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Loopback Operation

150-388-125-01, Revision 01

September 15, 1998

HLU-388 List 2E

OOPBACK

PERATION

ITH

OUBLERS

The complete family of loopbacks that a HiGain system equipped with the HDU-409, HDU-417 or HDU-404 can
execute is shown in

Figure 22

. 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 22.

Doubler Loopback Configurations

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

Summary of Contents for HiGain Line Unit HLU-388

Page 1: ...OLOGIES INC ENGINEERING SERVICES TECHNICAL PRACTICE 150 388 125 01v SECTION 150 388 125 01 Model List Number Part Number CLEI Code HLU 388 2E 150 1141 25 T1L2BBYAAA MODE SEL M A R G I N dB SETUP STATU...

Page 2: ...ined 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 pr...

Page 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...

Page 4: ...Inspecting Shipment 150 388 125 01 Revision 01 iv September 15 1998 HLU 388 List 2E...

Page 5: ...__________________________ 8 Provisioning__________________________________________________________________________ 9 Setting Options Through SEL and MODE 9 Factory Default Values 9 Displaying System...

Page 6: ...Screen No Doubler 33 Alarm History Screen With Doubler 34 Circuit ID Option 34 System Alarms_______________________________________________________________________ 35 Retiring System Alarms 36 Self Te...

Page 7: ...Dissipation 52 Maximum Power Consumption 52 Maximum Current Drain 52 Power Consumption With Doublers 53 Appendix D Compatibility ___________________________________________________________ 54 T1 Repe...

Page 8: ...Table of Contents 150 388 125 01 Revision 01 viii September 15 1998 HLU 388 List 2E...

Page 9: ...ck Menu 19 11 System Settings Menu 20 12 Loopback Menu No Doubler 26 13 Loopback Menu One Doubler 26 14 NLOC Loopback Mode in the Maintenance Terminal Main Menu 27 15 Performance Data Screen No Double...

Page 10: ...inal Screens 14 7 Span Status Fields and Descriptions 17 8 HLU 388 Status Menu Messages 18 9 HLU 388 System Settings Menu Options 23 10 Errored and Unavailable Seconds Definitions 28 11 Alarm History...

Page 11: ...00063 Network Equipment Building System NEBS Generic Equipment Requirements and TR TSY 000499 Transport System Generic Requirements TSGR Common Requirements FEATURES Selectable DS1 pre equalizer 130 t...

Page 12: ...f 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...

Page 13: ...LEI ECI bar code number Configuration number A card edge connector FRONT PANEL The HLU 388 List 2E front panel is shown is Figure 1 The front panel components are described in Table 2 on page 4 Figure...

Page 14: ...opbacks and to display DSX 1 line parameters and line unit identity Status LED See Table 3 for status descriptions Craft RS 232 port Bantam 210 jack provides bidirectional communication between the un...

Page 15: ...plexers of the HLU and HRU or first doubler are trying to establish synchronization over loops 1 or 2 of span 1 H1ES HDSL CRC Error Channel 1 HLU HDSL Loop 1 CRC error H2ES HDSL CRC Error Channel 2 HL...

Page 16: ...s NONE indicates no channels are blocked BLK indicates some channels are blocked DS1 DS1 BPV Errors Indicates that the number of BPVs at the HLU or HRU T1 inputs have exceeded the 24 hour ES threshold...

Page 17: ...GD message displays periodically on the HLU 388 front panel display Fuse Alarm Pin 117 on the card edge connector is a Fuse Alarm that is driven to 48V whenever the onboard fuse opens It emulates the...

Page 18: ...d the retaining latch on the front panel opens Figure 3 Figure 3 Installing the HLU 388 into a Shelf 2 Place your thumbs on the HLU 388 front panel and push the HLU 388 into the card edge connector un...

Page 19: ...cted setting and then advances to the next configurable parameter After the last parameter has been selected the following message appears on the front panel display CONF NO 4 Do one of the following...

Page 20: ...A 210 to DB 9 adapter is provided with every unit to facilitate the use of standard RS 232 DB 9 cables See Figure 4 Once connected to a maintenance terminal you can access the maintenance provisionin...

Page 21: ...rovisioning HLU 388 List 2E September 15 1998 11 Figure 4 DB 9 RS 232 I O Pinouts HLU 388 Female DB 9 Connector DCE RD Receive Data TD Transmit Data 2 3 5 DB 9 Connector DTE DB 25 Connector DTE TERMIN...

Page 22: ...three HDSL spans The Span Status Performance Data and Performance History may display as many as four screens to depict an HLU 388 system Figure 5 System Spans Navigation Keys Table 5 lists keys you...

Page 23: ...DSO 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...

Page 24: ...e 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...

Page 25: ...000 00000 00000 00000 seconds 24 HOUR UAS 00607 00607 00073 00072 seconds DS1 STATUS HLU HRU 24 HOUR BPV Seconds 00154 00000 24 HOUR UAS Count 00320 00469 Frame type No Activity N A Code type B8ZS N A...

Page 26: ...OOPBACK OFF HDU 1 HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN N A N A N A N A dB PULSE ATTN N A N A N A N A dB 24 HOUR ES 00000 00000 00000 00000 seconds 24...

Page 27: ...Q 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...

Page 28: ...versed at the HRU input port Loop 1 is specified to carry the simplex DC voltage and loop 2 is specified to carry the simplex DC voltage ACO Alarm Cut Off A minor alarm occurred and was retired by pre...

Page 29: ...ess The New Date field displays Set Date To set the system date type the month day and year in an mm dd yy format then press The Update Remote field displays All time information is lost when power is...

Page 30: ...tings menu Figure 11 Figure 11 System Settings Menu To change any option 1 Enter its character key which is shown inside the parenthesis within each parameter description This causes the screen to ref...

