ADTRAN Network Card 239 T1 HDSL4 User Manual

®
239 T1 HDSL4 Repeater (H4R)  
Installation and Maintenance Practice  
Part Number - 61223445L1-5D  
239 H4R  
1223445L1  
LP1  
NET  
LP2  
LP1  
CUST  
LP2  
LL RL  
/
(Y) (G)  
CLEI: T1R6U87D_ _  
October 2004  
 
239 H4R Installation and Maintenance Practice  
Revision History  
Revision  
Date  
Description of Changes  
D
October 2004  
Updated to add Bad Splice Detect and Fast Retrain feature  
descriptions  
Conventions  
The following typographical conventions are used in this document:  
This font indicates a cross-reference link. First-time references to tables and figures are shown in  
this font.  
This font indicates screen menus, fields, and parameters.  
THIS FONT indicates keyboard keys (ENTER, ESC, ALT). Keys that are to be pressed simultaneously  
are shown with a plus sign (ALT+X indicates that the ALT key and X key should be pressed at the  
same time).  
This font indicates references to other documentation and is also used for emphasis.  
This fontindicates on-screen messages and prompts.  
This fontindicates text to be typed exactly as shown.  
This font indicates silkscreen 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 damage, malfunction, or disruption to equip-  
ment, software, or environment.  
WARNING  
Warnings inform the user of potential bodily pain, injury, or death.  
61223445L1-5D  
iii  
 
239 H4R Installation and Maintenance Practice  
Training  
ADTRAN offers training courses on our products. These courses include overviews on product  
features and functions while covering applications of ADTRAN’s product lines. ADTRAN  
provides a variety of training options, including customized training and course taught at our facil-  
ities or at customer sites. For more information about training, please contact us.  
Training Phone:  
Training Fax:  
800-615-1176, ext. 7500  
256-963-6700  
Training Email:  
iv  
61223445L1-5D  
 
Contents  
Figures  
Tables  
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Tables  
239 H4R Installation and Maintenance Practice  
This page is intentionally blank.  
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61223445L1-5D  
 
239 T1 HDSL4 Repeater (H4R)  
1. GENERAL  
This practice is an installation and maintenance guide for the ADTRAN® 239 T1 HDSL4 Repeater (H4R) (239  
H4R). Figure 1 illustrates the 239 H4R (P/N 1223445L1) front panel.  
239 H4R  
1223445L1  
LP1  
NET  
LP2  
LP1  
CUST  
LP2  
LL RL  
/
(Y) (G)  
Figure 1. HDSL4 239 T1 HDSL4 Repeater (H4R)  
2. DESCRIPTION  
HDSL4 provides extended range T1 (DS1) transport on the telecommunications network. HDSL4 features spectral  
compatibility with ADSL and other transport technologies.  
This 239 H4R performs signal regeneration to extend the range of the HDSL4 circuit.  
The H4TU-C (Central Office Transceiver) unit receives DSX-1 input signals from the network through the chassis,  
transports them across the HDSL4 circuit, and terminates them through an H4TU-R remote unit which provides a  
traditional DS1 to customer equipment. The H4TU-C provides testing, provisioning, and performance monitoring  
capabilities that address circuit status.  
The H4TU-C works in conjunction with the ADTRAN H4TU-R (Remote) and up to three H4Rs (Repeaters) to  
provide a DS1 service on the local loop.  
61223445L1-5D  
1
 
