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Issue 1, Section 150-231-164

Revision 04

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payloads of the HDSL channels.  The HLU-231, List 6D,
allocates the DSO time slots according to the version of
HRU-412 to which it is connected.  Older version HRUs
require the odd DSO time slots allocated to channel 1
and the even DSO time slots to channel 2.  Newer
versions allocated DSO time slots 1 through 12 to
channel 1, and time slots 13 through 24 to channel 2.
The 8 kbps frame bits of the DS1 stream are included on
both HDSL channels.  The two formatted HDSL
channels are passed to the HDSL transceivers which
convert them to 2B1Q format on the HDSL lines.  The
2B1Q line code is designed to operate in a full-duplex
mode on unconditioned pairs.  The transceiver echo
canceler and adaptive equalizer receive the signal from
the remote end in the presence of impairments and
noise on the copper pairs.

3.04

The received HDSL channels are processed by 
the transceiver and then passed on to the HLU-

231 List 6D multiplexer module.  The multiplexer
provides frame synchronization for each of the two
HDSL channels.  The multiplexer and HDSL
transceivers work under control of the HLU-231 List 6D
microprocessor and compensate for data inversions
caused by tip-ring reversals and for channel swaps
caused by pair reversals.  The HiGain system allows for
tip-ring or pair reversals, but does not tolerate split pairs.
By synchronizing to the Frame Sync Word (FSW) of
each channel, the multiplexer can reconstruct the

original 1.544 Mbps DS1 stream from the payloads of
the two HDSL channels.  The CRC fields on the HDSL
streams allow the HLU-231 List 6D to determine if errors
are present on the channel due to excessive
impairments on the HDSL pairs, or due to excessive
impulse or crosstalk noise.

3.05

The multiplexer removes data link messages 
from the HDSL channels and passes them to

the microprocessor.  This mechanism allows operations
messages and status to be exchanged between the
HLU-231 List 6D and the HRU-412 remote unit.

3.06

The reconstructed HDSL data channel is 
buffered in a first-in-first-out buffer (FIFO) within

the multiplexer.  A frequency synthesizer in conjunction
with the FIFO regulates the output bit rate and
reconstructs the DS1 clock at the exact rate received
from the remote end.  The HiGain system operates at
DS1 rates of 1.544 Mbps with up to ±200 bps of offset.

3.07

A DSX-1 interface driver converts the DS1 
channel to an Alternate Mark Inversion (AMI) or

Binary Eight Zero Substitution (B8ZS) format.  The DSX-
1 equalizer is programmable to five different lengths as
determined by the distance between the HLU-231 List
6D and the DSX-1 interface.  This provides CB-119
specification-compliant pulses at the DSX-1 interface
over a range of 0-655 feet of ABAM-specification cable.

Figure 2.  HLU-231, List 6D Block Diagram.  PairGain’s HDSL technology provides full-duplex services at standard T-1 rates over
copper wires between an HLU and an HRU, which comprise one HiGain system.

Summary of Contents for PLANT Series

Page 1: ...9 7 SPECIFICATIONS 10 8 CERTIFICATION 10 9 WARRANTY 10 B APPLICATIONS WITHOUT HIGAIN DOUBLER HDU 451 11 1 GENERAL 11 2 POWER CONSUMPTION 11 3 LOOPBACK OPERATION 11 4 TESTING 13 5 SYSTEM MAINTENANCE M...

Page 2: ...ervice is deployed over two unconditioned non loaded copper pairs Conventional in line T1 repeaters are not required Cable pair conditioning pair separation and bridged tap removal are not required 2...

Page 3: ...izing to the Frame Sync Word FSW of each channel the multiplexer can reconstruct the original 1 544 Mbps DS1 stream from the payloads of the two HDSL channels The CRC fields on the HDSL streams allow...

Page 4: ...231 List 6D to automatically match the terminal line baud rate from 1200 to 9600 baud Figure 6 through Figure 13 show the menu selections available from the terminal for non Doubler applications and...

Page 5: ...D front panel tri color STATUS LED has the following states GREEN Normal Operation FLASHING GREEN HDSL Acquisition FLASHING RED Minor Alarm For conditions see Paragraph 4 02 RED FUSEALRM YELLOW Self T...

Page 6: ...onfigures the HiGain system to respond to the Teltrend Mod 1 addressable repeater in band loopback codes PWRF DIS Disables powering to the HRU 412 ENA Enables powering to the HRU 412 ZBTS ON Tells the...

Page 7: ...ch can affect the data integrity UNFR Configures the HiGain system to operate in an unframed mode This mode disables the auto framing process and forces the HiGain system to function as a transparent...

Page 8: ...akes each unit s code independent of the DS1 code being received at the distant DS1 input port Thus if the line codes being received by HiGain are different in each of the two DS1 directions the HiGai...

Page 9: ...ow both down upstream equipment to be made aware of the loss of one HDSL loop or a loop with low margin This is the preferred setting to be able to initiate an AIS state with just one conductor open i...

