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Loopback Operation

150-231-175-01, Revision 01

September 23, 1998

HLU-231 List 7E

Figure 22.

Doubler Loopback Configurations

The more common generic, SPLB in-band loopback commands for doubler loopbacks are listed in

Table 13

. The

commands are very specific combinations of either 6 or 7 bits that continuously repeat. All NXXX loopbacks are
towards the network. All CXXX loopbacks are towards the customer.

Table 13.

SPLB Loopback Command Set

Loopback

Command

NDU1

1 1 0 0 0 0 (2-in-6)

NDU2

1 1 1 0 0 0 (3-in-6)

CDU1

1 1 1 1 0 0 (4-in-6)

CDU2

1 1 1 1 1 0 (5-in-6)

DSX-1

DS-1

Loopbacks

toward

customer

Loopbacks

toward

network

HDSL SPAN

HLU

NLOC

AIS**

AIS

SMJK*

TLOS

NREM

CLOC

HRU

HDSL SPAN

SPAN 1

SPAN 2

SPAN 3

HDSL SPAN

HLU

CREM

ELU

2 in 5

3 in 7

4 in 7

6 in 7

4 in 6

5 in 6

2 in 6

3 in 6

LOGIC

NDU1

CDU1

NDU2

CDU2

HDU

* The Smart-Jack loopback is a metallic loopback in the HRU's Lists 6 and 7.

It is a logic loopback in all lower HRU list numbers.

** The SAIS option must be set to ENA to cause the AIS pattern to be sent

to the CI during Smart-Jack Loopback.

Use the 3 in 5 code to loop down any of these loopbacks.

HLU

HRU

Содержание 150-1111-75

Страница 1: ...SERVICES TECHNICAL PRACTICE 150 231 175 01T SECTION 150 231 175 01 Model List Number Part Number CLEI Code HLU 231 7E 150 1111 75 T1L2KSXAAA R S 2 3 2 L MARGIN STATUS BRG SPAN XMT RCV BRG SPAN dB HLU...

Страница 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...

Страница 3: ...it 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 eac...

Страница 4: ...Inspecting Shipment 150 231 175 01 Revision 01 iv September 23 1998 HLU 231 List 7E...

Страница 5: ..._____________ 9 Provisioning the HLU 231 ______________________________________________________________ 9 Setting Options through SEL and MODE 10 Factory Default Values 10 Displaying System Inventory...

Страница 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_____...

Страница 7: ...ption 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 __________...

Страница 8: ...een 19 Figure 11 System Settings Screen 20 Figure 12 Loopback Menu No Doubler 26 Figure 13 Loopback Menu with Two Doublers 26 Figure 14 NLOC Loopback Mode in the Maintenance Terminal Main Menu 27 Figu...

Страница 9: ...LU 231 List 7E System Settings Screen Options 23 Table 10 Errored and Unavailable Seconds Definitions 28 Table 11 Alarm History Fields and Descriptions 33 Table 12 HDSL System Alarms 35 Table 13 SPLB...

Страница 10: ...List of Tables 150 231 175 01 Revision 01 x September 23 1998 HLU 231 List 7E...

Страница 11: ...mmended by Bellcore TA TSY 001210 The HiGain system complies with GR 63 CORE TR TSY 000499 and GR1089 CORE FEATURES Selectable DSX 1 Pre equalizer 140 V to 200 V self adjusting line voltage for HRU an...

Страница 12: ...basis The HiGain system also provides a means of quickly deploying service in advance of fiber optic transmission systems With the HiGain system service can be provided within hours Fiber optic syste...

Страница 13: ...ble when using the HDU 439 437 List 1 mini doublers and the HRU 412 List 8 remote unit in HDU 231 List 7E circuits For additional information on the mini doublers refer to technical practice 150 439 1...

Страница 14: ...75 01 Revision 01 4 September 23 1998 HLU 231 List 7E Front Panel The HLU 231 List 7E front panel is shown is Figure 1 The front panel components are described in Table 2 on page 5 Figure 1 HLU 231 Li...

Страница 15: ...HDSL span at the DSX 1 interface Breaks the XMT and RCV paths to permit test signal insertion and retrieval BRIDGE Provides non intrusive bridging jack access to XMT and from RCV the HDSL span at the...

Страница 16: ...condition by pressing the SEL button on the HLU front panel SELF TEST Self Test The HLU is in a self test mode This occurs every power ON OFF cycle ALRM Alarm Condition Exists A minor alarm condition...