     
Description  
239 H4R Installation and Maintenance Practice  
Features  
The basic features of the HDSL4 239 T1 HDSL4 Repeater (H4R), include the following:  
• TC PAM line coding  
• Lightning protection  
• In-band loopback control  
• Standard 239 form factor repeater apparatus case design  
• Remote provisioning and pass-through performance monitoring  
• Bad Splice Detection  
• Fast Retrain  
Bad Splice Detection Feature  
TM  
This 239 H4R supports the Runtime TScan 2.0 bad splice detection feature, an ADTRAN proprietary non-intru-  
sive algorithm for detection of anomalies (bad splices) in the copper pair.  
Data transmission transceivers (especially echo-cancelled technologies) are subject to performance degradations  
and errors in the presence of bad splices. A splice may be benign for a period of time, allowing a circuit to behave  
appropriately for portions of the day. However, over time the splice will oxidize and incur small, rapid changes in  
impedance. This inconsistency in behavior makes the problem difficult to locate. Additionally, an impedance  
change that is large enough to cause the transceiver trouble may still be small enough to be undetected by test  
equipment utilized on the copper pairs. Therefore a non-intrusive method of identifying these bad splices has been  
developed to aid the customer in troubleshooting their distribution plant.  
NOTE  
The Splice Detection Feature is included with this product as an aid to trouble-  
shooting. Due to inconsistency in environmental conditions and their effect on  
telecommunications plant, ADTRAN cannot guarantee the accuracy of the  
measurements. Comparison to existing engineering drawings should provide exact  
locations of suspect splices indicated by ADTRAN algorithms.  
Splices that are varying in impedance will cause the HDSL data pump to see a reduced and/or fluctuating signal  
quality (margin). The HDSL data pump will attempt to track these changes. When the changes become too severe,  
errors or loss of synchronization result.  
View Splice Results Screen  
The Bad Splice Detection feature is accessed from the Troubleshooting screen via the craft access terminal of the  
H4TU-C or H4TU-R. Selecting the View Splice Results option from the Troubleshooting screen menu displays the  
screen illustrated in Figure 2. Results will be reported in the Splice Detection Results column for each transceiver:  
NTF - Reported if the unit is active and no problems have been detected or the number of anomalies detected  
have not yet reached the detection count threshold, which facilitates the reporting of the result to this screen.  
(Eight is the present threshold.)  
LOS - Reported if the remote unit has not been detected.  
Number - Reported if an anomaly has been detected a number of times that exceeds the detection count threshold  
of eight. The number shown in this column represents the number of feet from the transceiver (Reference Point)  
2
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239 H4R Installation and Maintenance Practice  
Description  
to that anomaly. This number will also reflect the highest anomaly count seen, as it is possible to have more than  
one bad splice per circuit. This screen will report the worst (most frequently detected) anomaly.  
In this example, a detection has occurred approximately 650 feet from an H4TU-C module on Loop 2 of the  
HDSL4 circuit.  
Circuit ID:HTSVALHDSL4  
Press ESC to return to previous menu  
06/17/04 07:32:04  
* Note: Chronic Circuit Results are only valid after all other circuit  
*
* qualification tests have been performed and failed to show a trouble !! *  
Splice Detector Version 1 Result Definitions:  
---------------------------------------------  
NTF  
LOS  
- No Trouble Found yet.  
- Unit not in sync.  
Number - Distance from Reference point (in ft.) of suspect splice.  
Reference  
Point  
---------  
H4TUC  
Splice Detection Results  
Version  
Number  
-------  
01  
Result Shown  
for date  
MM/DD/YY  
Loop 1  
----------  
NTF  
Loop 2  
----------  
650  
--------  
H4TUR  
NTF  
NTF  
01  
06/17/04  
H4RU1 NET  
H4RU1 CST  
NTF  
NTF  
NTF  
NTF  
01  
01  
(B)Back  
Figure 2. Splice Results Screen  
Fast Retrain Feature  
Fast Retrain is an ADTRAN proprietary feature whose intent is to minimize downtime when an intermittent non  
power-related impairment (bad splice, noise burst, etc.) affects the HDSL loop and cannot be bridged.  
HDSL2 and HDSL4 transceivers normally train in approximately 25 to 30 seconds. For an initial circuit turn-up,  
this is not a big issue. 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 terminating 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 synchronization for 500 msec or longer, instead of  
retraining, a fast retrain will be attempted. 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.  
NOTE  
Fast-Retrain capable units must be installed on both ends of the HDSL4 circuit for  
this feature to function properly. Also, if there is a failure of a fast retrain attempt,  
for any reason, then the traditional (25-30 second) retrain will be initiated.  
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3
 
