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HDSL4 239 H4R Repeater Installation and Maintenance Practice

12

61223445L2-5B

Fast Retrain

Fast Retrain is an ADTRAN-proprietary feature that minimizes downtime when an inter-
mittent, non-power related impairment (bad splice, noise burst, etc.) affects the HDSL loop 
and cannot be bridged.
When such an impairment occurs after achieving HDSL synchronization, Fast Retrain is 
invoked to restore service within 5 to 7 seconds. This short retrain time allows for reduced 
downtime compared to the traditional 25 to 30 second retrain duration.

NOTE

For proper functionality, install Fast Retrain capable units on both
ends of the circuit. Failure of a Fast Retrain attempt initiates the
traditional (25-30 second) retrain.

HDSL2 and HDSL4 transceivers normally train in approximately 25 to 30 seconds (for initial 
turnup, this time frame should be acceptable). However, once service has been established on 
the circuit, any large down-time will interrupt communications on the circuit. A loss of 
synchronization on the HDSL loop can cause excessive down times due not only to the 30-
second HDSL retrain time, but also further delays due to the higher level protocols in the 
network going through re-synchronization. On the older generation HDSL2 and HDSL4 units, 
a 1-second loss of HDSL frame synchronization would cause the data pumps to retrain. This 
retrain would take approximately 25 seconds during which AIS would be sent to the termi-
nating equipment. The reception of AIS by the terminating equipment then might trigger 
higher level protocol re-synchronizations.
In an effort to minimize this down time, the Fast Retrain feature has been implemented. If an 
impairment (bad splice, for example) causes the HDSL data pump to lose frame synchroni-
zation for 500 msec or longer, instead of retraining, the system attempts a Fast Retrain. This 
abbreviated train can achieve data mode in 5 to 7 seconds. A successful fast retrain should be 
evident by watching the Span Status screen and by reduced unavailable seconds (UAS) in the 
PM data for each LOS alarm recorded.

Содержание 239 H4R

Страница 1: ...HDSL4 239 H4R Repeater Installation and Maintenance Practice Document Number 61223445L2 5B CLEI T1R6189D_ _ June 2009 ...

Страница 2: ...f this Document The contents of this document are current as of the date of publication ADTRAN reserves the right to change the contents without prior notice In no event will ADTRAN be liable for any special incidental or consequential damages or for commercial losses even if ADTRAN has been advised thereof as a result of issue of this document 901 Explorer Boulevard P O Box 140000 Huntsville AL 3...

Страница 3: ... references to other documentation and is also used for emphasis This font indicates on screen messages and prompts This font indicates text to be typed exactly as shown This font indicates silk screen labels or other system label items This font is used for strong emphasis NOTE Notes inform the user of additional but essential information or features CAUTION Cautions inform the user of potential ...

Страница 4: ... on product features and functions while covering applications of ADTRAN product lines ADTRAN provides a variety of training options including customized training and courses taught at our facilities or at customer sites For inquiries concerning training contact ADTRAN Training Phone 800 615 1176 ext 7500 Training Fax 256 963 6700 Training Email training adtran com ...

Страница 5: ...Contents 7 Installing the Module 8 Front Panel LEDs 9 Feature Details 10 Fault Bridging 10 Bad Splice Detection 10 View Splice Results Screen 11 Example 11 Fast Retrain 12 Connections 13 HDSL4 Deployment Guidelines 14 239 H4R Capacity Guidelines 14 Maintenance 17 Specifications 18 Appendix A Warranty A 1 Warranty and Customer Service A 1 ADTRAN Sales A 1 ADTRAN Technical Support A 1 ADTRAN Repair ...

Страница 6: ...ew Splice Results Screen 11 Tables Table 1 239 H4R Electrical Characteristics 3 Table 2 Compliance Codes 4 Table 3 Front Panel LEDs 9 Table 4 239 H4R Card Edge Pin Assignments 13 Table 5 239 H4R Capacity Guidelines for ADTRAN Housings 15 Table 6 239 H4R Capacity Guidelines for Other Housings 16 Table 7 239 H4R Specifications 18 ...

