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A-1

Section 61246045L1-5, Issue 2

61246045L1-5B

This Appendix describes the use and operation of
loopback control code sequences used in
ADTRAN’s HDSL system.

Loopback control codes are governed by the HTU-C
(and HRE(s) if deployed). Two types of HTU-Cs
exist which enable two different sets of loopback
codes: Standard or Enhanced loopbacks. The
Standard loopbacks are those that have been
contained in ADTRAN’s HDSL product family
beginning with 2

nd

Generation products. The

Enhanced loopbacks are contained in selected
ADTRAN HTU-C units. The following table
denotes whether the HTU-C (part number) contains
Standard or Enhanced loopback capabilities.

Standard Loopback

Part Number

Description

1242002Lx ............. 220/E220 HTU-C
1242016L1 ............. 3192 HTU-C
1242023L1 ............. DDM+ HTU-C
1244001L1 ............. E220/220 Low Voltage

T1 HTU-C

1244002L1 - L3 ..... Litespan AHDSL
1244002L4 - L6 ..... Litespan AHT1U
1245001L1-L2 ....... E220/220 Low Voltage

5

th

Gen HTU-C

1245003L1-L2 ....... DDM+ 5

th

Gen HTU-C

1245004L1-L2 ....... 3192 5

th

Gen HTU-C

Enhanced Loopback

Part Number

Description

1245001L4-L8 ....... E220/220 HTU-C
1245002L6 ............. Litespan AHT1U
1245003L4-L8 ....... DDM+ HTU-C
1245004L4-L8 ....... 3192 HTU-C
1246001L4-L8........E220/220 HTU-C

1246003L4-L8........DDM+HTU-C
1246004L4-L8........3192 HTU-C

The HREs and HTU-Rs’ loopback capabilities are
controlled from the central office unit (HTU-C).

NOTE:

If the HTU-C on a circuit contains Standard
loopbacks, then refer to subsection 1 of this
Appendix to determine its capabilities. If
the HTU-C on a circuit contains Enhanced
loopbacks, then refer to subsection 2 of this
Appendix to determine its loopback
capabilities.

A-1. STANDARD LOOPBACKS

This subsection describes operation of the HDSL
system in detection of in-band and ESF facility data
link loopback codes. The operation of the loopback
commands in the ADTRAN HDSL system is
compliant with the recommendation to ANSI
recorded in T1E1.4/92. The HDSL network
loopback points described below are shown in

Figures A-1 and A-2

.

HTU-C loopback is a regenerative loopback of the
DSX-1 signal toward the network.

HTU-R loopback is a regenerative loopback of the
DS1 signal toward the network. This loopback is in
addition to a separate Smartjack loopback. Separate
activation sequences are provided for the HTU-R
and the Smartjack loopback initiation. The HDSL
loopbacks are implemented such that the
downstream HDSL elements (toward the customer)
remain synchronized.

Figure A-1. HDSL Loopback Points

HTU-C

HTU-R

NIU

HRE #1

DSX-1

Interface

HDSL
Loops

HDSL
Loops

DS1
Interface

HRE #2

Appendix A

HDSL Loopbacks

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Содержание 239 HR

Страница 1: ...e HRE The unit extends the digital subscriber loop serving range up to 36 kft over 24 AWG twisted wire The HRE is used in conjunction with any span powering T1 HDSL transceiver unit for the central office HTU C and any Low Voltage HDSL transceiver unit for the remote end HTU R Compatible ADTRAN HDSL transceiver units are as follows Figure 1 ADTRAN 239 HRE 1246045L1 239 HRE LP1 LP2 LP1 LP2 LL Y N E...

Страница 2: ...ect Table 4 LED Indicators 2 INSTALLATION Remove the ADTRAN 239 HRE from the carton and visually ensure that damage has not occurred during shipping or handling If damage has occurred file a claim with the carrier then contact ADTRAN See Warranty and Customer Service subsection 7 of this practice The ADTRAN 239 HRE is shipped in a separate carton and must be installed in an environmental apparatus...

Страница 3: ...vice Area CSA guidelines CSA deployment guidelines are given below 1 All loops are non loaded only 2 For loops with 26 AWG cable the maximum loop length including bridged tap lengths is 9 kft 3 For loops with 24 AWG cable the maximum loop length including bridged tap lengths is 12 kft 4 Any single bridged tap is limited to 2 kft 5 Total bridged tap length is limited to 2 5 kft 6 The total length o...