Page 10: ...to comply with the limits for Class A digital devices pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment i...

Page 11: ...onditions other than these worst case ones would permit increasing the number of shelves per bay without jeopardizing the CO thermal integrity 2 04 The thermal loading limitations imposed when using t...

Page 12: ...he opposite end when the DS1 user code is set to AUTO This is caused by the fact that in the AUTO DS1 code mode the HLU 231 List 6D HRU 412 set their own code independent of each other Each end sets i...

Page 13: ...ive minutes if neither the MODE or SEL buttons are pressed The use of either button activates the 4 character display and restarts the 5 minute power control timer 4 03 If trouble is encountered on th...

Page 14: ...U 231 List 6D can be looped up from the remote location CREM by issuing the 6 in 7 command at the HRU 412 DS1 input port 8 The HRU 412 can be looped up from the remote location CLOC by issuing the 5 i...

Page 15: ...ncluding the frame bit occur in 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 p...

Page 16: ...101 5 1110 E 1010 A TIME OUT OVERRIDE Loopback Time out Override 1101 D 0101 5 1101 D 0110 6 FAR END NI ACTIVATE Unblock AIS pass 2 in 5 1100 C 0101 5 0101 5 0100 4 IOR POWER DOWN HLU Removes HDSL lin...

Page 17: ...rame bit occur in 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 bein...

Page 18: ...1 5 1110 E 1010 A TIME OUT OVERRIDE Loopback Time out Override 1101 D 0101 5 1101 D 0110 6 FAR END NI ACTIVATE Unblock AIS pass 2 in 5 1100 C 0101 5 0101 5 0100 4 IOR POWER DOWN HLU Removes HDSL line...

Page 19: ...d to execute all the HiGain loopbacks shown in Figure 5 Note that all code sequences must be present for at least five seconds ABBREVIATIONS USED BELOW LU LoopUp LD LoopDown NI Network Interface CI Cu...

Page 20: ...codes required to execute all the HiGain system loopbacks shown in Figure 5 Note that all code sequences must be present for at least five seconds ABBREVIATIONS USED BELOW LU LoopUp LD LoopDown NI Net...

Page 21: ...ogic errors including the frame bits occur in 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...

Page 22: ...K 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 IOR POWER DOWN HLU Removes HDSL line power 0110 6 0111 7 0110 6 0111 7 N...

Page 23: ...he simplex DC voltage and Loop 2 is specified to carry the simplex DC voltage LOOPBACKS SMJK Smart Jack Loopback Loopback at HRU 412 remote towards network initiated by 2 in 5 in band loopback code or...

Page 24: ...r time interval Earlier later data in four hour chunks on six different screens can be accessed by pressing P Previous or N Next respectively All of the counters can be set to zero by pressing C Clear...

Page 25: ...de this range indicate out of tolerance components or excessive temperature drift in critical components HDSL 24 Hour ES Errored Seconds The number of 1 second intervals that contained at least 1 CRC...

Page 26: ...Signal 2 The HLU HRU transceivers are trying to establish contact with each other ACQ 1 or 2 Acquisition 1 or Acquisition 2 The HLU HRU multiplexers are trying to establish synchronization over each...

Page 27: ...Displayed during System Settings review mode defined above CODE Line Code AMI B8ZS This is the line code that HLU 231 List 6D is receiving at its DSX 1 interface Displayed during System Setting review...

Page 28: ...Section 150 231 164 Revision 04 Page 28 Figure 6 HLU 231 List 6D Main Menu Figure 7 HLU 231 List 6D non Doubler Status...

Page 29: ...Issue 1 Section 150 231 164 Revision 04 Page 29 Figure 8 Set Clock Menu Figure 9 HLU 231 List 6D System Settings Main Menu...

Page 30: ...Section 150 231 164 Revision 04 Page 30 Figure 10 HLU 231 List 6D non Doubler Loopback Menu Figure 11 HLU 231 List 6D non Doubler Performance Data...

Page 31: ...Issue 1 Section 150 231 164 Revision 04 Page 31 Figure 12 HLU 231 List 6D non Doubler Performance Data History Figure 13 HLU 231 List 6D non Doubler Alarm History...

Page 32: ...guration shelves These guidelines limit the maximum fuse load to 85 of shelf rated capacity Use Table 12 when selecting the appropriate load fuses for the Building Distribution Fuse Bus BDFB when depl...

Page 33: ...re Use this data to perform this analysis on a case by case basis 3 LOOPBACK OPERATION 3 01 The HiGain system has a family of loopback options The most important of these is the Smart Jack loopback wh...

Page 34: ...etwork CDU1 and CDU2 are towards the customer All four loopbacks can be initiated by the 16 bit in band commands in SPLB states A1LB A2LB A3LB as described in Tables Table 14 Table 15 Table 16 respect...

Page 35: ...push button procedure permits any of the four HiGain loopbacks to be executed activated The next loopback option can be presented by pressing the MODE push button however the previously executed loop...