Page 31: ...ain acts as a standby circuit to T1 circuits whose line codes are not known or may be both AMI and B8ZS because it has the following two limitations The Auto mode induces one BPV in the T1 bit stream...

Page 32: ...the loss of one HDSL loop or a loop with low margin This is the preferred setting for initiating an AIS LOS state with just one conductor open in either of the HDSL pairs Short loops below approximat...

Page 33: ...to recognize all in band SmartJack loopback commands Special Loopback SPLB GNLB Configures the HiGain system to respond to the generic 3 4 in 7 in band loopback codes A1LB and A2LB Configures the HiG...

Page 34: ...framing AUTO mode in which it continuously searches the input T1 bit stream for a valid SF or ESF frame pattern This feature is required for fractional T1 applications DS0 blocking where it insures pr...

Page 35: ...present 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...

Page 36: ...re not available for one doubler systems Figure 13 Loopback Menu One Doubler 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...

Page 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...

Page 38: ...e Data screen you can do the following Press to view the previous four hour data screen Press to view the next four hour data screen Press to exit Press to view the next available span Since the HLU 3...

Page 39: ...NDS DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU 20 30 000 000 000 000 000 000 000 000 000 000 000 000 20 45 000 000 000 000 000 000 000 000 000 000 000 000 21 00 000 000 000 000 000 000 000 000 000 000...

Page 40: ...to zero by pressing Clear Since the HLU 388 is considered the master module this clears all performance data screens at both the HLU 388 and the HRU The RS 232 terminal interface at the HRU does not...

Page 41: ...ABLE 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 00000 01 27 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0...

Page 42: ...ch alarm Current column shows the status of each alarm Count column lists the number of times each alarm occurred Maximum non overflowing count is 999 From each Alarm History screen you can do the fol...

Page 43: ...nce of ES on HDSL1 Current condition number of alarms Span 1 ES HDSL 2 First and last instance of ES on HDSL 2 Current condition number of alarms Span 1 Margin L1 First and last instance of exceeded m...

Page 44: ...ximum then press If you type more than 24 characters a Beep sounds and only the first 24 characters are accepted as the Circuit ID 3 Press to confirm The ID appears in all HLU 388 screens The ID does...

Page 45: ...the HRU in loopback towards the network Set the TLOS switch at the HRU to disable ALRM H1ES HDSL Loop 1 Errored Seconds HDSL Loop 1 has exceeded the user selected 24 hour Errored Seconds threshold If...

Page 46: ...is the SmartJack SMJK loopback which enables an HRU response to the standard 2 3 in 5 SMJK in band loopback codes in emulation of standard Network Interface Device NID functions This option can be ena...

Page 47: ...2LB in that A5LB does not block the arming code from exiting the HLU 388 into the network A2LB can be configured to either block this arming code after 2 seconds and replace it with the AIS code or to...

Page 48: ...button a third time These same loopbacks can be initiated from the RS 232 Craft port by choosing the Loopback Mode option D from the Main Menu This displays the Loopback Menu Figure 12 on page 26 from...

Page 49: ...ridging jacks and another between the two SPAN jacks splits the XMT and RCV and creates metallic loopbacks towards both the DSX 1 and the HLU 388 If separate plugs are inserted into both SPAN jacks wi...

Page 50: ...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 SPA...

Page 51: ...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 upst...

Page 52: ...pback LED is either flashing indicating that the HRU is armed or lights steadily indicating that it is both armed and in loopback 4 Once armed the HLU 388 can be looped back by sending Intelligent Off...

Page 53: ...e NI LPDN and Disarm code 11100 The 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...

Page 54: ...Link Arming code 1111 F 1111 F 0100 4 1000 8 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 01...

Page 55: ...is loopback unless it is overridden by the reception of a second identical 16 bit loop up command before the timer expires When this time out override state exists the only way to loop the HLU 388 dow...

Page 56: ...This is the HEX number for the 4 bit group HLU 388 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 01...

Page 57: ...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 Heat Dissipation 6W without doubler 9W with doubler typical Maximum Power Consu...

Page 58: ...ack CPE Customer Premises Equipment CRC Cyclic Redundancy Check CREM Customer Remote Loopback CSA Carrier Servicing Area DDM Double Dual Module Plus DDS Digital Data Service DL Data Link DS1 Digital S...

Page 59: ...Interface NID Network Interface Device NLOC Network Local Loopback NREM Network Remote Loopback POTS Plain Old Telephone Service SAIS SmartJack AIS SF SuperFrame SNR Signal to Noise Ratio SPLB Specia...

Page 60: ...ion of HRU to which it is connected Older version HRUs require the odd DS0 time slots allocated to loop 1 and the even DS0 time slots to loop 2 Newer version HRUs require the allocation of DS0 time sl...

Page 61: ...List 2E and older List HRUs will respond differently in each direction for B8ZS inputs when in AMI mode The HLU 388 List 2E contains two separate power converters The main power supply converts 48 Vd...

Page 62: ...the maximum number of fully loaded shelves per bay that does not exceed the maximum allowable power dissipation density in Watts sq ft In COs the maximum power dissipation for open faced natural conv...

Page 63: ...worst case conditions Table 15 HLU 388 Power Parameters With HDU 451 60 mA CPE Current CO Voltage Volts CO Current Amps Power Consumption Watts HLU Power Dissipation Watts HDU Doubler Models OFF 42 5...

Page 64: ...value Maximum Span 2 Loop Resistance 2600 4 Span 1 Loop Resistance ohms For example if Span 1 Loop Resistance 550 ohms then Span 2 Loop Resistance must be no more than 400 ohms If Span 1 Loop Resista...

Page 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...

Page 66: ...of 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 chang...

Page 67: ...Components CLEI 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...

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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