Cabletron Systems WPIM T1 User Manual Download

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Chapter 3: Local Management for T1 Service

3-2

WPIM-T1/DDS User’s Guide

3.1

THE WAN PHYSICAL CONFIGURATION SCREEN

To access the WAN Physical Configuration screen, use the arrow keys to
highlight the WAN SETUP menu item, then press ENTER. The screen
shown in

Figure 3-1

displays.

Figure 3-1

WAN Physical Configuration Screen

NOTE

When there is more than one WPIM installed into the host
platform, information for the second WPIM will display next to
WPIM 1.

SAVE

WAN INT CONFIG

RETURN

Type: T1
WPIM #: 1
Mgr Type: [PPP]
Max VCs: 024
Next IF: 003

WAN PHYSICAL CONFIGURATION

T1 Timeslot View:
T1 Line Coding:
T1 Frame Type:
T1 Tx Clock Source:
T1 Line Buildout:
T1 Loopback:

WPIM 1 Timeslot Configuration

000 000 000 000

000

000 000 000

01-08

09-16

17-24

WPIM 1 Line Configuration

000 000 000 000

000

000 000 000

000 000 000 000

000

000 000 000

275002

<host name> Local Management

Flash Image Version: xx.xx.xx

[WPIM 1]

WPIM 1

[Active]
[B8ZS]
[ESF]
[Loop-Timing]
[0 db]
[None]

REMOTE SETUP

Summary of Contents for WPIM T1

Page 1: ...WPIM T1 DDS T1 DDS Title Page WPIM T1 DDS User s Guide 9032750 ...

Page 2: ......

Page 3: ...n this manual may be trademarks or registered trademarks of their respective companies 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 NOTE This equipment has been tested...

Page 4: ...service in some situations Repairs to certified equipment should be coordinated by a representative designated by the supplier Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the ...

Page 5: ...reement shall be interpreted and governed under the laws and in the state and federal courts of New Hampshire You accept the personal jurisdiction and venue of the New Hampshire courts EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY 1 EXCLUSION OF WARRANTY Except as may be specifically provided by Cabletron in writing Cabletron makes no warranty expressed or implied concerning the Program includ...

Page 6: ...nd c in all respects is proprietary data belonging to Cabletron and or its suppliers For Department of Defense units the product is licensed with Restricted Rights as defined in the DoD Supplement to the Federal Acquisition Regulations Section 52 227 7013 c 1 ii and its successors and use duplication disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii of the...

Page 7: ...5022 EN 50082 1 EN 60950 Equipment Type Environment Networking Equipment for use in a Commercial or Light Industrial Environment We the undersigned hereby declare under our sole responsibility that the equipment packaged with this notice conforms to the above directives Manufacturer Legal Representative in Europe Mr Ronald Fotino Mr J Solari ___________________________________ ____________________...

Page 8: ...Notice vi WPIM T1 DDS User s Guide ...

Page 9: ... 2 1 4 Post Installation 2 3 2 2 LEDs 2 4 2 3 Required Operations 2 4 2 3 1 Choosing T1 or DDS Mode 2 4 2 3 2 WAN Configuration 2 5 2 4 Connecting the WAN cable to the WPIM T1 DDS 2 6 CHAPTER 3 LOCAL MANAGEMENT FOR T1 SERVICE 3 1 The WAN Physical Configuration Screen 3 2 3 1 1 WAN Physical Configuration Screen Fields 3 3 3 1 2 WPIM Line Configuration Fields 3 4 3 1 3 The WPIM Timeslot Configuratio...

Page 10: ... 4 1 1 WAN Physical Configuration Screen Fields 4 2 4 1 2 WPIM Line Configuration Fields 4 4 4 2 WAN Interface Configuration Screen 4 5 4 2 1 WAN Interface Configuration Screen Fields 4 5 4 2 1 1 Frame Relay as the Protocol Manager 4 6 4 2 1 2 PPP as the Protocol Manager 4 7 4 2 1 3 Command and Interface Table Fields 4 8 4 3 DDS Service Configuration 4 9 4 3 1 DDS Service Physical Configuration 4 ...