Page 36: ...31 List 6D DSX 1 interface verify that the HLU 231 List 6D Table 1 is making a positive connection with the mounting assembly s connector Also verify that the equalizer is set to EXT for driving exter...

Page 37: ...ge loopback from the remote location CDU1 by issuing the 4 in 6 loopback command at the HRU 412 DS1 input port 10 Doubler 1 can engage loopback from the local location NDU1 by issuing the 2 in 6 loopb...

Page 38: ...rors including the frame bit occur in 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 loop...

Page 39: ...01 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 NI ACTIVATE Unbl...

Page 40: ...s including the frame bit occur in 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 loopbac...

Page 41: ...01 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 NI ACTIVATE Unbl...

Page 42: ...e seconds ABBREVIATIONS USED BELOW LU LoopUp LD LoopDown NI Network Interface CI Customer Interface ESF DL Extended Super Frame Data Link ADDRESSABLE 3 A3LB REPEATER LOOPBACK COMMANDS Position Name Co...

Page 43: ...be present for at least five seconds ABBREVIATIONS USED BELOW LU LoopUp LD LoopDown NI Network Interface CI Customer Interface ESF DL Extended Super Frame Data Link ADDRESSABLE 4 A4LB REPEATER LOOPBAC...

Page 44: ...g the frame bit occur in 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...

Page 45: ...1 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 5 110...

Page 46: ...ns and only NLOC NREM CLOC CREM are available for non Doubler applications 5 07 Figure 23 through Figure 26 show the PERFORMANCE DATA screens for Doubler applications Both the Errored and Unavailable...

Page 47: ...bler and the HRU 412 for two Doubler circuits TABLE 19 HLU 231 LIST 6D STATUS MENU MESSAGES Message Full Name Description ALARMS NONE No Alarms LLOS Local Loss of Signal No signal from HLU 231 List 6D...

Page 48: ...Doubler 2 Loopback Loopback at Doubler 2 towards network initiated by IOR code or HLU 231 front panel MANUAL LOOPBACK push buttons or maintenance terminal Figure 14 CLOC Customer Local Loopback Loopba...

Page 49: ...cal components HDSL 24 Hour ES Errored Seconds The number of 1 second intervals that contained at least 1 CRC error This value is a running total of the last 24 Hours HDSL 24 Hour UAS Unavailable Seco...

Page 50: ...n Loops 1 or 2 of span 1 S2L1 or 2 Signal 2 Loop 1 or Loop 2 The 1st Doubler and either HRU or 2nd Doubler transceivers are trying to establish contact with each other on loops 1 or 2 of span 2 S3L1 o...

Page 51: ...ceive any response from the HRU Thus the HRU s integrity is questionable VER HLU Software Version This is displayed during the System Settings review mode Depress the MODE button for 3 seconds LIST 0x...

Page 52: ...Section 150 231 164 Revision 04 Page 52 Figure 15 HLU 231 List 6D Main Menu Figure 16 HLU 231 List 6D Status Display Span 1 1 or 2 Doublers...

Page 53: ...Issue 1 Section 150 231 164 Revision 04 Page 53 Figure 17 HLU 231 List 6D Status Display Span 2 1 Doubler Figure 18 HLU 231 List 6D Status Display Span 2 2 Doublers...

Page 54: ...Section 150 231 164 Revision 04 Page 54 Figure 19 HLU 231 List 6D Status Display Span 3 2 Doublers Figure 20 HLU 231 List 6D Set Clock Menu...

Page 55: ...Issue 1 Section 150 231 164 Revision 04 Page 55 Figure 21 HLU 231 List 6D Systems Settings Menu Figure 22 HLU 231 List 6D Doubler Loopback Menu...

Page 56: ...Section 150 231 164 Revision 04 Page 56 Figure 23 HLU 231 List 6D Performance Data Span 1 1 or 2 Doublers Figure 24 HLU 231 List 6D Performance Data Span 2 1 Doubler...

Page 57: ...Issue 1 Section 150 231 164 Revision 04 Page 57 Figure 25 HLU 231 List 6D Performance Data Span 2 2 Doublers Figure 26 HLU 231 List 6D Performance Data Span 3 2 Doublers...

Page 58: ...Section 150 231 164 Revision 04 Page 58 Figure 27 HLU 231 List 6D Performance Data History Span 1 1 or 2 Doublers Figure 28 HLU 231 List 6D Performance Data History Span 2 1 Doubler...

Page 59: ...Issue 1 Section 150 231 164 Revision 04 Page 59 Figure 29 HLU 231 List 6D Performance Data History Span 2 2 Doublers Figure 30 HLU 231 List 6D Performance Data History Span 3 2 Doublers...

Page 60: ...Section 150 231 164 Revision 04 Page 60 Figure 31 HLU 231 List 6D Alarm History Span 1 1 or 2 Doublers Figure 32 HLU 231 List 6D Alarm History Span 2 1 or 2 Doublers...

Page 61: ...Issue 1 Section 150 231 164 Revision 04 Page 61 Figure 33 HLU 231 List 6D Alarm History Span 3 2 Doublers...

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