Страница 7: ...ty with ADSL and other transport technologies The ADTRAN HDSL4 239 H4R Repeater 239 H4R P N XXXXXXXLX regenerates the HDSL4 signal extending the range of the HDSL4 circuit The 239 H4R has enhanced troubleshooting capabilities in the presence of shorts or ground faults on the customer side of the repeater Figure 1 illustrates the 239 H4R front panel Figure 1 239 H4R Front Panel ...

Страница 8: ...445L1 and enhanced features and capabilities Basic Features The basic features of the 239 H4R include the following TC PAM line coding Lightning protection In band loopback control Standard 239 form factor repeater apparatus case design Bad Splice Detection refer to Bad Splice Detection on page 10 Fast Retrain refer to Fast Retrain on page 12 TSCAN Enhanced Features Enhancements include the follow...

Страница 9: ...stomer side and every three seconds will actively monitor the customer side for the fault to clear Once the 239 H4R detects that the condition is clear the relays close allowing span powering to pass to the customer side NOTE The isolation process is only possible if the apparatus case is properly grounded Electrical Characteristics That following table lists the electrical characteristics of all ...

Страница 10: ...he compliance codes for the 239 H4R This device complies with Part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference 2 This device must accept any interference received including interference that may cause undesired operation Changes or modifications not expressly approved by ADTRAN could void the user s authority to operate ...

Страница 11: ... 3 and 5 as defined in Appendix B of GR 1089 CORE Issue 4 and meets the lightning and power fault criteria with primary protectors that meet any of the voltage limits of GR 974 CORE or GR 1361 CORE i e carbon blocks gas tubes and solid state NOTE Current limiting protectors are not required ...

Страница 12: ... 239 H4R repeaters can be added to extend the range of a loop The following criteria determines repeater placement On single 239 H4R loops consider the attenuation properties of the loop segment For a circuit requiring two 239 H4Rs satisfy both segment attenuation and segment DC resistance requirements For a circuit requiring three 239 H4Rs satisfy all H4TU C and H4TU R hardware requirements segme...

Страница 13: ...lowing items HDSL4 239 H4R Repeater P N 1223445L2 HDSL4 239 H4R Repeater Job Aid P N 61223445L2 22 HDSL4 239 H4R Repeater Compliance Notice P N 61223445L2 17 CAUTION Electrostatic discharge ESD can damage electronic modules When handling modules wear an antistatic discharge wrist strap to prevent damage to electronic components Place modules in antistatic packing material when transporting or stor...

Страница 14: ...d The H4TU C provides power to the 239 H4R independent of line impedance or wire gauge The span power from the H4TU C is passed through the 239 H4R and can also span power additional H4Rs the H4TU R or both Refer to the HDSL4 Deployment Guidelines on page 14 The 239 H4R is suitable for deployment in any environmentally controlled 239 type apparatus case A retainer latch is available for securing t...

Страница 15: ...nce per second indicates synchronization with a SNR margin of 0 dB attenuation is greater than the Loop Attenuation Alarm Threshold LP1 LP2 CUST Off z Green 4 Green Fast Flashing 4 Green Slow Flashing z Yellow 4 Yellow Flashing z Red 4 Red Flashing No span power is present Synchronized with an Signal to Noise Ratio SNR margin greater than the SNR Margin Alarm Threshold Flashing three times per sec...

Страница 16: ...nsmission equipment until oxidation with the splice itself causes a rapid impedance change which can cause errors signal margin fluctuation and retrain of the DSL transceivers The splice detection feature is available from the Trouble shooting Screen through the craft access port Data transmission transceivers especially echo cancelled technologies are subject to perfor mance degradations and erro...

Страница 17: ...it Number Indicates if the number of times an anomaly was detected exceeds the detection count threshold of eight The number in this column represents the number of feet from the transceiver Reference Point to the anomaly This number also reflects the highest anomaly count the unit sees as it is possible to have more than one bad splice per circuit This screen reports the worst most frequently det...

Страница 18: ...me will interrupt communications on the circuit A loss of synchronization on the HDSL loop can cause excessive down times due not only to the 30 second HDSL retrain time but also further delays due to the higher level protocols in the network going through re synchronization On the older generation HDSL2 and HDSL4 units a 1 second loss of HDSL frame synchronization would cause the data pumps to re...