   
Description  
239 H4R Installation and Maintenance Practice  
Compatibility  
The 239 H4R is used in conjunction with any T1.418 compliant span powering H4TU-C and H4TU-R. Compatible  
ADTRAN HDSL4 transceiver units are listed in Table 1.  
Table 1. ADTRAN Unit Compatibility  
Part Number  
Unit Name  
118141xLy  
122x401Ly  
122x403Ly  
122x404Ly  
122x407Ly  
122x424Ly  
122x426Ly  
Total Access 3000 H4TU-C  
220 H4TU-C  
DDM+ H4TU-C  
3192 H4TU-C  
Soneplex H4TU-C  
T200 H4TU-R, Local Power  
T200 H4TU-R, Span Power  
x = any generic number; y = any list number  
Due to span power limits, the number of H4Rs permitted in the circuit depends upon the type of H4TU-C utilized.  
An ADTRAN 239 H4R provides DS1 transport on all revised resistance design (RRD) 26 AWG and/or 24 AWG  
loops. Three ADTRAN 239 H4R repeaters may be added to extend the range of a loop.  
Repeater placement is determined by the following criteria:  
• On single H4R loops, only on the attenuation properties of the loop segment must be considered.  
• For a circuit requiring two H4Rs, both segment attenuation as well as segment DC resistance requirements be  
satisfied.  
• For a circuit requiring three H4Rs, H4TU-C and H4TU-R hardware requirements, segment attenuation, and  
segment DC resistance requirements must all be satisfied.  
Refer to the “HDSL4 Deployment Guidelines” on page 6 of this practice and the Installation and Maintenance  
Practice for the deployed H4TU-C.  
Compliance  
Table 2 shows the compliance codes for the 239 H4R. The 239 H4R is NRTL listed to the applicable UL standards.  
The 239 H4R is to be installed in a restricted access location and in a Type “B” or “E” enclosure only.  
Table 2. Compliance Codes  
Code  
Input  
Output  
Power Code (PC)  
C
C
X
Telecommunication Code (TC)  
Installation Code (IC)  
A
4
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239 H4R Installation and Maintenance Practice  
Installation  
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 this  
equipment.  
3. INSTALLATION  
C A U T I O N !  
SUBJECT TO ELECTROSTATIC DAMAGE  
OR DECREASE IN RELIABILITY.  
HANDLING PRECAUTIONS REQUIRED.  
After unpacking the 239 H4R, inspect it for damage. If damage has occurred, file a claim with the carrier, then  
contact ADTRAN Customer Service. Refer to “Appendix A, Warranty” for further information. If possible, keep  
the original shipping container for returning the 239 H4R for repair or for verification of shipping damage.  
Shipping Contents  
The contents include the following items:  
• 239 T1 HDSL4 Repeater (H4R)  
• 239 T1 HDSL4 Repeater (H4R) Job Aid  
CAUTION  
Electronic modules can be damaged by ESD. When handling modules, wear an  
antistatic discharge wrist strap to prevent damage to electronic components. Place  
modules in antistatic packing material when transporting or storing. When working  
on modules, always place them on an approved antistatic mat that is electrically  
grounded.  
There are no manual option settings for the H4R.  
H4R power is derived from an H4TU-C, independent of line impedance or wire gauge. The operating power from  
the H4TU-C may also be used to span power the H4TU-R.  
The 239 H4R is designed for deployment in any environmentally controlled 239-type apparatus case.  
A retainer latch is available for securing the 239 H4R in the apparatus case.  
When installing the ADTRAN 239 H4R refer to the Installation and Maintenance Practice for the housing being  
used.  
61223445L1-5D  
5
 
