Product manual

Configuration directions, Limitations of the system
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
5
Fig. 2 Back-up time
Powering recommendation when using a battery power unit
When using a system with more than one battery power unit, for instance four modular cabinets and
two battery power units, ensure that the modular cabinet with the CPU board contains at least a
minimum system configuration. This means that besides the CPU board this cabinet must at least
contain the following boards:
• One SLU board. Instead of the SLU board, an SPU or SPU-S board and a CLU or CLU-S board
can be used.
• One DTU or LTU board
A minimum configuration in one modular cabinet ensures that, if the batteries have become flat after
a power failure, the system powers up correctly when the mains becomes available again.
To leave enough power to charge these batteries the load from the modular cabinets(s) should not
exceed 240 W.
Base stations
In worst case situations a minimum number of base stations can be powered via a single cabinet as
mentioned above. Whether, in a given situation, more base stations can be connected depends on
the cable lengths used. Paragraph
5.3 describes the powering options for the BS330 and BS340 type
base stations.
When base stations are powered by local adapters, centralized power, or via the cabinet by an external
source (for example a PBX), the number of base stations is limited to 248 when using CPU2 and 120
when using its predecessor CPU. Furthermore the external source specifications can limit the
maximum number of base stations.
Number of cordless phones
The number of cordless phones, when subdivided into digital or analogue PBX interfaces, directly
relates to the number of DTUs with CAS firmware and LTUs. A DTU with CAS firmware can interface
0
2
4
6
8
10
12
14
0 30 60 90 120 150 180 210 240
Load (W)
Back-up tme (hours)
027