Страница 19: ...assis ground is securely connected to the OSP apparatus case Table 4 lists the ground pin designations Table 4 239 H4R Card Edge Pin Assignments Pin Designation Description 1 GND Ground 2 NC No Connect 3 T1 Customer Loop 1 Tip 4 R1 Customer Loop 1 Ring 5 T1 Network Loop 1 Tip 6 R1 Network Loop 1 Ring 7 NC No Connect 8 T Network Loop 2 Tip 9 R Network Loop 2 Ring 10 GND Ground 11 T Customer Loop 2 ...

Страница 20: ...ith part numbers 1221401L6 1221403L6 and 1221404L6 support only one 239 H4R in the HDSL4 circuit Refer to the Detailed Status Screen by accessing the menus on the H4TU C craft terminal interface for current Signal to Noise Ratio Margin and Attenuation status indications for the circuit 239 H4R Capacity Guidelines The 239 H4R is designed for installation in a prewired apparatus case Table 5 and Tab...

Страница 21: ... 1150027L1 239 439 Housing DDMOABA1MA 4 Air 4 4 All All Stainless Polymer 1150027L2 239 439 Housing DDMOBBA1MA 4 Gel 4 4 All All Stainless Polymer 1150057L1 Universal Housing DDMODA01RA 4 Air 4 4 All All Stainless Steel 1150057L1 Universal Housing DDMODA01RA 4 Gel 4 4 All All Stainless Steel 1150058L1 Universal Housing DDMOEE01RA 8 Air 8 8 All All Stainless Steel 1150058L2 Universal Housing DDMOFE...

Страница 22: ... Stainless Steel Circa Telecom HDSL 12B 760006 12 12 12 All All Stainless Steel Arris Lucent AT T Keptel Inter Link 809 RF809A3 XXX or RF809B3 XXX 12 8 N A 1 3 4 6 7 9 10 12 N A Polymer Arris Lucent AT T Keptel Inter Link 818 819 RF819A1 or RF819A2 RF819B1 or RF819B2 25 12 16 Chamber 1 1 4 7 8 11 14 Chamber 2 15 17 19 20 23 25 Chamber 1 1 3 5 7 8 10 12 14 Chamber 2 15 16 18 19 20 22 24 25 Polymer ...

Страница 23: ...ugh the channel allowing digital loopback in fault isolation The loopback is activated remotely The type of loopbacks the 239 H4R supports are dependent on the loopback capabilities of the transceiver units in use on the circuit Refer to the applicable installation and maintenance practice of the specific H4TU C or H4TU R for a list of loopback codes Performance monitoring diagnostics and loopback...

Страница 24: ...pan powered by H4TU C Loop Interface Modulation Type Mode Number of Pairs Line Rate Baud Rate Loop Loss Bridged Taps Performance H4TU C Transmit Power Data Level H4TU C Transmit Power Activation Level Input Impedance Maximum Loop Resistance Return Loss 16 TC PAM Full Duplex Partially overlapped echo canceling 2 1 552 Mbps 261 333 k baud Refer to HDSL4 Deployment Guidelines on page 14 Single Taps 2...

Страница 25: ...nitiated with in band codes or from H4TU C or H4TU R craft interface Compliance UL 60950 GR 63 CORE GR 1089 CORE NEBS Level 3 SR 3580 FCC 47CFR Part 15 Class A Part Number HDSL4 239 H4R Repeater XXXXXXXLX Table 7 239 H4R Specifications Specification Description ...

Страница 26: ...HDSL4 239 H4R Repeater Installation and Maintenance Practice 20 61223445L2 5B This page is intentionally blank ...

Страница 27: ...es support Customer and Product Service CAPS requests or further information ADTRAN Sales Pricing Availability 800 827 0807 ADTRAN Technical Support Pre Sales Applications Post Sales Technical Assistance 800 726 8663 Standard hours Monday Friday 7 a m 7 p m CST Emergency hours 7 days week 24 hours day ADTRAN Repair CAPS Return for Repair Upgrade 256 963 8722 Repair and Return Address Contact CAPS ...

Страница 28: ...Carrier Networks Division 901 Explorer Blvd Huntsville AL 35806 ...

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