Страница 17: ...Signal Indicates that no signal is detected at the T1 input to the HRU Causes a minor alarm DS1 DS1 BPV errors Indicates that the number of BPVs at the HLU or HRU DS1 inputs have exceeded the 24 hour...

Страница 18: ...larm Pin 32 on the card edge connector is a Fuse Alarm that is driven to 48V through a 1000 resistor whenever the onboard fuse opens System Alarm Relay Output The normally open alarm contacts availabl...

Страница 19: ...panel and push the HLU 231 into the card edge connector until it is entirely within the card guides and the retaining latch closes This indicates that the card is properly seated PROVISIONING THE HLU...

Страница 20: ...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 change...

Страница 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 231 front panel 2 Con...

Страница 22: ...ribe how the Maintenance Terminal displays an HLU 231 system with and without doublers how to navigate through the maintenance screens and how to select options System Spans As shown in Figure 5 the H...

Страница 23: ...identifies the name of a field where the invalid entry occurred error This happens only for Margin Alarm Threshold or DS0 blocking INITIALIZING THE MAINTENANCE TERMINAL SCREENS Press the several times...

Страница 24: ...ess to subscreens that allow you to issue and disable loopbacks at all circuit module locations 25 View Performance Data Provides access to subscreens that allow you to view the Errored Seconds ES and...

Страница 25: ...ations If doublers have been added status is also reported for these After pressing to access the Maintenance Terminal Main Menu press to navigate through the span status screens Span Status can have...

Страница 26: ...00000 00000 seconds 24 HOUR UAS 00000 00000 00000 00000 seconds 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...

Страница 27: ...ble 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 Indica...

Страница 28: ...oltage SMJK Smart Jack Loopback Loopback at HRU remote towards network initiated by 2 in 5 in band loopback code or out of band ESF data link code Figure 15 NREM Network Remote Loopback Loopback at HR...

Страница 29: ...ards CI initiated by ILR code HLU 231 front panel MANUAL LOOPBACK push buttons or maintenance terminal Figure 15 ARM Armed The HiGain system has detected the IR loopback 2 in 5 arming code TLOS Transm...

Страница 30: ...g of system setting options Press from the Maintenance Terminal Main Menu to open the System Settings screen Figure 11 Figure 11 System Settings Screen When editing entries in the Clock screen and whe...

Страница 31: ...0 channels with an all ones idle code The result of blocking the idle code is that the CRC checksum delivered to the remote end when the payload is in the BSF format will not match the checksum calcul...

Страница 32: ...t turn up when one conductor does open a system alarm occurs and causes the AIS LOS condition This alerts the maintenance personnel of the problem 2LP requires both HDSL loops to be out of sync LOSW b...

Страница 33: ...he Equalizer to DSX 1 for 133 to 266 feet 266 Sets the Equalizer to DSX 1 for 266 to 399 feet 399 Sets the Equalizer to DSX 1 for 399 to 533 feet 533 Sets the Equalizer to DSX 1 for 533 to 655 feet Sm...

Страница 34: ...rs its B8ZS mode It reverts back to its Alternate Mark Inversion AMI output mode if no B8ZS patterns are received at the HRU input for five seconds The HLUs T1 input can detect either AMI or B8ZS when...

Страница 35: ...smit the signal from the network towards the CI RCU port or to open and terminate its RCV CI port when an HRU NREM or SmartJack loopback is executed The AIS signal is not sent towards the CI Margin Al...

Страница 36: ...enu with Two Doublers LOOPBACK MENU TIME 00 15 34 DATE 02 02 98 CIRCUIT ID A DISABLE LOOPBACKS B NETWORK LOOP HLU NLOC C NETWORK LOOP HRU NREM G CUSTOMER LOOP HLU CREM H CUSTOMER LOOP HRU CLOC E xit L...

Страница 37: ...OC Loopback Mode in the Maintenance Terminal Main Menu Disable Loopbacks The Disable Loopbacks option allows you to disable cancel any of the loopbacks listed in the screen To disable loopbacks press...

Страница 38: ...erformance Data screen you can do the following Press to view the previous 4 hour data screen Press to view the next 4 hour data screen Press to exit Press to view the next available span Since the HL...

Страница 39: ...e Data screen to advance through the performance data screens for the various spans Figure 16 is an example of a Performance Data screen that lists performance data for the third span Doubler 2 to the...