   
Connections  
239 H4R Installation and Maintenance Practice  
4. CONNECTIONS  
All connections are made through card edge connectors.  
Table 3 provides the card edge pin assignments.  
CAUTION  
The H4R dissipates a maximum of 5.4 watts.  
NOTE  
Ensure that the chassis ground is securely connected to the apparatus case. Ground  
pin designations are defined in Table 3.  
Table 3. H4R Card Edge Pin Assignments  
Pin  
Designation  
Description  
1
2
GND  
NC  
T1  
R1  
T1  
R1  
NC  
T
Ground  
No Connect  
3
Customer Loop 1 Tip  
Customer Loop 1 Ring  
Network Loop 1 Tip  
Network Loop 1 Ring  
No Connect  
4
5
6
7
8
Network Loop 2 Tip  
Network Loop 2 Ring  
Ground  
9
R
10  
11  
12  
GND  
T
Customer Loop 2 Tip  
Customer Loop 2 Ring  
R
5. HDSL4 DEPLOYMENT GUIDELINES  
Refer to the H4TU-C Installation and Maintenance Practice, HDSL4 Deployment Guidelines section, for loop  
parameters including attenuation and loop resistance considerations.  
NOTE  
The H4TU-C with part numbers 1221401L6, 1221403L6, and 1221404L6 support  
only one 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.  
6
61223445L1-5D  
 
     
6. H4R CAPACITY GUIDELINES  
The ADTRAN 239 H4R is designed for installation in a prewired apparatus case, and the capacity guidelines for deployment are defined in Table 3 and  
Table 4. These housing capacity numbers are based upon testing results.  
Table 4. 239 H4R Capacity Guidelines for ADTRAN Housings  
Recommended Slot  
H4R Capacity  
Assignments  
Part  
Number  
Description  
CLEI Code  
Slots  
Stub  
Material  
Above  
Below  
Above  
Below  
Ground  
Ground  
Ground  
Ground  
1150027L1  
1150027L2  
1150057L1  
1150057L1  
1150058L1  
1150058L2  
239/439 Housing  
239/439 Housing  
Universal Housing  
Universal Housing  
Universal Housing  
Universal Housing  
DDMOABA1MA  
DDMOBBA1MA  
DDMODA01RA  
DDMODA01RA  
DDMOEE01RA  
DDMOFE01RA  
4
4
4
4
8
8
Air  
Gel  
Air  
Gel  
Air  
Gel  
4
4
4
4
8
8
4
4
4
4
8
8
All  
All  
All  
All  
All  
All  
All  
All  
All  
All  
All  
All  
Stainless/Polymer  
Stainless/Polymer  
Stainless Steel  
Stainless Steel  
Stainless Steel  
Stainless Steel  
 
   
Table 5. 239 H4R Capacity Guidelines for Other Housings  
H4R Capacity Recommended Slot Assignments  
Manufacturer’s Part  
Number  
Manufacturer  
Description  
Slots  
Material  
Above  
Ground Ground  
Below  
Above Ground  
Below Ground  
ADC  
Radiator II  
Radiator  
SPX-HRXC-30-AG-016GT  
SPX-HRXC-30-B1  
760005  
16  
8
16  
8
16  
8
All  
All  
All  
All  
All  
All  
Stainless Steel  
Stainless Steel  
Stainless Steel  
Stainless Steel  
Polymer  
ADC  
Circa Telecom  
Circa Telecom  
HDSL-12A  
HDSL-12B  
12  
12  
12  
12  
12  
8
12  
All  
760006  
12  
All  
Keptel® Inter  
Link809  
Arris/Lucent/  
AT&T  
RF809A3-XXX or  
RF809B3-XXX  
N/A  
1, 3, 4, 6  
7, 9, 10, 12  
N/A  
Keptel® Inter  
Link818/819  
Arris/Lucent/  
AT&T  
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  
Arris  
Keptel Inter  
Link 819 Fam-  
ily  
AT819B1U or  
AT819A1U  
12  
8
8
2, 3, 5, 6, 8, 9,  
11, 12  
2, 3, 5, 6, 8, 9,  
11, 12  
Polymer  
Polymer  
Arris/Lucent/  
AT&T  
Keptel Inter  
Link 820 Fam-  
ily  
RF820AX or  
RF820BX  
2 to 8  
Full  
Full  
All  
All  
* For 16 slot use, the ambient air temperature measured 1 foot away and parallel to the housing should not exceed 115°F (46.1°C).  
 
