Paradyne M/HDSL Standalone Termination Unit Hotwiret 7986 User's Manual
Contents
1. Table 11 lists Switchpack S2 definitions Table 11 Switchpack S2 Definitions Switch Allows you to Default in Bold 1 Control whether the unit is an LTU or an NTU OFF NTU ON LTU Control enabling and disabling of the AutoRate capability Only valid for units configured as LTU OFF AutoRate Disabled ON AutoRate Enabled Select one of eight preset DSL line rates refer to Table 12 All OFF 2064 Not used Emergency Use Only The 7986 has two banks of flash memory used to hold executable firmware This switch allows you to switch between the two versions of firmware This switch is independent from the position of Switch 1 on Switchpack S1 switchpack enable disable OFF Current Firmware ON Previous Firmware Use Table 12 to set the DSL Line Rate Defaults are shown in bold Table 12 DSL Line Rate Switches 3 5 on Switchpack S2 Switch Position 5 4 3 DSL Line Rate OFF ON ON 400 kbps ON OFF OFF 528 kbps ON OFF ON 784 kbps ON ON_ OFF 1040 kbps ON JON ON 1552 kbps OFF OFF OFF 2064 kbps 7986 A2 GZ40 00 March 1999 19 A Important Safety Instructions 20 1 Read and follow all warning notices and instructions marked on the product or included in the manual Input power to this product must be provided by one of the following 1 a UL Listed CSA Certified power source with2. GZ40 00 Connecting to the Network B gt Procedure To connect your unit to the network 1 Connect one end of the supplied network cable into the rear panel DSL jack 2 Connect the other end to your DSL network interface NOTE Do not use a flat VF network cable as this may severely degrade the performance of the termination unit Use only Cat 5 twisted pair network cable A crossover cable Pins 1 and 2 to 4 and 5 is required to connect two 7986 Standalone Termination Units back to back Connecting to a DTE The E1 network interface is either two BNC connectors Transmit and Receive for a 75 ohm unbalanced interface or an RJ48C 8 position unkeyed modular connector for a 120 ohm balanced interface See Cables and Pin Assignments in the User s Guide for specifications of the 120 ohm connector and cable Connecting to a System Terminal An optional system maintenance terminal may be attached to your Hotwire 7986 Standalone Termination Unit through the modular jack on the rear panel The system maintenance terminal allows you to view the status of the unit and change configuration options The terminal must be a VT100 compatible terminal or a PC running terminal emulation software B gt Procedure To connect your unit to a system terminal 1 Connect the 9 pin end of the terminal cable into a COM port on your PC 2 Plug the other end into the modular jack on the rear panel 3 Set the communication parameters on your PC or t
3. a Class 2 or Limited Power Source LPS output for use in North America or 2 a 24 Vdc National Electric Code NEC ANSI NFPA 70 Canadian Electric Code CEC Class 2 circuit installed in accordance with articles 110 16 110 17 and 110 18 of the NEC and articles 2 308 2 310 2 312 2 314 2 200 and 2 202 of the CEC or 3 a Safety Extra Low Voltage SELV power source with a maximum available output of less than 240 VA certified for use in the country of installation Slots and openings in the cabinet are provided for ventilation To ensure reliable operation of the product and to protect it from overheating these slots and openings must not be blocked or covered Do not allow anything to rest on the power cord and do not locate the product where persons will walk on the power cord Do not attempt to install or service this product yourself as opening or removing covers may expose you to dangerous high voltage points or other risks Refer all installation and servicing to qualified service personnel General purpose cables are provided with this product Special cables which may be required by the regulatory inspection authority for the installation site are the responsibility of the customer When installed in the final configuration the product must comply with the applicable Safety Standards and regulatory requirements of the country in which it is installed If necessary consult with the appropriate regulator
4. and secure the cover 7 Power up the board to reset and enable the new configuration 16 March 1999 7986 A2 GZ40 00 Switchpack Locations Use the following illustration to locate Switchpacks S1 and S2 Switchpack S1 amp S2 Q Front Co lt 8LigGreEeet 8LigGgreet Rear 98 16073 Hotwire 7986 Standalone Termination Unit Switchpack Locations 7986 A2 GZ40 00 March 1999 17 Switchpack Definitions 18 Manually change configuration options by moving Switchpack S1 DIP switches on the card Table 10 lists Switchpack S1 definitions Table 10 Switchpack S1 Definitions Switch Allows you to Default in Bold Enable or disable Switchpacks S1 and S2 OFF Switchpacks Disabled ON Switchpacks Enabled Control line termination OFF 120 Ohm ON 75 Ohm Select the unit s primary timing source Only valid for units configured as LTU OFF Internal Clock ON External Clock Control the unit s E1 line coding OFF HDB3 ON AMI Not used Enable CRC 4 monitoring OFF Enable CRC 4 ON Disable CRC 4 monitoring Control whether Channel 16 contains signaling information or data OFF Channel 16 is used for signaling ON Channel 16 is used for data Not used March 1999 7986 A2 GZ40 00
