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150-431-115-01, Revision 01

Loopback Operation

HLU-431 List 1E

September 22, 1998

39

L

OOPBACK

O

PERATION

WITHOUT

D

OUBLERS

The complete family of loopbacks that a HiGain system can execute is shown in

. The loopbacks can be

initiated from the HLU RS-232 Craft port, the HLU front-panel MODE and SEL buttons, or from a family of
Special Loopback (SPLP) in-band loopback commands.

Figure 21.

HLU-431 Non-Doubler Loopback Configurations

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Summary of Contents for 150-1504-15

Page 1: ...SERVICES TECHNICAL PRACTICE 150 431 115 01 SECTION 150 431 115 01 Model List Number Part Number CLEI Code HLU 431 1E 150 1504 15 T1L2FVDAAA R S 2 3 2 L MARGIN STATUS BRG SPAN XMT RCV BRG SPAN dB HLU 431 H G LINE UNIT I AIN HDSL SETUP D S 1 SEL MODE PairGain ...

Page 2: ... 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 Other product names mentioned in this practice are used for identification purposes only and may be trademarks or registered trademarks of their respective companies Revision Release Date Re...

Page 3: ...sit immediately report the extent of damage to the transportation company and to PairGain Order replacement equipment if necessary Check the packing list to ensure complete and accurate shipment of each listed item If the shipment is short or irregular contact PairGain as described in the Warranty If you must store the equipment for a prolonged period store the equipment in its original container ...

Page 4: ...Inspecting Shipment 150 431 115 01 Revision 01 iv September 22 1998 HLU 431 List 1E ...

Page 5: ...________________ 9 Provisioning the HLU 431 _____________________________________________________________ 10 Setting Options through SEL and MODE 10 Factory Default Values 10 Displaying System Inventory 11 Connecting to a Maintenance Terminal 11 Maintenance ________________________________________________________________________ 13 Navigating the Maintenance Terminal Screens 13 System Spans 13 Nav...

Page 6: ... Day History Screen No Doubler 31 The 7 Day History Screen With Doubler 31 View Alarm History 32 Alarm History Screen No Doubler 33 Alarm History Screen With Doubler 34 Circuit ID 34 System Alarms_______________________________________________________________________ 35 Retiring System Alarms 35 Self Test 36 Loopback Operation__________________________________________________________________ 36 Sm...

Page 7: ...er Consumption without Doublers 50 Power Consumption Without Doublers 50 Maximum Power Dissipation 50 Maximum Power Consumption 50 Maximum Current Drain 50 Power Consumption With Doublers 51 Appendix D Compatibility ___________________________________________________________ 52 Mounting 52 HiGain Doubler Circuit Deployment 52 Appendix E Product Support _____________________________________________...

Page 8: ...reen 19 Figure 11 System Settings Screen 21 Figure 12 Loopback Menu No Doubler 26 Figure 13 Loopback Menu with Two Doublers 27 Figure 14 NLOC Loopback Mode in the Maintenance Terminal Main Menu 28 Figure 15 Performance Data Screen No Doublers 29 Figure 16 Span 3 Performance Data Screen 30 Figure 17 7 Day History Screen for Span 1 No Doubler 31 Figure 18 7 Day History Screen Span 3 32 Figure 19 Ala...

Page 9: ... Status Menu Messages Alarms 18 Table 9 HLU 431 List 1E System Settings Screen Options 24 Table 10 Errored and Unavailable Seconds Definitions 29 Table 11 Alarm History Fields and Descriptions 33 Table 12 HDSL System Alarms 35 Table 13 SPLB Loopback Command Set 41 Table 14 Addressable 1 2 5 A1LB A2LB A5LB Repeater Loopback Commands 44 Table 15 Addressable 3 and 4 A3LB and A4LB Repeater Loopback Co...

Page 10: ...List of Tables 150 431 115 01 Revision 01 x September 22 1998 HLU 431 List 1E ...

Page 11: ...ore TA TSY 001210 The HiGain system complies with GR 63 CORE TR TSY 000499 and GR1089 CORE NEW FEATURES Selectable DS 1 pre equalizer 140 to 200 Vdc HDSL line power for doubler and HRU 412 Front panel HDSL S N margin display Compatible with any 400 mechanic shelf Selectable loopback activation codes RS 232 maintenance port Shelf Management interface Non volatile front panel operator setup Front pa...