Страница 4: ... ABACON 25 slot 819 25 Polymer 239 819A 12 16 SPC 7130 0656P TA DDMOKJOARA Stainless Air core 239 439 5 6 slot 7130 0656P TB2 DDMOLJOARA 6 Steel Gel filled no 819A Vertical stub down only 6 SPC 7130 V856P TQA DDMOKKOARA Stainless Air core 239 439 7 8 slot 7130 V856P TQB2 DDMOLKOARA 8 Steel Gel filled no 819A Vertical stub down only 8 Keptel 8 8 slot 820 8 Polymer 239 Vertical stub down only 8 AT T...

Страница 5: ...us and errors on CUST loop 1 It will flash once when an errored second is detected on CUST loop 1 Off No synchronization with the HTU R Green Synchronized with good signal quality on CUST loop 1 2 dB margin Yellow Synchronized with marginal signal quality on CUST loop 1 1 to 2 dB margin Red Synchronized with poor signal quality on CUST loop 1 0 dB margin CUST LP2 This LED indicates HDSL signal qua...

Страница 6: ...HRE customer remote loopback is active Figure 2 CSA Deployment Guidelines 0 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 WORKING LENGTH OF 26 GAUGE CABLE KFT WORKING LENGTH OF 24 GAUGE OR COARSER CABLE KFT 5 6 7 8 9 2 5 2 0 1 5 1 0 0 5 0 0 TOTAL BRIDGED TAP LENGTH KFT VALID CSA CABLE LENGTHS INVALID CSA CABLE LENGTHS Performance monitoring diagnostics and loopbacks are also available from the craft interf...

Страница 7: ... Weight 1 lb Environment Temperature Operating Standard 40 C to 70 C Storage 40 C to 85 C Relative Humidity Up to 95 non condensing 7 WARRANTY AND CUSTOMER SERVICE ADTRAN will replace or repair this product within 10 years from the date of shipment if it does not meet its published specifications or fails while in service see ADTRAN Carrier Networks Equipment Warranty Repair and Return Policy and ...

Страница 8: ...1246003L4 L8 DDM HTU C 1246004L4 L8 3192 HTU C The HREs and HTU Rs loopback capabilities are controlled from the central office unit HTU C NOTE IftheHTU ConacircuitcontainsStandard loopbacks then refer to subsection 1 of this Appendix to determine its capabilities If the HTU C on a circuit contains Enhanced loopbacks then refer to subsection 2 of this Appendix to determine its loopback capabilitie...

Страница 9: ...State transitions result from in band ESF data link sequences and timeout operations The sequences and timeouts are as follows Figure A 2 HDSL Element State Diagram ACTIVATION LOOP UP TIMEOUT ARMING TIMEOUT DEACTIVATION DISARM LOOP UP TIMEOUT DISABLE The Loop up Timeout Disable function is currently not supported LOOP UP TIMEOUT STATE ARMED STATE LOOP UP NO TIMEOUT STATE DISARMED STATE Arming in b...

Страница 10: ...HDSL elements make a transition from the disarmed state into the armed state All other control code sequences are ignored in the disarmed state The ESF data link sequence used to simultaneously arm the loopback capability of all HDSL elements is the standard 16 bit ESF data link sequence used for NIU Smartjack loop up Table A 1 HDSL Standard Loopback Control Codes Name Arming In band Arming ESF Ac...

Страница 11: ...m Sequence 11100 The disarming process ensures race free operation of HDSL element disarming and Smartjack loop down Duration of the disarm sequence may Table A 2 HDSL Loopback Control Codes Notes The Source column indicates which side of the interface the control codes are sent from For example an N indicates a network sourced code while a C indicates a customer sourced code All codes are inband ...

Страница 12: ... up to three HDSL elements The deactivation sequence does not disarm the HDSL elements They can still respond to activation sequence control codes All HDSL elements automatically move from the loop up state into the armed state when the selected loop up timeout value is reached Loop up Timeout programmable from HTU C at None 20 60 or 120 minutes Transition from Loop up to Disarmed State All HDSL e...

Страница 13: ... 5 1 3 The HTU C and any HRE units which are in the HDSL circuit are treated as Identical Tandem Dataports and the HTU R is treated as a Different Tandem Dataport Loopback Control Codes A summary of control sequences is given in Table A 3 NOTE In all control code sequences presented the in band codes are shown with the left most bit transmitted first and the ESF data link codes with the right most...

Страница 14: ... Loop up C742 1100 0111 0100 0010 1 ESF facility Datalink ESF only when set from the network an HTU R network loopback is activated and a 20 bit error confirmation is sent When set from the customer an HTU R customer loopback is activated with a 20 bit error confirmation Loopdown 9393 1001 0011 1001 0011 2 All units currently in loopback will loop down but remain in the armed state Query Loopback ...

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