5. identify each SNMP trap manager Access Level Possible Settings Read Read Write Default Setting Read Determines the access level allowed for an authorized NMS when IP address validation is being performed March 1999 7986 A2 GZ40 00 7986 A2 GZ40 00 Table 9 SNMP Traps Options SNMP Traps Possible Settings Enable Disable Default Setting Disable Controls the generation of SNMP trap messages The options for addresses and types of traps are located in this table Number of Trap Managers Possible Settings 1 2 3 4 5 Default Setting 1 Sets the number of SNMP management systems that will receive SNMP traps NMS n IP Address Possible Settings 000 000 000 000 223 255 255 255 Clear Default Setting 000 000 000 000 Specifies the Internet Protocol address used to identify each SNMP trap manager NMS n Destination Possible Settings DSL COM Default Setting DSL Provides the network destination path of each trap manager General Traps Possible Settings Disable Warm AuthFail Both Default Setting Both Determines which SNMP traps are sent to each trap manager Enterprise Specific Traps Possible Settings Enable Disable Default Setting Disable Determines if SNMP traps are generated for enterprise specific events Link Traps Possible Settings Disable Up Down Both Default Setting Both Determines
6. 0 Specifies the unit s Communication Port IP Address when the unit is configured as a network communication link Communication Port IP Address is only used when the Port Use option on the Communication Port Options menu is set to Net Link If the COM Port IP address is not set 000 000 000 000 the node IP address specified by the Node IP Port will be used Communication Port Subnet Mask Possible Settings 000 000 000 000 255 255 255 255 Default Setting 000 000 000 000 Specifies the units Communication Port Subnet Mask when the unit is configured as a network communication link Communication Port Subnet Mask is only used when the Port Use option on the Communication Port Options menu is set to Net Link If the COM Port IP address is not set 000 000 000 000 the node IP Address will be used Communication Port Link Protocol Possible Settings PPP SLIP Default Setting PPP Specifies the units Communication Port link layer protocol when the unit is configured as a network communication link Communication Port Link Protocol is only used when the Port Use option on the Communication Port Options menu is set to Net Link March 1999 7986 A2 GZ40 00 7986 A2 GZ40 00 Table 7 General SNMP Management Options SNMP Management Possible Settings Enable Disable Default Setting Disable Enable or disables the SNMP management features Community Name 1 Possible Settin
7. 86 G 703 98 16151 4 March 1999 7986 A2 GZ40 00 In a DSLAM to standalone configuration m The devices synchronize without altering factory defaults since the CO unit defaults to LTU mode and the CP unit defaults to NTU mode In a standalone to standalone configuration One unit must be changed to run in LTU mode since standalone units have a factory default setting of NTU mode In both cases the clocking source may have to be altered depending on network requirements Choosing a Configuration Mode You can make configuration changes either through a VT100 compatible terminal and the unit s Configuration menus or by manually changing switches on the board The unit comes configured to allow settings to be made through the Configuration menus Configuring the Unit Using the Configuration Menus Use the Configuration menu to select display or change configuration option settings NOTE The 7986 Standalone Termination Unit is preconfigured as an NTU If you are using this unit as an NTU the configuration options may not need to be changed The 7986 Standalone Termination Unit has two sets of configuration option settings The Current Configuration the 7986 Standalone Termination Unit s active set of configuration options The Default Factory Configuration a read only configuration area containing the factory default configuration options To display configuration options you must first load a configur
