NEC Electra Elite 192, Hardware Manual

Page: 157 / 369

Electra Elite Issue 6
System Hardware Manual 5 - 11
3.1.6 Replacing Memory Backup
The CPUB( )-U10 ETU provides memory backup for
approximately 21 days. The Ni-Cad battery should be
replaced about every two years.
1. Remove the battery cable from CPUB( )-U10 ETU
CN4. Refer to
Figure 5-7 CPUB( )-U10 ETU .
2. Connect the cable from the new battery to CN4 on
the CPUB( )-U10 ETU.
3. Turn off the KSU power.
4. Remove the CPUB( )-U10 ETU from the slot in the
KSU.
5. Using a suitable cutting tool, cut the tie wrap and
remove the old the battery.
6. Fasten the new battery with a tie wrap.
7. Install the CPUB( )-U10 ETU again.
8. Turn on the KSU power.
3.2 CLKG-U10 Unit
3.2.1 Description
The CLKG-U10 Unit provides clock synchronization for
FT1 lines, ISDN-BRI lines, ISDN-PRI, and Wireless lines
that are connected to the system.
This unit works with the DTI-U10/20, BRT(4)-U10,
PRT(1)-U10/20, and BSU(2)-U10 ETUs and is
piggybacked on the CPUB ()-U10 ETU.