amplitude Phase Modulation. A twodimensional line code used in ADSL. Crosstalk Line noise that occurs due to coupling of signals between pairs in the same bundle. Downstream The direction of data reception from the Megabit Modem CRA-C to a remote unit. Ethernet A baseband LAN specification that has become a series of standards produced by IEEE referred to as IEEE 802.3. HDLC High-level Data Link Control.
Glossary Mbps Megabits per second. 1,000,000 bits per second. MDI Media Dependent Interface. MDI-X Media Dependent Interface (cross-over). MIB Management Information Base. NVRAM Non-Volatile Random Access Memory. Port An I/O interface. A point at which signals may be introduced or extracted in a similar manner. POTS Plain Old Telephone Service. PPP Point-to-Point Protocol. RAM Random Access Memory.
Glossary 76 Megabit Modem CRA-C User Manual
Corporate Office 14402 Franklin Avenue Tustin, CA 92780 Tel: (714) 832-9922 Fax: (714) 832-9924 For Technical Assistance: (800) 638-0031