8. PARADYNE Hotwire 7986 M HDSL Standalone Termination Unit with G 703 Interface Installation Instructions Document Number 7986 A2 GZ40 00 March 1999 Product Documentation on the World Wide Web We provide complete product documentation online This lets you search the documentation for specific topics and print only what you need reducing the waste of surplus printing It also helps us maintain competitive prices for our products Complete documentation for this product is available at www paradyne com Select Library gt Technical Manuals gt Hotwire DSL amp MVL Systems Select the following document 7986 A2 GB20 Hotwire 7986 M HDSL Standalone Termination Unit with G 703 Interface User s Guide To request a paper copy of a Paradyne document Within the U S A call 1 800 PARADYNE 1 800 727 2396 Outside the U S A call 1 727 530 8623 Installation Overview 7986 A2 GZ40 00 Installation and configuration of the Hotwire 7986 Standalone Termination Unit consists of Connecting power to the unit Connecting to the network Connecting to a DTE Connecting a system terminal Providing initial unit identity information or changing existing identity information m Configuring your unit using internal switchpacks or using the Configuration Edit menus Before you install the Hotwire 7986 Standalone Termination Unit read the Important Safety Instructions on page 20 Be sure to register your warranty at w
9. arranty Registration Telephone Call our automated system to receive current information by fax or to speak with a company representative Within the U S A call 1 800 870 2221 Outside the U S A call 1 727 530 2340 March 1999 21 Asynchronous Terminal Interface Menu The following illustration shows the menu paths to the different terminal screens Status Test Systemand Performance Display Identity Change Download Reset TestStatus Statistics LEDs Identity Code AutoRate Administer Apply Reset Logins Download Device Network Network G 703 Error Performance Statistics Statistics Statistics Network Device Abort Factory Configuration u l and Tests All Config Loader Edit Display G 703 Test Tests Network G 703 System Communication Management Options Port and Communication Telnet Communication General SNMP SNMP Session Protocol SNMP NMS Traps 99 16071 01 Document Feedback We welcome your comments and suggestions about this document Please mail them to Technical Publications Paradyne Corporation 8545 126th Ave N Largo FL 33773 or send e mail to userdoc paradyne com Include the number and title of this document in your correspondence Please include your name and phone number if you are willing to provide additional clarification 7986 A2 GZ40 00 Copyright 1999 Paradyne Corporation 22 March 1999 7986 A2 GZ40 00
10. ation into the edit area To load a configuration option set into the configuration edit area follow this menu selection sequence Main Menu gt Configuration Load Configuration From Make a selection by placing the cursor at your choice and pressing Enter If you select Then Current The selected configuration option set is loaded and the Configuration Configuration Edit Display menu screen appears Default Factory The selected configuration option set is loaded and the Configuration Configuration Edit Display menu screen appears Configuration The Configuration Loader screen is displayed allowing you to Loader upload or download configurations from a TFTP server 7986 A2 GZ40 00 March 1999 5 Configuration Edit Display The Configuration Edit Display screen is displayed when the current customer or default configuration is loaded To access the Configuration Edit Display screen follow this menu selection sequence Main Menu gt Configuration Current Configuration Main Menu gt Configuration Default Factory Configuration main config edit Hotwire Model 7986 CONFIGURATION EDIT DISPLAY Network G 703 System Options Communication Port Management and Communication Ctrl a to access these functions ESC for previous menu MainMenu Exit Save Select To Access the To Configure the Network Network Interface Options Table 1 DSL network interfaces on
11. cally ending G 703 Line Termination Possible Settings 120 Ohm 75 Ohm Default Setting 120 Ohm Determines whether the line impedance is set for 75 Ohm or 120 Ohm Table 4 Communication Port Options 1 of 2 Port Use Possible Settings Terminal Net Link Default Setting Terminal Specifies how the communications port is to be used Port Type Possible Settings Asynchronous Synchronous Default Setting Asynchronous When Port Use is set to Net Link Port Type controls whether the communication port will be asynchronous or synchronous Data Rate Possible Settings 9 6 14 4 19 2 28 8 38 4 Default Setting 9 6 Specifies the communication port baud rate Character Length Terminal Use Only Possible Settings 7 8 Default Setting 8 Determines the character length of the communication port March 1999 10 Table 4 Communication Port Options 2 of 2 Parity Terminal Use Only Possible Settings None Odd Even Default Setting None Specifies the parity of the communication port Stop Bits Terminal Use Only Possible Settings 1 1 5 2 Default Setting 1 Specifies the number of stop bits for the communication port Ignore Control Leads Terminal Use Only Possible Settings Disable DTR Default Setting Disable Specifies whether DTR is used Login Required Terminal Use Only Possibl