 
239 H4R Installation and Maintenance Practice  
Front Panel LEDs  
7. FRONT PANEL LEDS  
The ADTRAN 239 H4R provides front panel LEDs to display status information. See Table 6 for a listing of the  
front panel LEDs and their indications.  
Table 6. Front Panel LEDs  
Unit  
Label  
Indication  
Description  
LP1/LP2  
NET  
! Off  
No span power is present  
239 H4R  
" Solid Green  
Synchronized with an Signal to Noise Ratio (SNR) margin greater than  
the recommended SNR Margin Alarm Threshold  
1223445L1  
4 Fast Flashing Green  
(Flashing 3 times per second) Attempting to synchronize with the  
H4TU-C  
4 Slow Flashing Green (Flashing once per second) Synchronized with a SNR margin greater  
than the recommended SNR Margin Alarm Threshold, and the attenua-  
tion is greater than the user recommended Loop Attenuation Alarm  
Threshold  
LP1  
NET  
LP2  
LP1  
CUST  
LP2  
" Solid Yellow  
Synchronized with a SNR margin greater than 0 dB but less than the  
recommended SNR Margin Alarm Threshold  
LL RL  
/
(Y) (G)  
4 Flashing Yellow  
Synchronized with a SNR margin greater than 0 dB but less than the  
recommended SNR Margin Alarm Threshold, and the attenuation is  
greater than the user recommended Loop Attenuation Alarm Threshold  
" Solid Red  
Synchronized with a SNR margin of 0 dB  
4 Flashing Red  
(Flashing once per second) Synchronized with a SNR margin of 0 dB,  
and the attenuation is greater than the recommended Loop Attenuation  
Alarm Threshold  
LP1/LP2  
CUST  
! Off  
No span power is present  
" Solid Green  
Synchronized with an Signal to Noise Ratio (SNR) margin greater than  
the recommended SNR Margin Alarm Threshold  
4 Fast Flashing Green  
(Flashing 3 times per second) Attempting to synchronize with the  
H4TU-R  
4 Slow Flashing Green (Flashing once per second) Synchronized with a SNR margin greater  
than the recommended SNR Margin Alarm Threshold, and the attenua-  
tion is greater than the user recommended Loop Attenuation Alarm  
Threshold  
" Solid Yellow  
Synchronized with a SNR margin greater than 0 dB but less than the  
recommended SNR Margin Alarm Threshold  
4 Flashing Yellow  
Synchronized with a SNR margin greater than 0 dB but less than the  
recommended SNR Margin Alarm Threshold, and the attenuation is  
greater than the user recommended Loop Attenuation Alarm Threshold  
" Solid Red  
Synchronized with a SNR margin of 0 dB  
4 Flashing Red  
(Flashing once per second) Synchronized with a SNR margin of 0 dB,  
and the attenuation is greater than the recommended Loop Attenuation  
Alarm Threshold  
LL/RL  
" Solid Yellow  
4 Flashing Yellow  
" Solid Green  
Indicates that a loopback is active at the H4R towards the H4TU-C  
H4R is armed but not in loopback  
Indicates that a loopback is active at the H4R towards the H4TU-R  
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9
 