Page 12: ... for each bridged tap and 1 dB for each cable gauge change In general HiGain systems operate with any number of other T1 POTS Digital Data Service DDS or other HiGain systems sharing the same cable binder group can be used with customers requiring DS1 service on a temporary or permanent basis provide a means of quickly deploying service in advance of fiber optic transmission systems With a HiGain ...

Page 13: ... and HRU for a total of up to three spans PRODUCT DESCRIPTION The HLU 431 includes A front panel featuring A status display System option buttons Status LED DSX 1 access jacks RS 232 Craft port CLEI ECI bar code number Configuration number Card edge connector For compatibility guidelines on mixing newer doublers with older HRU and HLU models refer to HiGain Doubler Circuit Deployment on page 52 ...

Page 14: ...anel components are described in Table 2 on page 5 Figure 1 HLU 431 List 1E Front Panel dB MARGIN HLU431 HiGainLINEUNIT HDSL MODE SEL RCV BRG XMT L SPAN SPAN BRG DSX 1 R S 2 3 2 SETUP STATUS PairGain Front panel display System option buttons Receive and transmit jacks Craft port Barcode List number Warranty Control number Retaining latch Status LED ...

Page 15: ...llows the two T1 payloads to be monitored Craft RS 232 port Provides bidirectional communication between the unit and an external terminal to allow configuration and performance monitoring through the Maintenance Terminal screens CLEI ECI bar code label Provides the human readable Common Language Equipment Identifier CLEI code number and the Equipment Catalog Item ECI bar code number Configuration...

Page 16: ...l 1 The HLU and HRU transceivers are trying to establish contact with each other on loop 1 SIG2 Signal 2 The HLU and HRU transceivers are trying to establish contact with each other on loop 2 ACQ1 Acquisition 1 The HLU and HRU multiplexers are trying to establish synchronization over loop 1 ACQ2 Acquisition 2 The HLU and HRU multiplexers are trying to establish synchronization over loop 2 H1ES HDS...

Page 17: ...ring System Settings review mode defined above LOSW Loss of Sync Word Indicates that one of the HDSL loops has lost sync Causes a minor alarm LLOS Local Loss of Signal Indicates that no signal is detected at the DSX 1 input to the HLU Causes a minor alarm RLOS Remote Loss of Signal Indicates that no signal is detected at the DSX 1 input to the HRU Causes a minor alarm DS1 DS1 BPV Errors Indicates ...

Page 18: ...er management the MNGD message displays periodically on the HLU 431 front panel display Fuse Alarm Pin 25 on the card edge connector is a Fuse Alarm that is driven to 48V through a 1000Ω resistor whenever the onboard fuse opens Some HLU 431 features are affected when it is under management Consult the management unit practice for further information 27 25 23 21 19 17 15 13 11 9 7 3 5 1 ALARM MANAG...

Page 19: ...arms on page 35 for further information about system alarms INSTALLATION To install the HLU 431 1 Slide the HLU 431 into the card guides for the desired slot then push the unit back until it touches the backplane card edge connector and the retaining latch on the front panel opens Figure 3 Figure 3 Installing the HLU 431 into a Shelf 2 Place your thumbs on the HLU 431 front panel and push the HLU ...

Page 20: ...layed mode to the selected setting and then advances to the next configurable parameter After the last parameter has been selected a Confirm Yes No message appears on the front panel display 4 Do one of the following To cancel the session without saving the requested parameter changes press the MODE button Or do nothing After 30 seconds the display returns to its normal mode without saving the new...

Page 21: ... can access the maintenance provisioning and performance screens To connect to a maintenance terminal 1 Connect a standard 9 pin terminal cable to the RS 232 Craft port on the HLU 431 front panel 2 Connect the other end of the console cable to the console port on the maintenance terminal 3 If necessary start a terminal emulation program 4 Configure the maintenance terminal to the following communi...

Page 22: ...431 115 01 Revision 01 12 September 22 1998 HLU 431 List 1E Figure 4 DB 9 RS 232 I O Pinouts HRU 431 DB 9 Connector DCE RD Receive Data TD Transmit Data 2 3 5 DB 9 Connector DTE DB 25 Connector DTE TERMINAL TERMINAL 2 3 5 2 3 7 GND ...

Page 23: ... up to two doublers with three HDSL spans The Span Status Performance Data and Performance History may display as many as three screens to depict an HLU 431 system Figure 5 System Spans Navigation Keys Table 5 lists keys you can use on the maintenance terminal to navigate within the Maintenance Terminal screens Table 5 Navigational Keys on the Maintenance Terminal Key Function Updates a report Cle...