12. e Settings Enable Disable Default Setting Disable Specifies if an ID and password are required to access the asynchronous terminal interface on the communication port Login IDs are created with a password and access level Port Access Level Terminal Use Only Possible Settings Administrator Operator Default Setting Administrator Specifies the highest level of access allowed when accessing an ATI session through a Telnet session Inactivity Timeout Terminal Use Only Possible Settings Enable Disable Default Setting Disable Provides automatic logoff of a Telnet session Disconnect Time Minutes Terminal Use Only Possible Settings 1 60 Default Setting 5 Number of minutes of inactivity before the session terminates automatically Timeout is based on no keyboard activity March 1999 7986 A2 GZ40 00 7986 A2 GZ40 00 Table 5 Telnet Session Options Telnet Session Possible Settings Enable Disable Default Setting Enable Specifies if the Termination Unit will respond to a Telnet session request from a Telnet client on an interconnected IP network Telnet Login Required Possible Settings Enable Disable Default Setting Disable Specifies whether a user ID and password are required to access to the ATI through a Telnet session Login IDs are created with a password and access level Session Access Level Possible Settings Admini
13. e unit is configured as an LTU DSL Line Rate Possible Settings 400 528 784 1040 1552 2064 Default Setting 2064 Determines the fixed line rate of the LTU in kbps DSL Line Rate is only available when the unit is configured as an LTU and AutoRate is set to Disable Peer IP Address LTU Only Possible Settings 000 000 000 001 223 255 255 255 Clear Default Setting 000 000 000 000 Specifies the peer IP address for the NTU to provide remote management providing the remote management link on the DSL loop Peer IP Address is only available when the standalone unit is configured as an LTU Circuit Identifier Possible Settings ASCII Text Clear Default Setting blank Uniquely identifies the circuit number of the transmission vendor s DSL line for troubleshooting purposes March 1999 Table 2 G 703 Interface Options Port Status Possible Settings Enable Disable Default Setting Enable Determines whether the port can be configured and used Framing Possible Settings Framed Unframed Default Setting Framed Determines whether G 704 framing is used for the G 703 interface Line Coding Format Possible Settings AMI HDB3 Default Setting HDB3 Specifies the line coding format to be used by the G 703 interface Line Framing Possible Settings CRC4 noCRC4 Default Setting noCRC4 Specifies the framing format t
14. erminal to 9600 baud 8 bit characters no parity 1 stop bit no flow control Press Enter from your terminal or PC to activate the Main Menu for the attached unit The system runs diagnostics and status checks After a few moments the Main Menu or Logon screen appears on your terminal 7986 A2 GZ40 00 March 1999 3 Entering Identity Information After accessing your unit for the first time use the Change Identity screen to determine SNMP administrative system information that will be displayed on the Identity screen of the Status branch To access the Identity screen follow this menu selection sequence Main Menu gt Control gt Change Identity Network Configuration The following illustration shows a network application using a 2 port Hotwire 8786 or 8784 M HDSL Termination Unit for access concentration in a central office CO A frame relay switch and a router are connected through the termination unit to partner units supporting a host or router and frame relay encapsulated or unframed data i i l E1 Host 1 lt CO Site _ Frame Relay i Encapsulated Data Frame Relay Switch re Frame Relay Encapsulated po N EIA 530A 8786 or 8784 Termination Unit in 8600 DSLAM Customer Premises CP Customer CO Site Premises LTU NTU 7986 G 703 7985 V 35 7986 G 703 79
