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Section 150-231-134
Revision 01

Page 22

TABLE 8.  TEST PROCEDURES FOR A4LB OPTION

Step

Action

1

The HiGain Line Unit can be looped back (NLOC in Figure 4) by sending the (Addressable
Office Repeater) LPBK activation code 1111(F) 1111(F) 0001(1) 1110(E) for at least 5
seconds. This causes the HLU to enter its NLOC state shown in Figure 4. The display on the
HLU-231 alternates between NLOC (network local loop) and the margin displays.  The
Loopback Time-out option, which is user settable to NONE, 20, 60 or 120 minutes, determines
the duration of this loopback unless it is overridden by the reception of a second identical 16 bit
loopup command before the timer expires.  When this time-out override state exists, the only
way to loop the HLU down is to issue one of the three loopdown commands listed in Step 2.
The automatic time-out mode is restored during subsequent loopback sessions.

2

The following list summarizes the codes required to execute all the HiGain loopbacks shown in
Figure 4.  Note that all code sequences must be present for at least 5 seconds.

ABBREVIATIONS USED BELOW:

LU = LoopUp
LD = LoopDown
NI = Network Interface
CI = Customer Interface

ADDRESSABLE 4 (A4LB) REPEATER LOOPBACK COMMANDS

Position

Name

Code

HLU-231 LU FROM NI

NLOC

1111(F)*1111(F)0001(1)1110(E)

HLU-231 LU FROM CI

CREM

0011(3)1111(F)0001(1)1110(E)

HDU-451 DOUBLER 1 FROM NI

NDU1

1111(F)*1111(F)0000(0)0100(4)

HDU-451 DOUBLER 1 FROM CI

CDU1

0011(3)*1111(F)0000(0)0100(4)

HDU-451 DOUBLER 2 FROM NI

NDU2

1111(F)*1111(F)0000(0)0101(6)

HDU-451 DOUBLER 2 FROM CI

CDU2

0011(3)*1111(F)0000(0)0101(6)

HRU-412 LU FROM NI

NREM

1111(F)1111(F)0000(0)0010(2)

HRU-412 LU FROM CI

CLOC

0011(3)1111(F)0000(0)0010(2)

HRU-412 LU FROM NI

SMJK

11000 11000 11000

HRU-412 LU FROM NI (ESF-DL)

SMJK

1111(F)1111(F)0100(4)1000(8)

HLU & HRU LD FROM NI OR CI

11100 11100 11100

HLU & HRU LD FROM NI OR CI

100 100 100

HLU & HRU LD FROM NI OR CI
(ESF-DL)

1111(F)1111(F)0010(2)0100(4)

Note: The left most bit arrives first in all sequences. The detection algorithm functions reliably
with a random 10E

-3

 bit error ratio (BER) on the facility.

3

All of the above loopbacks can also be initiated from the front panel of the HLU with the MODE
and SEL pushbuttons. See Paragraph 10.9 for details. *This is the HEX number for the 4 bit
group.

Содержание HLU-231

Страница 1: ...3 SPECIFICATIONS 2 4 CERTIFICATION 3 5 WARRANTY 3 B FUNCTIONAL DESCRIPTION 4 6 OPERATIONAL CAPABILITIES 4 7 POWER CONSUMPTION 6 8 ALARM DESCRIPTION 8 9 SYSTEM OPTION SETTINGS 9 10 LOOPBACK DESIGN DESC...

Страница 2: ...HDSL Transmission on two pairs Front panel status indicating LED Automatic front panel display blanking DS1 LOS detector 125 consecutive zeros Margin threshold alarm HAIS SAIS options Easy return to f...

Страница 3: ...protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used i...

Страница 4: ...784 Kb Sec data streams The data streams contain HDSL frames that are nominally 4704 bits 6 milliseconds in length The HDSL frames contain a 14 bit Frame Sync Word FSW 6 bit Cyclic Redundancy Check CR...

Страница 5: ...terface driver converts the DS1 channel to an AMI or B8ZS format The DSX 1 equalizer is programmable to five different lengths as determined by the distance between the HLU and the DSX 1 interface Thi...

