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LTPH-SM-1014-03, Issue 3
To avoid complex calculations, use the following simplified power and fan requirements.
•
If PairGain/ADC components are used and no CPE power is required, the Wideband 3190 chassis can power
up to 12 doublers without necessitating the use of fans. (Recommended components include the HLU-319
List 5, HDU-409, and HRU-402.)
•
Chassis configurations that do not use doublers do not require the use of fans. However, NEBS requirements
may restrict the installation to four chassis per rack if no fans are used.
A/B P
S
OWER
OURCES
Each chassis requires one A battery feed and one B battery feed rated at a maximum of 30A total for fully loaded
chassis assemblies capable of driving a full complement of doublers and remote units.
The A/B power feeds provide total backup power for the HXU, HMU, and HFA cards. The HMU, HXU, and
optional HFA have diode-ORed power feeds.
For the HMS-358 List 1 chassis, the line units are powered as a split feed with half of the line units on each battery
feed. A loss of one battery feed forces 14 lines out of service. This reduces the maximum current required per
battery feed for systems with the maximum number of doublers.
For the HMS-358 List 2 chassis, the line units are powered from the backplane through diode-ORed power feeds.
A loss of one power feed will not affect service.
F
USES
System fuses are located in an external fuse tray typically mounted at the top of the CO rack. The HMU reports
all fuse alarms within the HMS-358. Each chassis within the rack must be equipped with A and B fuses for proper
power protection. Depending upon the system configuration, fuse ratings can vary from 5A to 20A. See
on page 91
for fuse selection information.
ADC does not recommend configurations in excess of 30 total per shelf.
To determine the power requirements of a CO rack, use the guidelines in the following tables:
•
Table 20 on page 91
used in a network.
•
Table 18
shows the power requirements of the common equipment needed for a protected HMS-357.
•
Table 19
combines this information into the system power requirements for each configuration. Although the
power requirements of the system can vary greatly depending on the line makeup, in practice the line makeup
seldom requires more than 30% of the lines to have doublers. With this type of provisioning, power
limitations due to CO heating is seldom a factor.
HMS-358 List 1 and List 2
describes the power requirements of various line configurations (A through F) typically
January 12, 2001
Appendix A - System Specifications
Table 21
89
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