15. gs ASCII text field Public Default Text Public Identifies the name of the community allowed to access the unit s MIB The community name must be supplied by an external SNMP manager when that manager attempts to access an object in the MIB Name 1 Access Possible Settings Read Read Write Default Setting Read Determines the access level for Community Name 1 Community Name 2 Possible Settings ASCII text field Public Default Text Public Identifies the name of the second community allowed to access the unit s MIB The community name must be supplied by an external SNMP manager when that manager attempts to access an object in the MIB Name 2 Access Possible Settings Read Read Write Default Setting Read Determines the access level for Community Name 2 March 1999 13 14 Table 8 SNMP NMS Security Options NMS IP Validation Possible Settings Enable Disable Default Setting Disable Specifies whether security checking is performed on the IP address of SNMP management systems attempting to access the node Number of Managers Possible Settings 1 2 3 4 5 6 7 8 9 10 Default Setting 1 Specifies the number of SNMP management systems that can send SNMP messages NMS n IP Address Possible Settings 000 000 000 000 223 255 255 255 Clear Default Setting 000 000 000 000 Specifies the Internet Protocol address used to
16. if SNMP traps are generated for link up and link down for one of the communication interfaces Link Trap Interfaces Possible Settings Network G 703 All Default Setting All Determines if the SNMP inkUp SNMP inkDown and interface related enterpriseSpecific traps are generated for the network interface G 703 interface or both March 1999 15 Configuring the Unit Using the Internal Switches If desired use internal Switchpacks S1 and S2 to manually configure the unit A HANDLING PRECAUTIONS FOR STATIC SENSITIVE DEVICES This product is designed to protect sensitive components from damage due to electrostatic discharge ESD during normal operation When performing installation procedures however take proper static control precautions to prevent damage to equipment If you are not sure of the proper static control precautions contact your nearest sales or service representative B gt Procedure To configure the unit using internal Switchpacks S1 and S2 1 Power down the unit and disconnect the power supply 2 Remove the enclosure cover Insert a small flat screwdriver blade into the slots on one side of the cover and push to free the inner latches Lift off the cover to expose the circuit board 3 Locate Switchpack S1 4 Set Switch 1 on Switchpack S1 to ON to enable Switchpacks 1 and 2 5 After you enable the switchpacks set the switches to your desired configuration 6 Replace
17. o be used by the G 703 interface Time Slot 16 Possible Settings Signaling Data Default Setting Signaling Specifies whether the G 703 interface is used for voice or data Send AIS on Network Failure Possible Settings Enable Disable Default Setting Enable Specifies the action taken on the signal transmitted to the G 703 when a valid signal cannot be recovered from the network interface LOS or cognitions OOF AIS or EER Primary Clock Source Possible Settings G 703 Internal Default Setting Internal Specifies where the unit will derive its timing from Secondary Clock Source Possible Settings G 703 Internal Default Setting Internal Specifies where the unit will derive its timing from if the primary clock fails March 1999 7986 A2 GZ40 00 7986 A2 GZ40 00 Table 3 System Options DSL Mode Possible Settings LTU NTU Default Setting NTU Controls whether the unit is configured as a control unit or tributary unit NOTE Changing this option will reset the unit Test Timeout Possible Settings Enable Disable Default Setting Enable Allows tests to end automatically The feature should be enabled when the unit is remotely managed so that control can be regained after a test is accidentally executed Test Duration min Possible Settings 1 120 Default Setting 10 Number of minutes for a test to be active before automati
18. pment 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 the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense The authority to operate this equipment is conditioned by the requirements that no modifications will be made to the equipment unless the changes or modifications are expressly approved by Paradyne Corporation A WARNING To Users of Digital Apparatus in Canada This Class A digital apparatus meets all requirements of the Canadian interference causing equipment regulations Cet appareil num rique de la classe A respecte toutes les exigences du r glement sur le mat rial brouilleur du Canada Warranty Sales Service and Training Information Contact your local sales representative service representative or distributor directly for any help needed For additional information concerning warranty sales service repair installation documentation training distributor locations or Paradyne worldwide office locations use one of the following methods 7986 A2 GZ40 00 Internet Visit the Paradyne World Wide Web site at www paradyne com Be sure to register your warranty there Select Service amp Support gt W