Страница 6: ...pins 20 21 7 03 The maximum HLU 231 power dissipation is the power that is converted into heat within the unit It contributes to the total heat generated and is used to determine the maximum number of...

Страница 7: ...5 0 58 25 9 0 ON 48 0 52 25 9 0 ON 56 0 43 25 9 0 TABLE 2 DEPLOYMENT GUIDELINES FOR HLU 231 LIST 3D WITH DOUBLER Shelf Type Shelf Fuse Amps Max of Doubler Systems per shelf 60 mA CPE I ON Max of Doubl...

Страница 8: ...f a minor alarm condition Alarms 4 5 6 can be inhibited by selecting NONE for the Errored Seconds Alarm ESAL system option See Section 9 for System Settings information The MAL X alarm can be disabled...

Страница 9: ...play to scroll through the HLU software version number its List and the type of frame pattern being received from the DSX 1 if the FRMG option is set to AUTO If FRMG is set to UNFR it displays UNFR Se...

Страница 10: ...hoice causes the 12 channels on the surviving loop to be lost as they are replaced by the AIS pattern However it does allow both down upstream equipment to be made aware of the loss of one HDSL loop o...

Страница 11: ...airs ENA Enables powering to the HRU over the HDSL pairs ZBTS ON Tells HiGain that the ESF frame is operating in its ZBTSI mode OFF Tells HiGain the ESF frame is operating in its normal non ZBTSI mode...

Страница 12: ...LOSW or if a margin alarm occurs SAIS ENA Causes the List 6 and 7 HRU to transmit the AIS signal towards the NI when in NREM or SMJK loopback DIS Causes the List 6 HRU to transmit the signal from the...

Страница 13: ...or doubler applications it permits looping doubler 1 towards the network NDU1 2 in 6 or towards the customer CDU1 4 in 6 Doubler 2 is looped towards the network with NDU2 3 in 6 or towards the custome...

Страница 14: ...pplication Note 910 Part 325 910 100 for more SPLB details 10 08 HiGain may take longer than normal to respond to inband loopback commands when its framing mode is set to UNFR and the inband commands...

Страница 15: ...as been damaged in transit immediately report the extent of damage to the transportation company and to PairGain 11 02 The HLU 231 is designed to mount in a 220 configuration ORB shelf or equivalent S...

Страница 16: ...owards the DSX 1 TABLE 4 TEST PROCEDURES FOR GNLB OPTION Step Action 1 Have the C O tester send the HRU 3 in 7 in band loop up for 5 seconds Observe that the HLU displays the NREM message indicating a...

Страница 17: ...he returned pattern 10 errors if ILR 1 were sent followed by normal looped data Note that this error pattern will repeat every 20 seconds as long as the IOR loopback pattern is being sent This same 20...

Страница 18: ...ack 1101 D 0101 5 1101 D 0101 5 IR ALTERNATE QUERY LPBK Alternate Query loopback 1101 D 0101 5 1110 E 1010 A TIME OUT OVERRIDE Loopback Time out Override 1101 D 0101 5 1101 D 0110 6 FAR END NIU ACTIVA...

Страница 19: ...the returned pattern 10 errors if ILR 1 were sent followed by normal looped data Note that this error pattern will repeat every 20 seconds as long as the IOR loopback pattern is being sent This same...

Страница 20: ...k 1101 D 0101 5 1101 D 0101 5 IR ALTERNATE QUERY LPBK Alternate Query loopback 1101 D 0101 5 1110 E 1010 A TIME OUT OVERRIDE Loopback Time out Override 1101 D 0101 5 1101 D 0110 6 FAR END NIU ACTIVATE...

Страница 21: ...S USED BELOW LU LoopUp LD LoopDown NI Network Interface CI Customer Interface ADDRESSABLE 3 A3LB REPEATER LOOPBACK COMMANDS Position Name Code HLU 231 LU FROM NI NLOC 1111 F 1111 F 0001 1 1110 E HLU 2...

Страница 22: ...esent for at least 5 seconds ABBREVIATIONS USED BELOW LU LoopUp LD LoopDown NI Network Interface CI Customer Interface ADDRESSABLE 4 A4LB REPEATER LOOPBACK COMMANDS Position Name Code HLU 231 LU FROM...