Page 11: ... USING THIS MANUAL Read through this manual completely to familiarize yourself with its content and to gain an understanding of the features and capabilities of the WPIM T1 DDS You should have a general working knowledge of the following data communications networks and their physical layer components before using the WPIM T1 DDS WAN Ethernet and IEEE 802 3 STRUCTURE OF THIS GUIDE The following li...

Page 12: ... in this manual This manual references procedures in these manuals where appropriate but does not repeat them The following manuals may help the user to set up and manage the WPIM T1 DDS Cabletron Systems HSIM W6 Installation Guide Cabletron Systems HSIM W84 Installation Guide Cabletron Systems QuickSET Configuration Guide for CSX200 CSX400 CSX400 DC HSIM W6 and HSIM W84 Cabletron Systems CyberSWI...

Page 13: ...enote either a user input or a highlighted screen selection RETURN Indicates either the ENTER or RETURN key depending on your keyboard ESC Indicates the keyboard Escape key SPACE bar Indicates the keyboard space bar key BACKSPACE Indicates the keyboard backspace key arrow keys Refers to the four keyboard arrow keys Indicates the keyboard key DEL Indicates the keyboard delete key italic type Emphas...

Page 14: ...is a recurring problem etc Any previous Return Material Authorization RMA numbers n Indicates the generic use of a number e g 19nn indicates a four digit number in which the last two digits are unknown In the Local Management screens the brackets indicate that a value may be entered or selected In the format descriptions in the Network Tools section required arguments are enclosed in In the format...

Page 15: ... Management User s Guide for instructions on setting up and accessing Local Management Select the service desired T1 or DDS using Network Tools Once the desired service has been chosen refer to the appropriate chapter in this document for setup information Due to the automation of setup features it is strongly recommended to use the Graphical User Interface QuickSET to fully configure the device Q...

Page 16: ...de the WPIM T1 DDS provides a T1 interface that includes a built in Channel Service Unit Digital Service Unit CSU DSU for direct connection to a T1 line In the DDS service mode the WPIM T1 DDS extends the functionality of the Wide Area Network module to allow remote connectivity using Digital Data Service DDS It provides a DDS interface that includes a built in Channel Service Unit Digital Service...

Page 17: ...l PPP and as defined by RFC 1661 Frame Relay as defined by RFC 1490 ISDN as defined by Q 921 and Q 931 1 4 MIB SUPPORT Refer to the Release Notes included with the host platform for a list of all MIBs supported by the WPIM T1 DDS For information about how to extract and compile individual MIBs contact Cabletron Systems refer to Getting Help NOTE A connection can only be chosen for either T1 or DDS...

Page 18: ...Chapter 1 Overview 1 4 WPIM T1 DDS User s Guide ...

Page 19: ...ately Refer to Getting Help Only qualified personnel should install the WPIM T1 DDS This User s Guide is intended for the experienced network equipment installer NOTE QuickSET or Local Management must be used to set up the WPIM T1 DDS in management before any connections are made to the WAN Follow the directions carefully NOTE Some WPIMs require version 1 02 or greater of QuickSET to participate a...

Page 20: ...IM T1 DDS 2 1 3 Installing the WPIM T1 DDS To install the WPIM T1 DDS into the device refer to Figure 2 1 and complete the following steps 1 Remove the blank faceplate from the appropriate WAN slot by removing the three WPIM screws that secure it to the standoffs 2 Orient the WPIM T1 DDS as shown in Figure 2 1 3 Carefully insert the WPIM T1 DDS connector into the WPIM connector pins on the device ...

Page 21: ...ct the WAN cable until instructed to do so 3 Refer to instructions contained in the host platform user s guide to reapply power 4 After reapplying power check the LEDs for the following conditions Verify that the PWR LED is on indicating that the device is receiving power After the host platform runs a self test the CPU LED blinks green indicating normal operation If the CPU LED remains red contac...

Page 22: ...form manual 2 3 REQUIRED OPERATIONS The WPIM T1 DDS must be configured before connecting to the WAN The configuration must be performed in the following order Choose T1 or DDS mode Section 2 3 1 WAN configuration using QuickSET or Local Management Section 2 3 2 2 3 1 Choosing T1 or DDS Mode The mode T1 or DDS must be chosen before either QuickSET or Local Management is used to configure the WAN se...

