150-431-115-01, Revision 01
Appendix E - Product Support
HLU-431 List 1E
September 22, 1998
53
A
PPENDIX
E - P
RODUCT
S
UPPORT
This section contains product support and warranty information.
T
ECHNICAL
S
UPPORT
PairGain Technical Assistance is available 24 hours a day, 7 days a week by contacting PairGain Customer
Service Engineering group at:
During normal business hours (8:00 AM to 5:00 PM, Pacific Time, Monday through Friday, excluding holidays),
technical assistance calls are normally answered directly by a Customer Service Engineer. At other times, a
request for technical assistance is handled by an on-duty Customer Service Engineer through a callback process.
This process normally results in a callback within 30 minutes of initiating the request.
In addition, PairGain maintains a computer bulletin board system for obtaining current information on PairGain
products, product troubleshooting tips and aids, accessing helpful utilities, and for posting requests or questions.
This system is available 24-hours a day by calling (714) 730-2800. Transmission speeds up to 28.8 kbps are
supported with a character format of 8-N-1.
Table 17.
HiGain Doubler Deployment Matrix
Maximum Number of Doublers Per Circuit
a
HDU-451, List 3, 3B, 4, 4B
HDU-437, 439
HDU-404, 407, 409
Line Powered
Local Powered
Line Powered
Local Powered
Line Powered
Local Powered
HLU Model
CPEI ON
CPEI OFF
CPEI ON
CPEI OFF
CPEI ON
CPEI OFF
CPEI ON
CPEI OFF
CPEI ON
CPEI OFF
CPEI ON
CPEI OFF
HLU-231
List 6X;
HLU-232
List 1D
1
1
2
2
1
1
2
2
1
2
2
2
HLU-319
List 2X;
HLU-388
List 2X
1
1
2
2
1
1
2
2
1
2
2
2
HLU-231,
List 7X;
HLU-431,
List 1D and 1E
1
1
2
2
1
2
b
2
2
1
2
2
2
HLU-231,
List 8X;
HLU-319,
List 5X;
HLU-388
List 5X
1
2
2
1
2
2
2
2
3
c
2
4
d
a HRU-411 applications with CPEI are limited to single doubler circuits (HDU-404, HDU-407 or HDU-409). The HRU-412,
HDU-451, HDU-437 and HDU-439 are limited to applications with one and two doublers only.
b 2000 ohm maximum loop resistance. Requires HRU-412 List 7A or 8A, or HUR-402 or HUR 411.
c Requires HRU-402 or 411.
d Requires HRU-402.
Telephone:
(800) 638-0031 or (714) 832-9922
Fax:
(714) 832-9924