   
Maintenance  
239 H4R Installation and Maintenance Practice  
8. MAINTENANCE  
The HDSL4 239 T1 HDSL4 Repeater (H4R) requires no routine maintenance for normal operation. In case of  
equipment malfunction, perform an in-band loopback from the Central Office. If a malfunction is confirmed,  
replace the unit.  
The ADTRAN 239 H4R has looping capability through the channel allowing digital loopback in fault isolation.  
The loopback is activated remotely. The type of loopbacks the H4R supports will be dependent upon the loopback  
capabilities of the transceiver units utilized on the circuit. Refer to the Installation and Maintenance Practice of the  
specific H4TU-C or H4TU-R for a list of loopback codes.  
Performance monitoring, diagnostics, and loopbacks are also available from the craft interface at the  
H4TU-C or H4TU-R.  
CAUTION  
When testing indicates a faulty H4R, refer to the housing Installation and Mainte-  
nance Practice for the entry and pressurization control, the replace the faulty unit.  
ADTRAN does not recommend that repairs be attempted in the field. Repair services may be obtained by returning  
the defective unit to ADTRAN. Refer to “Appendix A, Warranty” for further information.  
9. SPECIFICATIONS  
Specifications for the HDSL4 239 T1 HDSL4 Repeater (H4R) are detailed in Table 7.  
10  
61223445L1-5D  
 
   
239 H4R Installation and Maintenance Practice  
Specifications  
Table 7. 239 T1 HDSL4 Repeater (H4R) Specifications  
Specification Description  
Loop Interface  
Modulation Type: 16 TC PAM  
Mode: Full Duplex, Partially overlapped echo canceling  
Number of Pairs:  
2
Line Rate: 1.552 Mbps  
Baud Rate: 261.333 k baud  
Bridged Taps: Single Taps < 2000 ft., Total Taps < 2500 ft.  
Performance: Compliant with T1.418-2000 (HDSL4 Standard, Issue 2)  
H4TU-C Transmit Power (Data) Level: 14.1 ±0.5 dBm (0 to 400 kHz)  
H4TU-C Transmit Power (Activation) Level: 14.1 ±0.5 dBm (0 to 307 kHz)  
Input Impedance: 135 ohms  
Maximum Loop Resistance: Refer to “HDSL4 Deployment Guidelines” on page 6.  
Return Loss: 12 dB (50 kHz to 200 kHz)  
Power  
Tested with the ADTRAN H4TU-R (P/N 1223426L1) and H4R (P/N 1223445L1)  
H4R Input Power 5.0 watts (span powered by H4TU-C)  
Clock  
Clock Sources: DSX-1 Derived (with HDSL4 frame bit stuffing)  
Internal Clock Accuracy: ±25 ppm (Exceeds Stratum 4), Meets T1.101 Timing  
Requirements  
Tests  
Diagnostics: Loopback initiated with in-band codes or from H4TU-C or  
H4TU-R craft interface  
Physical  
239 Repeater, Apparatus Shelf-Mounted, Weight: < 1lb.  
Environment  
Standard Operating Temperature: –40ºC to +70ºC  
:Storage Temperature: –40ºC to +85ºC  
Compliance  
UL 60950  
NEBS Level 3 (SR-3580)  
FCC 47CFR Part 15, Class A  
Part Number  
239 T1 HDSL4 Repeater (H4R): 1223445L1  
61223445L1-5D  
11  
 
 
Specifications  
239 H4R Installation and Maintenance Practice  
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12  
61223445L1-5D  
 
Appendix A  
Warranty  
WARRANTY AND CUSTOMER SERVICE  
ADTRAN will replace or repair this product within the warranty period if it does not meet its published specifica-  
tions or fails while in service. Warranty information can be found at www.adtran.com/warranty.  
Refer to the following subsections for sales, 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 prior to returning equipment to ADTRAN.  
ADTRAN, Inc.  
CAPS Department  
901 Explorer Boulevard  
Huntsville, Alabama 35806-2807  
61223445L1-5D  
A-1  
 
                 
239 H4R Installation and Maintenance Practice  
®
A-2  
61223445L1-5D  
 

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