Page 23: ...ot 1 use the following command to allow the WPIM T1 DDS in slot 1 to perform T1 service t1dds 1 2 To perform DDS service use the following command also for slot 1 t1dds 1 1 3 Press the ENTER key The unit automatically reboots and the user must re enter Local Management 2 3 2 WAN Configuration The WPIM T1 DDS must be configured for WAN operation using either QuickSET or Local Management before the ...

Page 24: ... but may be ordered separately from Cabletron Systems cable part number 9372094 for T1 and part number 9360119 for DDS service Refer to Appendix A for details Figure 2 3 WAN Connection to the WPIM T1 DDS CAUTION DO NOT plug the WAN cable into the external WAN connection until you have properly completed the WAN setup in software If this cable is plugged in prematurely before the host unit is confi...

Page 25: ...sing PPP Section 3 4 Frame Relay Configuration Section 3 5 Read Section 3 1 and Section 3 2 to gain an understanding of the WPIM T1 DDS Local Management screens for T1 Section 3 3 through Section 3 5 provide examples for setting up the WPIM T1 DDS for full or fractional T1 in a PPP environment or for configuring the WPIM T1 DDS for Frame Relay in the T1 mode TIP Navigate through the WPIM Local Man...

Page 26: ...he host platform information for the second WPIM will display next to WPIM 1 SAVE WAN INT CONFIG RETURN Type T1 WPIM 1 Mgr Type PPP Max VCs 024 Next IF 003 WAN PHYSICAL CONFIGURATION T1 Timeslot View T1 Line Coding T1 Frame Type T1 Tx Clock Source T1 Line Buildout T1 Loopback WPIM 1 Timeslot Configuration 000 000 000 000 000 000 000 000 01 08 09 16 17 24 WPIM 1 Line Configuration 000 000 000 000 0...

Page 27: ...information for each WPIM WPIM 1 2 Read Only Displays configuration information for up to two different WPIMs Type Read Only Displays the type of WPIM installed For the WPIM T1 DDS the Type field displays the service selected When T1 service is selected T1 is displayed When DDS service is selected DDS is displayed WPIM Read Only Displays the number of the slot in which the WPIM resides Mgr Type Se...

Page 28: ...ure 3 1 are specific to the T1 mode of the WPIM T1 DDS T1 Timeslot View Toggle Displays the status of the Timeslot Configuration Table This field toggles between Active and New The field comes up with the default setting Active The Active setting displays current Timeslot Configuration table settings The New setting allows you to change Timeslot Configuration table settings The default setting for...

Page 29: ...oop and Payload Loop In Line Loop the entire T1 line is looped back including the framing bits CRC and the facility data link This happens before the framer In Payload Loop only the 24 time slots are looped back which happens behind the framer and does not include the framing bits CRC and facility data link The WPIM T1 DDS must be in Loop Timing mode to use this option The default setting is None ...

Page 30: ...4 Timeslots Site 1 uses 16 to communicate with Site 2 and the remaining 8 to communicate with Site 3 This configuration varies tremendously depending on how the service provider maps out the T1 Timeslots The service provider indicates which Timeslots are active Figure 3 3 Sample Configuration SITE 1 SITE 2 Telco Cloud 24 Timeslots 16 Timeslots SITE 3 8 Timeslots 1482_02 SITE 2 01 08 09 16 17 24 SI...

Page 31: ...on screen then press ENTER The WAN Interface Configuration screen shown in Figure 3 4 displays Figure 3 4 WAN Interface Configuration Screen NOTE The Interface numbers of Site 1 Site 2 and Site 3 do not have to match Only the quantity and position of Timeslots must match the service provider assigns the Timeslots WAN INTERFACE CONFIGURATION RETURN SAVE Interface Number 000 Max Xmit Unit 0 ProtMgr ...

Page 32: ...Section 3 2 1 1 for information on the Active Protocol set to Frame Relay and Section 3 2 1 2 for PPP information 3 2 1 1 Frame Relay as the Protocol Manager Refer to Figure 3 4 for the following parameters displayed for FR FR LMI Selectable Frame Relay Link Management Interface This field displays ANSI_94 NO LMI T1 617 D or Q 933 A The NO LMI setting is for specialized applications in which no Fr...