Page 24: ... or DS0 blocking INITIALIZING THE MAINTENANCE TERMINAL SCREENS Press the several times to initiate the autobaud connection and to initialize the Maintenance Terminal screens MAINTENANCE TERMINAL MAIN MENU Figure 6 shows the Maintenance Terminal Main Menu from which you can access eight system administration screens The function of each screen selection is listed in Table 6 Figure 6 Maintenance Ter...

Page 25: ...HDUs Figure 8 shows status between an HLU and its first doubler HDU1 If there is only one doubler the next screen Figure 9 shows status between HDU1 and the HRU If there are additional doublers the Span Status screen will report status on each span Table 6 Maintenance Terminal Screens Screen Function See page View Span Status Provides access to subscreens that allow you to monitor the HDSL line be...

Page 26: ...00013 00002 00001 second s DS1 STATUS HLU HRU 24 HOUR BPV Seconds 00000 00000 24 HOUR UAS Count 00000 00000 Frame type ESF ESF Code type B8ZS B8ZS E xit C lear U pdate S pa SPAN 1 STATUS TIME 12 06 04 DATE 02 02 98 ALARMS NONE LOOPBACK OFF HLU HDU1 HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 21 21 21 21 21 21 21 21 21 21 21 21 dB PULSE ATTN 19 19 20 19 dB INS...

Page 27: ...e system clock passes 12 00 AM midnight Pulse Attenuation ATTN Indicates the attenuation of the 2B1Q pulse from the distant end The value is related to the 196 kHz loss of the cable pair The pulse attenuation is a more direct indication of the loop attenuation to the 2B1Q signal than is the 196 kHz loss The normal HiGain ATTN operation range is from 0 to 28 dB Ins Loss Indicates the approximate in...

Page 28: ...rored Second Loop 2 CRC have exceeded the ES threshold DS1 Digital Service 1 BPVs for either the HLU 231 List 1E or HRU 412 DS1 input have exceeded the user selected ES threshold R L AIS Remote Local Alarm Indicating Signal Indicates an AIS all 1 pattern is being transmitted from the remote local T1 output port MAL1 Margin Alarm 1 The margin on HDSL loop 1 has dropped below the threshold 1 to 15 d...

Page 29: ...r Remote Loopback Loopback at HLU 231 List 1E remote towards customer initiated by IOR code or HLU front panel MANUAL LOOPBACK push buttons or maintenance terminal Figure 15 CDU 1 Customer Doubler 1 Loopback Loopback at Doubler 1 towards CI initiated by ILR code HLU 231 front panel MANUAL LOOPBACK push buttons or maintenance terminal Figure 15 CDU 2 Customer Doubler 2 Loopback Loopback at Doubler ...

Page 30: ...The remote unit date and time is set by using this option To update the remote do one of the following Press to update the HRU to the same date and time set for the HLU 431 or Press The remote unit is not updated All time information is lost when power is removed The last date however is retained in NVRAM and reappears when power is restored When editing entries in the Clock screen and when using ...

Page 31: ...ection The DS0 channels are blocked or unblocked by entering each channel number Multiple channels can be selected by inserting a space between each entry 3 After all the new settings have been made press for Exit then to Confirm The new choices are now installed If DS0 blocking is invoked in a HiGain system that has an earlier version HRU that does not support the blocking option blocking only oc...

Page 32: ...pt to either AMI or B8ZS should only be used in applications that require it such as when HiGain acts as a standby circuit to DS1 circuits whose line codes are not known or may be both AMI and B8ZS since it has the following two limitations The AUTO mode will induce one BPV in the DS1 bit stream whenever it switches from AMI to B8ZS The AUTO mode allows each HiGain end HLU and HRU to set its DS1 m...

Page 33: ...e feature of the HLU 431 List 1E is that its 200 V output voltage for doubler applications is always bipolar This bipolar voltage is required to support the Ground Fault Detection GFD circuit which is also unique to the HLU 431 List 1E The 140 V output voltage used in non doubler unit applications is always negative This keeps the HDSL cable pair voltage at or below ground potential thereby avoidi...

Page 34: ... the Teltrend addressable repeater A3LB Configures the HiGain system to respond to the in band loopback codes of the Wescom addressable repeater A4LB Configures the HiGain system to respond to the in band loopback codes of the Wescom Mod 1 addressable repeater A5LB Configures the HiGain system to respond to the in band loopback codes of the Teltrend Mod 1 addressable repeater Power PWRF DIS Disabl...