19. strator Operator Default Setting Administrator The Telnet session access level is interrelated with the access level of the Login ID Inactivity Timeout Possible Settings Enable Disable Default Setting Disable Provides automatic logoff of a Telnet session Disconnect Time Minutes Possible Settings 1 60 Default Setting 5 Number of minutes of user inactivity before a Telnet session terminates automatically Time out is based on no keyboard activity March 1999 11 12 Table 6 Communication Protocol Options Node IP Address Possible Settings 000 000 000 000 223 255 255 255 Default Setting 000 000 000 000 Specifies the Node IP address Node IP Address is only available when the standalone unit is configured as an LTU Node Subnet Mask Possible Settings 000 000 000 000 255 255 255 255 Default Setting 000 000 000 000 Specifies the Node Subnet Mask Node Subnet Mask is only available when the standalone unit is configured as an LTU Default Network Destination Possible Settings None COM DSL Default Setting None Specifies where the default management network is connected For example if your default network is connected to the COM port select COM as the default management network destination Communication Port IP Address Possible Settings 000 000 000 000 223 255 255 255 Default Setting 000 000 000 00
20. the unit G 703 G 703 Interface Options Table 2 G 703 interface System Options System Options Table 3 eta system options of e unit Communication Communication Port Options Table 4 Unit s COM port options Port Management Telnet Session Options Table 5 Management support of the and eae unit through SNMP and Communication Communication Protocol Options Telnet Table 6 General SNMP Management Options Table 7 SNMP NMS Security Options Table 8 SNMP Traps Options Table 9 6 March 1999 7986 A2 GZ40 00 7986 A2 GZ40 00 Table 1 Network Interface Options Margin Threshold Possible Settings 5db 4db 3db 2db 1db Odb 1db 2db 3db 4db 5db 6db 7db 8db 9db 10db Default Setting Odb Determines the level expressed in decibels at which a signal to noise margin alarm condition is reported Excessive Error Rate Threshold Possible Settings 1E 4 1E 5 1E 6 1E 7 1E 8 1E 9 Default Setting 1E 6 Determines the error rate at which an excessive error rate EER condition is recognized The rate is the ratio of the number of CRC errors to the number of bits received in a certain period AutoRate Possible Settings Enable Disable Default Setting Disable Determines whether the unit automatically adjusts to the best line rate for conditions or is fixed at the rate in the DSL Line Rate field AutoRate is only available when th
21. ww paradyne com Select Service amp Support gt Warranty Registration March 1999 Connecting Power to the Unit If your package includes a power pack Plug the power pack into an ac outlet having a nominal voltage rating between 100 240 Vac Connect the output cable of the power pack to the connector marked POWER on the rear panel If your package includes a direct connection 24 Vdc power cable Connect the unit to an external 24 Vdc SELV Safety Extra Low Voltage power source as described in Connecting the Unit to an Optional External 24 Vdc Power Source If you will use a 48 Vdc power supply Connect the unit to an external 48 Vdc SELV power source as described in the documentation shipped with the power supply and power cable Connecting the Unit to an Optional External 24 Vdc Power Source Using the dc power cable the Hotwire 7986 Standalone Termination Unit is capable of operating on a 24 Vdc SELV power supply B gt Procedure To use the dc power cable 1 24 Vdc Power Supply Pinouts Connect the white wire to the return Black Red Green White Orange Blue March 1999 X X Ground RTN 24 Vdc X Connect the green wire to a suitable ground 2 Connect the orange wire to the 24 Vdc source 3 4 Cut the black red and blue wires off at the outer insulation 5 Plug the power connector into the 7986 Standalone Termination Unit 99 14158 02 7986 A2
22. y agencies and inspection authorities to ensure compliance Arare phenomenon can create a voltage potential between the earth grounds of two or more buildings If products installed in separate buildings are interconnected the voltage potential may cause a hazardous condition Consult a qualified electrical consultant to determine whether or not this phenomenon exists and if necessary implement corrective action prior to interconnecting the products In addition if the equipment is to be used with telecommunications circuits take the following precautions Never install telephone wiring during a lightning storm Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface Use caution when installing or modifying telephone lines Avoid using a telephone other than a cordless type during an electrical storm There may be a remote risk of electric shock from lightning Do not use the telephone to report a gas leak in the vicinity of the leak March 1999 7986 A2 GZ40 00 EMI Warnings A WARNING This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equi
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