Страница 23: ...the returned pattern 10 errors if ILR 1 were sent followed by normal looped data Note that this error pattern will repeat every 20 seconds as long as the IOR loopback pattern is being sent This same...

Страница 24: ...9 0011 3 IR QUERY LPBK Query loopback 1101 D 0101 5 1101 D 0101 5 IR ALTERNATE QUERY LPBK Alternate Query loopback 1101 D 0101 5 1110 E 1010 A TIME OUT OVERRIDE Loopback Time out Override 1101 D 0101...

Страница 25: ...r HRU or 2nd Doubler transceivers are trying to establish contact with each other on loops 1 or 2 of span 2 S3L1 or 2 Signal 3 Loop 1 or Loop 2 The 2nd Doubler and HRU transceivers are trying to estab...

Страница 26: ...eview mode Depress the Mode button for 3 seconds LIST 0xL HLU s List Displayed during System Settings review mode defined above FRM Frame SF ESF UNFR NONE Defines the type of frame pattern being recei...

Страница 27: ...1 code HRU front panel push button or maintenance terminal See Figure 4 NLOC Network Local Loopback Loopback at HLU local towards network initiated from CO network by intelligent office repeater code...

Страница 28: ...ues outside this range indicate out of tolerance components or excessive temperature drift of critical components HDSL 24 Hour ES Errored Seconds The number of 1 second intervals that contained at lea...

Страница 29: ...in the sequence and format shown List 1 HRU 412 units having software versions 6 4 and above and all List 6 List 7 HRU units can also be set to the same time and date as the HLU by entering a U to the...

Страница 30: ...nd second doublers HDU1 HDU2 for two doubler circuits Span 3 refers to the loops between the second doubler and the HRU for two doubler circuits All status screens contain the same DS 1 interface erro...

Страница 31: ...Issue 1 Section 150 231 134 Revision 01 Page 31 Figure 7 HLU Status Display No Doublers Figure 8 HLU Status Display Span 1 1 or 2 Doublers...

Страница 32: ...Section 150 231 134 Revision 01 Page 32 Figure 9 HLU Status Display Span 2 1 Doubler Figure 10 HLU Status Display Span 2 2 Doublers...

Страница 33: ...Issue 1 Section 150 231 134 Revision 01 Page 33 Figure 11 HLU Status Display Span 3 2 Doublers Figure 12 Set Clock Menu...

Страница 34: ...Section 150 231 134 Revision 01 Page 34 Figure 13 System Settings Menu Figure 14 Loopback Menu No Doublers...

Страница 35: ...Issue 1 Section 150 231 134 Revision 01 Page 35 Figure 15 Loopback Menu 1 Doubler Figure 16 Loopback Menu 2 Doublers...

Страница 36: ...Section 150 231 134 Revision 01 Page 36 Figure 17 Performance Data No Doublers Figure 18 Performance Data Span 1 1 or 2 Doublers...

Страница 37: ...Issue 1 Section 150 231 134 Revision 01 Page 37 Figure 19 Performance Data Span 2 1 Doubler Figure 20 Performance Data Span 2 2 Doublers...

Страница 38: ...Section 150 231 134 Revision 01 Page 38 Figure 21 Performance Data Span 3 2 Doublers Figure 22 Performance Data History No Doublers...

Страница 39: ...Issue 1 Section 150 231 134 Revision 01 Page 39 Figure 23 Performance Data History Span 2 2 Doublers Figure 24 Performance Data History Span 2 1 Doubler...

Страница 40: ...Section 150 231 134 Revision 01 Page 40 Figure 25 Performance Data History Span 2 2 Doublers Figure 26 Performance Data History Span 3 2 Doublers...

Страница 41: ...Issue 1 Section 150 231 134 Revision 01 Page 41 Figure 27 HLU Alarm History No Doublers Figure 28 HLU Alarm History Span 1 1 or 2 Doublers...

Страница 42: ...Section 150 231 134 Revision 01 Page 42 Figure 29 HLU Alarm History Span 2 1 or 2 Doublers Figure 30 HLU Alarm History Span 3 2 Doublers...

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