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Section 150-441-124

June 12, 1997

Revision 01

Page 38

PairGain Engineering - Plant Series

HiGain HLU-D41

Table 17. HiGain Front Panel Loopbacks

Loopback type

Non-doubler
system

One-doubler
system

Two-doubler
system

NLOC

•

NREM

•

CLOC

•

CREM

•

NDU1

•

CDU1

•

NDU2

•

CDU2

•

The DDS type loopbacks Office Channel Unit (OCU) and Network Element Interface (NEI) are also
supported (see Section 25).

Table 18. Comprehensive Listing of all HiGain Loopbacks

Message

Full Name

Description

NLOC

Network Local Loopback

Loopback at HLU-D41 (local) towards network initiated from
DDS NEI loopback code, Mode and Choice Setup buttons or
Maintenance Terminal menu.

NREM

Network Remote Loopback

Loopback at HRU-512 (remote) towards network initiated from
HLU-D41 Mode and Choice Setup buttons, HRU-512 loopback
button or Maintenance Terminal menus.

CLOC

Customer Local Loopback

Loopback at HRU-512 (local) towards CI initiated from HLU-
D41 Mode and Choice Setup buttons or Maintenance Terminal
menus.

CREM

Customer Remote Loopback

Loopback at HLU-D41 (remote) towards customer initiated by
DDS OCU loopback code, Mode and Choice Setup buttons or
Maintenance Terminal menus.

NDU1

Network Doubler 1 Loopback

Loopback at first doubler towards network initiated by
HLU-D41 Mode and Choice Setup buttons or Maintenance
Terminal menu.

CDU 1

Customer Doubler 1 Loopback

Loopback at first doubler towards CI initiated by HLU-D41
Mode and Choice Setup buttons or Maintenance Terminal
menus.

NDU2

Network Doubler 2 Loopback

Loopback at second doubler towards network initiated by
HLU-D41 Mode and Choice Setup buttons or Maintenance
Terminal menus.

CDU 2

Customer Doubler 2 Loopback

Loopback at second doubler towards CI initiated by HLU-D41
Mode and Choice Setup buttons or Maintenance Terminal
menus.

Содержание HiGain HLU-D41

Страница 1: ...List Number Part Number CLEI Code HLU D41 2D 150 1260 24 T1L2BE0AAA PAIRGAIN TECHNOLOGIES INC ENGINEERING SERVICES TECHNICAL PRACTICE SECTION 150 441 124 01 Revision History of this practice June 12...

Страница 2: ...HE FRONT PANEL 15 12 Using the Mode and Choice Setup Buttons 15 13 Mandatory System Options 19 D SETTING OPTIONS FROM THE MAINTENANCE TERMINAL 21 14 Using the Maintenance Terminal Menus 21 15 Maintena...

Страница 3: ...elected using the front panel Mode and Choice Setup buttons and the Maintenance Terminal menus are italicized The Network Loopback option can be set to Enable or Disable Fields are identified with quo...

Страница 5: ...U 219 installed in a doubler enclosure provides the ability to double or even triple the transmission distance range for customer applications located outside the Carrier Service Area CSA The CSA incl...

Страница 6: ...options messages and alarm states see Section 12 Alarm messages are listed in Section 6 Mode and Choice Setup buttons Set system options see Section 12 DDS test access jacks Bantam jacks designated as...

Страница 7: ...tart up Time 30 seconds typical 60 seconds maximum per span Span Voltage 200 Vdc Compliance TA TSY 001210 Maximum Provisioning Loss 35 dB at 196 kHz 135 ohms Line Clock Rate Internal Stratum 4 clock M...

Страница 8: ...gauges at 196 kHz and 135 ohms The table applies to the HDSL cable pairs between the HLU HRU and HDU modules Without specific insertion loss measurement data add 3 dB for each bridged tap and 1 dB fo...

Страница 9: ...nd generates the Idle Code 7F or FF to complete a 12 DS0 payload for the half DS1 signal then the half DS1 signal is passed to the HDSL framer 4 The framer bit stuffs the half DS1 signal into the HDSL...

