Maintenance Architecture
555-233-143
1-8
Issue 1 May 2002
Power Interruptions
System cabinets and their associated power supplies can be powered by
110/208 Volts AC either directly or from an uninterruptible power supply (UPS)
system. Alternatively, the cabinets and their power supplies may be powered by a
-48 VDC battery power plant, which requires DC-to-DC conversion power units in
the system.
If power is interrupted to a DC-powered cabinet or an AC-powered cabinet without
optional backup batteries, the effect depends upon the decay time of the power
distribution unit. If the interruption period is shorter than the decay time, there is
no effect on service, though some -48V circuits may experience some impact. If
the decay time is exceeded for an EPN, all service to that port network is dropped,
and the EPN must be reset when power is restored If the EPN contains a switch
node carrier, all service to port networks connected to that switch node is
dropped.
Single-carrier cabinets, which can be used for EPNs, also have no battery
backup. If power is interrupted for more than 0.25 seconds, all service is dropped
and emergency transfer is invoked for the EPN.
In the above cases, the cabinet losing power is unable to log any alarms.
However, in the case of an EPN going down while a server remains up, alarms
associated with the EPN are reported by the system.
Nominal Power Holdover
AC-powered multicarrier cabinets are equipped with an internal battery that is
powered by its own charger and that provides a short-term holdover to protect the
system against brief power interruptions. This feature, known as the nominal
power holdover, is optional on cabinets supplied by a UPS and required on every
other AC-powered cabinet. The battery is controlled in such a manner that it
automatically provides power to the cabinet if the AC service fails. The duration of
the holdover varies according to the cabinet’s administration. See
duration times.
Содержание S8700 Series
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Страница 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Страница 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Страница 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Страница 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Страница 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...
Страница 1121: ...CARR POW Carrier Power Supply Issue 1 May 2002 8 399 555 233 143 Figure 8 19 Power Distribution Unit J58890CH 1 ...
Страница 1447: ...E DIG RES TN800 reserve slot Issue 1 May 2002 8 725 555 233 143 E DIG RES TN800 reserve slot See ASAI RES ...
Страница 1735: ...LGATE AJ Issue 1 May 2002 8 1013 555 233 143 LGATE AJ See BRI SET LGATE BD See BRI BD LGATE PT See BRI PT ...
Страница 1846: ...Maintenance Object Repair Procedures 555 233 143 8 1124 Issue 1 May 2002 Figure 8 62 TN787 MMI MULTIMEDIA INTERFACE CIRCUIT PACK ...