Page 33: ...parameters displayed for PPP PPP MRU Modifiable Displays the Maximum Receive Units that PPP can handle modifiable by the user ECP Enable Toggle Toggles between On and Off to enable or disable encryption ECP Status Read Only Displays the status of encryption WAN INTERFACE CONFIGURATION RETURN SAVE Interface Number 003 Max Xmit Unit 1526 ProtMgrIface 0 Active Protocol PPP PPP MRU 1520 ECP Enable Off...

Page 34: ...of the application ports available from the host platform If the active protocol is PPP or FR PtoP only one application port per interface number IF is assigned If the active protocol is FR PtoMP the available WAN ports from the host platform may be assigned one per DLCI IF Read Only Displays the MIB II Interface number that is associated with the application port CKT LID Read Only Displays the Li...

Page 35: ...th a WPIM T1 DDS installed at Site 1 Configurations may vary depending on the host platform Figure 3 6 Full T1 Configuration The line configuration information shown in Table 3 1 must be supplied by the service provider Table 3 1 Telco Configuration Information Configuration Information Required by User Configuration Information Supplied by Service Provider Line Coding B8ZS or AMI Frame Type ESF o...

Page 36: ...he arrow keys to highlight the next timeslot field Exit this field by using the arrow keys The cursor automatically moves to the T1 Line Coding field The following four steps are based on information supplied by the service provider Consult the service provider for the correct settings 5 Use the arrow keys to highlight T1 Line Coding Press the SPACE bar to select B8ZS or AMI then press ENTER 6 Use...

Page 37: ...ny further configuration 11 Proceed to Section 3 3 2 to continue configuration 3 3 2 T1 Interface Configuration The WAN Interface Configuration screen is accessed through the WAN Physical Configuration screen Access the WAN Interface Configuration screen by using the arrow keys to highlight the WAN INT CONFIG command and press ENTER Refer to Figure 3 4 and proceed with the following steps to confi...

Page 38: ...des step by step instructions for configuring the WPIM T1 DDS to use a fractional T1 circuit in a PPP environment This example assumes the setup shown in Figure 3 7 using two CSX400s with each containing a WPIM T1 DDS Configurations may vary depending on the host platform In a fractional T1 setup only a portion of the 24 Timeslots or DS 0s are used Figure 3 7 Fractional T1 Configuration NOTE The t...

Page 39: ...ENTER The cursor moves to Timeslot 1 of the Timeslot Configuration Table 4 Insert an interface number refer to Note below into every Timeslot being used in the example shown back in Figure 3 7 16 Timeslots are used the rest have zeros in them Type the number press ENTER then use the arrow keys to highlight the next Timeslot field Exit this field by using the arrow keys The cursor automatically mov...

Page 40: ...etting then press ENTER 9 Use the arrow keys to highlight T1 Network Loopback Press the SPACE bar to select None then press ENTER 10 Use the arrow keys to highlight the SAVE command then press ENTER The message Save Done appears and Local Management saves the changes to memory The host platform reboots and re entry to Local Management is necessary for any further configuration 11 Proceed to the Se...

Page 41: ...it the WPIM T1 DDS automatically sets the Max Xmit Unit to 1526 default after the active protocol PPP is selected 3 Make any changes to the available settings as desired 4 Use the arrow keys to highlight the SAVE command then press ENTER The message Save Done appears and Local Management saves the changes to memory The WAN configuration is complete It takes up to 60 seconds for the WAN Interface t...

Page 42: ...d Point to Multipoint PtoMP Frame Relay Point to Point has one Interface per DLCI assigned when DLCIs are created by the Service Provider In Frame Relay Point to Multipoint there is one interface to multiple DLCIs and the DLCIs are dynamically learned Backup can only be run on FR PtoP not FR PtoMP 2 Use the arrow keys to highlight Timeslot View Press the SPACE bar to select New then press ENTER Th...

Page 43: ...light T1 Tx Clock Source Press the SPACE bar to select Local no clock source provided by telephone company or Loop Timing clock source provided by telephone company then press ENTER 7 Use the arrow keys to highlight T1 Line Buildout LBO Press the SPACE bar to select to 0 dB unless the service provider recommends another setting then press ENTER 8 Use the arrow keys to highlight the SAVE command th...