Page 35: ...time slot alignment While the HiGain system can also process unframed data in this AUTO mode it is recommended that the unframed UNFR mode be used for all unframed applications Using the AUTO mode for unframed applications runs the risk of detecting pseudo valid frame sequences which can affect the data integrity UNFR Configures the HiGain system to operate in an unframed mode This mode disables t...

Page 36: ...r Figure 12 shows the Loopback Menu when no doublers are present Figure 12 Loopback Menu No Doubler DSO Blocking DS0 BLK The DS0 blocking option can only be set via the RS 232 Craft port with a terminal The four Character Line Unit front panel only displays the status of the blocking option BLK indicates at least one channel is blocked NONE Indicates no channels are blocked Table 9 HLU 431 List 1E...

Page 37: ...ected loopback four letter designation now appears in the Loopback Mode field in the Maintenance Terminal Main Menu see Figure 14 in which an NLOC loopback is in progress The loopback continues to cycle in the system depending upon your Loopback Timeout setting The Loopback Menu screen is also available at the HRU connected to the HLU 431 thus allowing all HiGain System loopbacks to be initiated f...

Page 38: ...screens show the Errored ES and Unavailable Seconds UAS for both HDSL loops and each T1 input at 15 minute intervals over a 4 hour time interval Earlier and later data in 4 hour time periods on different span screens can be accessed by pressing Previous or Next respectively All Performance Data counters can be set to zero by pressing Clear from the HLU 431 Span Status screen shown below Since the ...

Page 39: ...RC has occurred HDSL Unavailable Second A second in which an HDSL loop has sync loss at least once DS1 Errored Second A second in which at least one BPV has occurred DS1 Unavailable Second A second in which at least one T1 LOS condition 175 75 zeros has occurred Date 02 02 98 PERFORMANCE DATA CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU 20 30 000 000 000...

Page 40: ...o by pressing Clear Since the HLU 431 is considered the master module this clears all performance data screens at both the HLU 431 and the HRU The RS 232 terminal interface at the HRU does not allow the counters to be cleared Date 02 02 98 SPAN 3 PERFORMANCE DATA CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HDU4 HRU HDU4 HRU 00 00 000 000 000 000 000 000 000 000 000 000...

Page 41: ...om the 7 Day History screen to advance through the history screens for the various spans Figure 18 is an example of a 7 Day History screen that lists history data for the third span Doubler 2 to the HRU Time 00 16 55 7 DAY HISTORY CIRCUIT ID SPAN 1 ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU 01 26 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0...

Page 42: ...ll data from the screen Press to exit from the Alarm History screen Time 03 09 34 7 DAY HISTORY CIRCUIT ID SPAN 5 ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HDU4 HRU HDU4 HRU 04 09 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 04 10 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 04 11 00000 00000 00000 00000 00000 00000 00000 00...

Page 43: ...SL2 First and last instance of LOSW on HDSL2 Current condition number of alarms Span 1 ES HDSL1 First and last instance of ES on HDSL1 Current condition number of alarms Span 1 ES HDSL2 First and last instance of ES on HDSL2 Current condition number of alarms Span 1 Margin L1 First and last instance of exceeded margin on Loop 1 Current condition number of alarms Span 1 Margin L2 First and last ins...

Page 44: ...screen that lists history for the third span Doubler 2 to the HRU Figure 20 Alarm History Screen for Span 3 CIRCUIT ID To set a Circuit ID 1 Press from the Maintenance Terminal Main Menu 2 Type a unique identifier for the circuit up to 24 characters then press If you type more than 24 characters a warning beep sounds and only the first 24 characters are accepted 3 Choose to confirm ALARM HISTORY T...

Page 45: ... inhibited ALRM LLOS Local Loss of Signal Loss of the DSX 1 input signal Cannot be inhibited ALRM RLOS Remote Loss of Signal Loss of the HRU DS1 input signal Disable the RDA Remote DS1 Alarm option This prevents an LOS condition at the DS1 input to a HRU from activating Pin H The front panel Status LED still flashes red and the ALRM RLOS message displays to alert you of the LOS state LOS is sent t...

Page 46: ...work In addition it allows in band codes to loop up the HLU CREM 6 in 7 or HRU CLOC 5 in 7 towards the customer Either loop up condition is terminated looped down with the 3 in 5 loop down code Both in band codes must be present for 5 seconds before the HiGain system responds See GNLB Loopback Test Procedures on page 41 for the test procedures that apply when using the GNLB mode The A1LB loopback ...