Страница 40: ...UIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HDU4 HRU HDU4 HRU 00 00 000 000 000 000 000 000 000 000 000 000 000 000 00 15 000 000 000 000 000 000 000 000 000 000 000 000 00 30...

Страница 41: ...m 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 HR...

Страница 42: ...l data from the screen Press to exit from the Alarm History screen Time 03 09 34 7 DAY HISTORY CIRCUIT ID SPAN 3 ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HDU4 HRU HDU4 HRU 04 09 0...

Страница 43: ...L2 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...

Страница 44: ...creen 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 uniqu...

Страница 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 Thi...

Страница 46: ...ACK CODE GNLB The HiGain generic loopback code is GNLB The GNLB allows in band codes to loop up either the HLU NLOC 4 in 7 or HRU NREM 3 in 7 towards the network In addition it allows in band codes to...

Страница 47: ...the arming code from exiting the Line Unit it does not need this FAR END ACTIVATE code A3LB differs from A4LB in that A3LB supports the additional 1 in 6 SMJK loopback command A HiGain system may tak...

Страница 48: ...back is active the method by which it was activated is indicated in the Loopback and Status screens by inserting either HG HiGain or PL Payload adjacent to the identified loopback for example NREM HG...

Страница 49: ...ns or from a family of Special Loopback SPLP in band loopback commands Figure 21 HLU 231 Non Doubler Loopback Configurations LOOPBACK OPERATION WITH DOUBLERS The complete family of loopbacks that a Hi...

Страница 50: ...1 0 0 4 in 6 CDU2 1 1 1 1 1 0 5 in 6 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 HDSLSPA...

Страница 51: ...y issuing the 6 in 7 command at the HRU DS1 input port The HRU can be looped up from the remote location CLOC by issuing the 5 in 7 command at the HRU DS1 input port Notes on Doubler GNLB Loopback Tes...

Страница 52: ...determine the duration of this loopback unless it is overridden by the Time out Override command or a loop down command is sent If the Time out Override code 1101 0101 1101 0110 D5D6 is received the...

Страница 53: ...14 on page 44 a network tester can activate loopbacks NLOC or NREM or SMJK if enabled A customer tester can activate loopbacks CLOC or CREM All loopbacks shown in Table 14 can also be initiated from...

Страница 54: ...k 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 0...

Страница 55: ...ndom 10 3 Bit Error Ratio BER on the facility The entire arming and loopback sequence can be initiated at the remote HRU location HLU 231 LU FROM NI NLOC 1111 F b 1111 F 0001 1 1110 E b This is the HE...

Страница 56: ...ble 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 wi...

Страница 57: ...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 Si...

Страница 58: ...ce 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...

Страница 59: ...HLU 231 receives a 1 544 Mbps DSX 1 data stream from the DSX 1 digital cross connect interface The HLU 231 contains a DS1 frame synchronizer controlled by an 8 bit microprocessor that determines the t...

Страница 60: ...maximum bay dissipation is limited to 946 Watts At 7 Watts per slot this limits the number of occupied slots to 135 per bay The thermal loading limitations imposed when using the HLU 231 in a Controll...

Страница 61: ...ution Fuse Bus BDFB when deploying the HiGain system equipment in COs The maximum HLU 231 List 7E power dissipation is the power that is converted into heat within the unit It contributes to the total...

Страница 62: ...Current CO Voltage Volts CO Current Amps List 1 2 CO Current Amps List 3 4 M M Power Consumption Watts List 1 2 Power Consumption Watts List 3 4 M M HLU Power Dissipation Watts List 1 2 HLU Power Diss...

Страница 63: ...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 18 on...

Страница 64: ...EI ON CPEI OFF HLU 231 List 6D HLU 232 List 1D 1 1 2 2 1 1 2 2 1 2 2 2 HLU 319 List 2X HLU 388 List 2X 1 1 2 2 1 1 2 2 1 2 2 2 HLU 231 List 7X HLU 431 List 1D and 1E 1 1 2 2 1 2 b 2 2 1 2 2 2 HLU 231...

Страница 65: ...730 2800 Transmission speeds up to 28 8 kbps are supported with a character format of 8 N 1 WARRANTY PairGain Technologies warrants this product to be free of defects and to be fully functional for a...

Страница 66: ...the appropriate instruction manual for the unit you are installing to get information on Cabling Correct connections Grounding MODIFICATIONS The FCC requires the user to be notified that any changes o...

Страница 67: ...Barcode 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...

Страница 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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