Page 44: ... to the available settings as desired 4 Use the arrow keys to highlight SAVE then press ENTER The message SAVE DONE displays and Local Management saves the changes to memory In FR PtoP the DLCIs must be entered statically as they will not come up dynamically as in FR PtoMP In FR PtoMP there is an option to statically enter the DLCIs in association with a Protocol Manager the physical port and MIB ...

Page 45: ...provider s switch takes approximately one or two minutes to complete A status of Inactive displays on a DLCI per DLCI basis by default until both ends of the DLCI are configured correctly Once both end devices have negotiated link management with the switches and are configured correctly on a DLCI per DLCI basis the status field displays Active ...

Page 46: ...Chapter 3 Local Management for T1 Service 3 22 WPIM T1 DDS User s Guide ...

Page 47: ...ent Sections of this chapter include the following The WAN Physical Configuration Screen Section 4 1 The WAN Interface Configuration Screen Section 4 2 WPIM DDS Configuration Section 4 3 Read Section 4 1 and Section 4 2 to gain an understanding of the WPIM T1 DDS Local Management screens Section 4 3 provides examples for setting up the WPIM DDS in a PPP or Frame Relay environment NOTE The WPIM T1 ...

Page 48: ...ds and provide instructions for setting them The WAN Physical Configuration screen lets you configure the WPIM or Physical Interface NOTE When there is more than one WPIM installed into the host platform information for the second WPIM will display next to WPIM 1 The Type field displays either T1 or DDS depending on the mode selected using Network Tools SAVE WAN INT CONFIG RETURN Type DDS WPIM 1 M...

Page 49: ... selected T1 is displayed When DDS service is selected DDS is displayed WPIM Read Only Displays the number of the slot in which the WPIM resides Mgr Type Selectable The type of protocol manager is chosen in this field For the DDS mode of the WPIM T1 DDS the available options are NONE PPP FR PtoMP FR PtoP and HDLC The field defaults to NONE Max VCs Modifiable Displays the maximum number of virtual ...

Page 50: ...Clock Source Toggle Displays the clock source as either Loop Timing or Local Timing The Loop Timing setting allows the WPIM T1 DDS to receive its timing information from the service provider and the Local Timing setting allows the WPIM T1 DDS to receive its timing information internally If DDS CC is chosen for the DDS Line Mode then this field must be set to Loop The default setting is Loop DDS Lo...

Page 51: ... Number Use this field to configure the Interface Number assigned to the timeslots on the WAN Physical Configuration screen Max Xmit Unit Modifiable User configured field that displays the maximum packet size that can be transmitted on the selected interface The default settings for this field 1526 for PPP and 4095 for Frame Relay depend on the Protocol Manager selected WAN INTERFACE CONFIGURATION...

Page 52: ...A The NO LMI setting is for specialized applications in which no Frame Relay Link Management is available or required DLCI Address Modifiable Data Link Connection Identifier given by the Service Provider The Telco switch assigns a virtual port to each DLCI Can be set to values from 0 1023 depending on the protocol when available for modification with certain protocol modes The values 0 15 and 1008...

Page 53: ...n and Off to enable or disable compression CCP Status Read Only Displays the status of compression Comp Ratio Read Only Displays the Compression Ratio which is the ratio of uncompressed to compressed data WAN INTERFACE CONFIGURATION RETURN SAVE Interface Number 003 Max Xmit Unit 1526 ProtMgrIface 0 Active Protocol PPP PPP MRU 1520 ECP Enable Off ECP Status Off CCP Enable Off CCP Status Off Comp Ra...

Page 54: ...port per interface number IF is assigned If the active protocol is FR PtoMP the available WAN ports from the host platform may be assigned one per DLCI IF Read Only Displays the MIB II Interface number that is associated with the application port CKT LID Read Only Displays the Link Identifier If the active protocol is Frame Relay the Data Link Connection Identifier is displayed If the active proto...

Page 55: ...ation screen Figure 4 1 through Local Management To access the WAN Physical Configuration screen use the arrow keys to highlight the WAN Setup option then press ENTER The screen shown in Figure 4 1 displays Proceed with the following steps 1 Use the arrow keys to highlight the WPIM X field at the bottom of the screen Press the SPACE bar to select the number of the WPIM being configured then press ...