Page 47: ... is set to UNFR and the in band commands are set in either an SF or ESF mode The frame bits override the command bits and cause errors in the command sequence These errors cause the HiGain system to reject some sequences This can extend the detection interval INITIATING MANUAL LOOPBACK SESSIONS A manual loopback session allows you to select one of four HiGain system loopbacks To initiate a manual ...

Page 48: ...serting either HG HiGain or PL Payload adjacent to the identified loopback for example NREM HG LOOPBACK TEST PROCEDURES The following sections provide step by step test procedures for the HLU 431 as a function of the loopback option selected These procedures allow verification of the integrity of the HDSL channels at every module location as well as the DS1 channels to the customer and the local D...

Page 49: ...ERS The complete family of loopbacks that a HiGain system can execute is shown in Figure 21 The loopbacks can be initiated from the HLU RS 232 Craft port the HLU front panel MODE and SEL buttons or from a family of Special Loopback SPLP in band loopback commands Figure 21 HLU 431 Non Doubler Loopback Configurations ...

Page 50: ...ck Configurations DSX 1 CI DS 1 Loopbacks toward customer Loopbacks toward network HDSLSPAN HLU NLOC AIS AIS AIS AIS AIS AIS AIS AIS SMJK TLOS NREM CLOC HRU HRU HRU HRU HRU HDSLSPAN HDSLSPAN SPAN1 SPAN1 SPAN2 SPAN2 SPAN3 SPAN3 HDSLSPAN HDSLSPAN HDSLSPAN HLU HLU HLU CREM ELU ELU ELU ELU 2in5 3in7 4in7 6in7 6in7 4in6 5in6 2in6 3in6 LOGIC NDU1 CDU1 NDU2 CDU2 HDU HDU HDU HDU The Smart Jack loopback is...

Page 51: ...LOC HLU 431 loopback is in effect Loopback states are indicated by the green LOOP LED on the front panel and also display in the Span Status screen 5 Repeat Step 2 If the test passes the problem is in the downstream direction If it fails the problem is in the upstream direction Notes on Non doubler GNLB Loopback Test Procedures The HLU 431 can be looped up from the remote location CREM by issuing ...

Page 52: ...3D3 for at least 5 seconds The tester observes the following activation response in the order presented a 2 seconds of AIS all ones pattern b 2 seconds of returning data pattern c 231 logic errors including the frame bit occurring in the returned pattern comprising 10 errors if ILR 1 Doubler 1 was sent 200 errors if ILR 20 Doubler 2 was sent 20 errors if ILR 2 HRU was sent d normal looped data Thi...

Page 53: ...e automatic time out timer is restored during subsequent loopback sessions 5 Once the test is complete do one of the following If the system is to loopdown but remain ARMED send the IR Intelligent Repeater LPDN code universal loopdown If all the equipment is to be looped down disarmed and returned to normal operation send the disarm code 11100 Using the codes listed in Table 14 on page 44 a networ...

Page 54: ...nk Arming code 1111 F b 1111 F 0100 4 1000 8 b This is the HEX number for the 4 bit group IR LPDN or DISARM in band Disarming code 11100 11100 DISARM ESF Data Link Disarming code 1111 F 1111 F 0010 2 0100 4 IOR LPBK NLOC and CREM 229 231 bit errors c c The HRU identifies CREM with 231 bit errors including the frame bits When framed data is being sent in the AUTO framing mode the number of the 231 ...

Page 55: ...andom 10 3 Bit Error Ratio BER on the facility The entire arming and loopback sequence can be initiated at the remote HRU location HLU 431 LU FROM NI NLOC 1111 F b 1111 F 0001 1 1110 E b This is the HEX number for the 4 bit group HLU 431 LU from CI CREM 0011 3 1111 F 0001 1 1110 E HDU DOUBLER 1 FROM NI NDU1 1111 F 1111 F 0000 0 1000 4 HDU DOUBLER 1 FROM CI CDU1 0011 3 1111 F 0000 0 0100 4 HDU DOUB...

Page 56: ...cable DSX 1 Input Level 1 5 to 7 5 dBDSX DS1 Line Rate 1 544 Mbps 200 bps DS1 Line Format AMI B8ZS or ZBTSI DS1 Frame Format ESF SF or UNFR Maximum Power Consumption 18 Watts without Doubler 35 Watts with Doubler Maximum Heat Dissipation 8 Watts without Doubler 12 5 Watts with Doubler Fusing Internal connected to FUSE ALARM output on pin 32 HDSL Span Voltage 140 to 100 VDC Margin Indicator Display...