Страница 10: ...e bank s 5V power supply The HLU D41 draws 295mA of 5V power when the HRU is locally powered and 325mA when the HRU is line powered The worst case 5V current drain for D4 common equipment is 1 2A 5 3...

Страница 11: ...nit To conserve power the display remains active for only four minutes if neither the Mode or Choice setup buttons are pressed The use of either button re activates the four digit display and restarts...

Страница 12: ...front panel with the ACO Alarm Cut Off message The second part of the ALRM message which defines the cause of the alarm remains Both messages remain until the alarm condition clears or another alarm o...

Страница 13: ...in Engineering Plant Series Page 9 8 HLU D41 Card Edge Pin Out Diagram 8 1 The HLU D41 occupies one slot in an AT T type D4 channel bank or equivalent SLC 96 bank The card edge pin out diagram for the...

Страница 14: ...nks configured for Mode III special service operation Since SLC 96 channel slots do not receive signaling frame information SLC 96 HLU D41 applications cannot be configured for RBS and are restricted...

Страница 15: ...Time Slots 13 14 15 16 17 18 19 20 21 22 23 24 SLC 96 Mode III D1D Channel Counting Physical Slots 1 2 3 4 5 6 7 8 9 10 11 12 Time Slots 3 7 11 15 19 23 4 8 12 16 20 24 Physical Slots 13 14 15 16 17...

Страница 16: ...annel bank Figure 5 Figure 5 Installing an HLU D41 in a Channel Bank To install the HLU D41 into a channel bank 1 Slide the HLU D41 into the card guides for the desired slot then push the unit in unti...

Страница 17: ...pin RS 232 connector on the front of the HLU D41 allows you to connect your system to a dumb terminal or PC running a terminal emulation program with a standard RS 232 cable Once connected to a dumb...

Страница 18: ...41 slot configuration conflicts with another channel card s DS0 data A special power up sequence is built into the HLU D41 to preclude this interference with another channel card s DS0 data during the...

Страница 19: ...s and defines each of the modes and settings Options are listed in the sequence in which they appear in the front panel LCD Table 10 lists the four digit LCD messages The front panel LCD has a maximum...

Страница 20: ...ansported in Alternating DS0 time slots 1 3 5 23 Time slots 2 4 6 24 are not used CONT Customer data is transported in Contiguous DS0 time slots 1 2 3 12 Time slots 13 through 24 are not used HAIS ENA...

Страница 21: ...arm condition is in effect 1 xx HDSL Loop Margin Indicates the power of the received HDSL signal on each loop relative to noise Any value of 06 or greater is adequate for reliable system operation PWR...

Страница 22: ...new changes if neither button is pressed for 30 seconds 12 3 Setting Options to Factory Default Values Table 9 also shows the factory default values for the system options To set the options to the fa...

Страница 23: ...ions are retained if shelf power is lost or if the unit is unplugged 13 Mandatory System Options 13 1 During the initialization mode data cannot be transmitted to the D4 channel bank AIS is transmitte...

Страница 24: ...rm 3 Press the Mode Setup button The third press of the Mode Setup button confirms the current settings then exits the initialization mode When this procedure is completed the AIS signal is immediatel...

Страница 25: ...al Preference menu you must deselect Show Scroll Bars and Use Function Arrow and Ctrl Keys for Windows 14 2 Navigating the Maintenance Terminal menus Table 11 describes keys you can use on the dumb te...

Страница 26: ...ccess to submenus that allow you to issue and disable loopbacks from both the network and customer side Section 19 View Performance Data Provides access to submenus that allow you to view the Errored...

Страница 27: ...screen displays You can do the following Press C to clear the cur current min minimum and max maximum numeric counts Press U to update cur current values Press S to view each of the available span scr...

Страница 28: ...ignal than the 196 kHz loss PPM Offset Indicates the relative offset of the crystal oscillator in the HLU from the HDU crystal oscillator Any value between 100 and 100 is adequate 24 Hour ES The numbe...