Page 56: ...he changes to memory REBOOT IN PROGRESS displays and the host platform reboots Re entry to management is necessary for any further configuration 4 3 2 DDS Service Interface Configuration The WAN Interface Configuration screen is accessed through the WAN Physical Configuration screen Access the WAN Interface Configuration screen Figure 4 2 by using the arrow keys to highlight the WAN INT CONFIG com...

Page 57: ...Manager instead of Frame Relay the Max Xmit Unit setting may be changed from the default of 1526 if desired 4 Make any changes to the available settings as desired 5 Use the arrow keys to highlight the SAVE command Press ENTER The message Save Done appears and Local Management saves the changes to memory The WAN configuration is complete Communication between the WPIM T1 DDS and the service provid...

Page 58: ...Chapter 4 Local Management for DDS Service 4 12 WPIM T1 DDS User s Guide ...

Page 59: ... the following safety and electromagnetic compatibility EMC requirements Dimensions 1 94 H x 6 2 W x 15 06 D cm 762 H x 2 44 W x 5 93 D in Weight 113 6 g 4 ounces MTBF Predicted 200 000 hours Operating Temperature 5 C to 40 C 41 F to 104 F Storage Temperature 30 C to 90 C 22 F to F Relative Humidity 5 to 95 non condensing Safety UL 1950 CSA C22 2 No 950 EN 60950 IEC 950 and 73 23 EEC Electromagnet...

Page 60: ...e length of cable when ordering A 4 1 Cable Assemblies and Pinouts The following section provides connector information for the T1 interface cable Table A 1 Cabletron T1 Cable Part Numbers Interface Cable Cabletron Part Number T1 Line Interface Cable 9372094 201 1 Standard 20 foot T1 Line Interface Cable 9372094 L2 2 L denotes length required in feet or meters For example 9372094 3 denotes a 3 foo...

Page 61: ...mit Tip 6 Not Used 7 Shield Ground 8 Shield Ground Table A 4 T1 RJ48 DTE Pin Assignments Pin Signal 1 Receive Ring 2 Receive Tip 3 Not Used 4 Transmit Ring 5 Transmit Tip 6 Not Used 7 Shield Ground 8 Shield Ground Table A 5 T1 RJ48 Network Pin Assignments Pin Signal 1 Receive Ring 2 Receive Tip 3 Not Used 4 Transmit Ring 5 Transmit Tip 6 Not Used 7 Not Used 8 Not Used ...

Page 62: ...ce DDS circuit The pinout information for the DDS mode of the port is shown in Table A 6 below Table A 7 lists the Cabletron Systems part number for the DDS mode interface cable Table A 6 DDS Mode Network Pinout Assignments PIN SIGNAL 1 Transmit Ring 2 Transmit Tip 3 Not Used 4 Not Used 5 Not Used 6 Not Used 7 Receive Tip 8 Receive Ring Table A 7 DDS Mode Interface Cable Part Number Interface Cabl...

Page 63: ...ugs and jacks 2 Before connecting your unit you must inform the telephone company of the following information 3 If the unit appears to be malfunctioning it should be disconnected from the telephone lines until you learn if your equipment or the telephone line is the source of the trouble If your equipment needs repair it should not be reconnected until it is repaired 4 If the telephone company fi...

Page 64: ...nity for uninterrupted service You will be advised of your right to file a complaint with the FCC 7 The attached affidavit must be completed by the installer 8 In the event of equipment malfunction all repairs should be performed by our Company or an authorized agent It is the responsibility of the users requiring service to report the need for service to our Company or to one of our authorized ag...

Page 65: ...pment to be connected complies with Part 68 of the Commission s rules except for the encoded analog content and billing protection specifications With respect to encoded analog content and billing protection I attest that all operations associated with the establishment maintenance and adjustment of the digital CPE with respect to encoded analog content and encoded billing information continuously...

Page 66: ...horized representative using training materials and instructions provided by the manufacturer grantee of the equipment used to encode analog signals or c An independent training course e g trade school or technical institution recognized by the manufacturer grantee of the equipment used to encode analog signals or d In lieu of the proceeding training requirements the operator s maintainer s is are...

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