Page 57: ...t CRC Cyclic Redundancy Check CREM Customer Remote Loopback CSA Carrier Service Area CSU Channel Service Unit DCE Data Circuit Terminating Equipment DDS Digital Data Service DL Data Link DS1 Digital Signal Level 1 DSX 1 DS1 Cross connect Frame ES Errored Seconds ESF Extended SuperFrame ESF DL Extended SuperFrame Data Link HCDS High Capacity Digital Service HDSL High bit rate Digital Subscriber Lin...

Page 58: ...ace Unit NLOC Network Local Loopback NMA Network Management and Administration NREM Network Remote Loopback POTS Plain Old Telephone Service SAIS SmartJack AIS SF Super Frame SNR Signal to Noise Ratio SPLB Special Loopback STS Span Terminating Shelf TLOS LB Transmit Loss of Signal Loopback TSGR Transport System Generic Requirements UAS Unavailable Seconds UL Underwriters Laboratory ZBTSI Zero Byte...

Page 59: ...eives a 1 544 Mbps DSX 1 data stream from the DSX 1 digital cross connect interface The HLU 431 contains a DS1 frame synchronizer controlled by an 8 bit microprocessor that determines the type of framing on the DS1 stream and synchronizes to it The HLU 431 recognizes Super Frame SF including D4 or Extended Super Frame ESF framing When the data is unframed the HLU 431 arbitrarily defines a frame bi...

Page 60: ...emote enclosure The Maximum Current Drain is the maximum current drawn from the shelf power supply when it is at its minimum voltage 42 5 V It determines the shelf fusing requirements Heat baffles should be placed between every other shelf in racks containing more than two shelves This technique deflects the rack s heat outward and reduces thermal stress on the plugs Power Consumption Without Doub...

Page 61: ...lers This CO current and other related power parameters for this doubler application are listed in Table 16 The worst case loop conditions assumed for the three span line powering applications listed in Table 16 are a 2000 ohm total loop consisting of 9000 feet of 26 AWG for spans 1 and 2 and 6000 feet of 26 AWG for span 3 The thermal loading limitations imposed when using the HLU 431 List 1E in C...

Page 62: ...tion enhancements of newer doubler models require that all circuit modules be of the same vintage in order to realize these enhancements Enhanced doubler applications preclude the mixing of newer doubler models with older models of the HRU and HLU Table 17 on page 53 provides a matrix of HiGain doubler deployment rules to achieve maximum circuit enhancement It lists Maximum number of doublers allo...

Page 63: ...g requests or questions This system is available 24 hours a day by calling 714 730 2800 Transmission speeds up to 28 8 kbps are supported with a character format of 8 N 1 Table 17 HiGain Doubler Deployment Matrix Maximum Number of Doublers Per Circuit a HDU 451 List 3 3B 4 4B HDU 437 439 HDU 404 407 409 Line Powered Local Powered Line Powered Local Powered Line Powered Local Powered HLU Model CPEI...

Page 64: ...of the problem to PairGain Technologies Inc 14352 Franklin Avenue Tustin CA 92780 ATTN Repair and Return Dept 800 638 0031 PairGain continues to repair faulty modules beyond the warranty program at a nominal charge Contact your PairGain sales representative for details and pricing FCC COMPLIANCE This unit complies with the limits for Class A digital devices pursuant to Part 15 of the FCC rules The...

Page 65: ...low the provisions of the current edition of the National Electrical Code STANDARDS COMPLIANCE The HLU 431 List 1E has been tested and verified to comply with the applicable sections of the following standards GR 63 CORE Network Equipment Building System NEBS Requirements GR 089 CORE Electromagnetic Compatibility and Electrical Safety To comply with the intrabuilding wiring requirements of GR 1089...

Page 66: ...ECI bar code label Contains the serial number and part number of the unit as indicated in both bar code and text format Also contains the configuration number of the unit as indicated by CFG nn where nn is the configuration number For example CFG 07 indicates a revision number 7 Configuration number The configuration number is a two or three digit number that is either the last digits of a five or...

Page 67: ......

Page 68: ...Corporate Office 14402 Franklin Avenue Tustin CA 92780 Tel 714 832 9922 Fax 714 832 9924 For Technical Assistance 800 638 0031 ...

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