Страница 29: ...the user Not Applicable Data for the indicated terminal parameter is not applicable on the fractional T1 system Table 15 HLU D41 Loopback Field Messages and Descriptions Message Full Name Description...

Страница 30: ...me of field where the invalid entry occurred error 17 3 Set Date To set the system date type the month day and year in a mm dd yy format then press Enter The Update Remote field displays 17 4 Update R...

Страница 31: ...een to refresh with the new settings After all parameters have been selected press E to exit then C to confirm The newly selected parameters are now activated 18 3 Idle Code The Idle Code option can b...

Страница 32: ...Timeout option name in the menu 18 8 HRU DS1 Code The HRU DS1 Code can be set to Auto B8ZS or AMI The default is AMI 1 Press D in the System Settings menu The HRU DS1 Code option changes to the next a...

Страница 33: ...tinue to transmit customer data 18 11 AIS on NREM The AIS on NREM option allows you to Enable the AIS signal toward the CPE when in the NREM loopback mode or to select Disable which transmits an LOS s...

Страница 34: ...ncreased in size the newly activated channels are initialized to CLR 18 14 2 Multiple channels may be changed by inserting a space between each channel entry Channels configured as RBS are marked with...

Страница 35: ...ain menu NLOC now appears next to the Loopback Mode in the Main menu The loopback continues to cycle in the system depending upon your Loopback Timeout setting You can always go back to the Loopback m...

Страница 36: ...interface To send a CLOC loopback press H in the Loopback menu The following prompt appears PLEASE WAIT A series of dots moves from left to right indicating that the command has been issued When this...

Страница 37: ...or one doubler circuits or between the first and second doublers HDU1 and HDU2 for two doubler circuits 20 2 3 Span 3 The Span 3 screen refers to the loops between the second doubler and the HRU 512 f...

Страница 38: ...an 2 The Span 2 Screen refers to the loops between the first doubler HDU1 and the HRU 512 for one doubler circuits or between the first and second doublers HDU1 and HDU2 for two doubler circuits 21 2...

Страница 39: ...nd last instance of ES on HDSL1 Current condition number of alarms Span 1 Margin L1 First and last instance of exceeded margin on Loop 1 Current condition number of alarms PWR Open Power condition Ope...

Страница 40: ...ailable span screen Press E to exit the menu 23 Enter Circuit ID 23 1 To enter a circuit ID 1 Press H from the Maintenance Terminal Main Menu to view the Enter Circuit ID screen The following message...

Страница 41: ...returned signal with the transmitted signal and to determine if there is a problem with the circuit This section addresses loopbacks issued from the front panel see Section 19 for loopbacks issued fro...

Страница 42: ...n or Maintenance Terminal menus CLOC Customer Local Loopback Loopback at HRU 512 local towards CI initiated from HLU D41 Mode and Choice Setup buttons or Maintenance Terminal menus CREM Customer Remot...

Страница 43: ...configured by the HLU D41 are unaffected 24 2 4 CREM Loopback A CREM loopback operates similarly to a CLOC loopback except that in a CREM loopback the CI signal is looped back to the CPE at the HLU D...

Страница 44: ...s plugged in Circuit signals are provided at the Logic In and Logic Out jacks while clock is provided to the test set by the Office Interface Unit OIU in the D4 channel bank Near and far access is als...

Страница 45: ...60 months from the date of original shipment given proper customer installation and regular maintenance PairGain will repair or replace any unit without cost during this period if the unit is found t...

Страница 46: ...cation Signal AMI Alternate Mark Inversion BER Bit Error Ratio BPV Bipolar Violation CI Customer Interface CO Central Office CLOC Customer Local Loopback CLR Clear Channel Signaling Code type Type of...

Страница 47: ...er Unit HLU HiGain Line Unit HRE HiGain Remote Enclosure HRU HiGain Remote Unit HLU Ver w x y w x software version number of the HLU D41 y list of HLU D41 HRU Ver a b c a b software version number of...

Страница 48: ...ation of the 2B1Q pulse from the distant end The HiGain system operates with pulse attenuations in excess of 30 dB This value is related to the cable pair s 196 kHz loss The pulse attenuation is a mor...

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