363-206-305
Technical Specifications
10-56
Issue 3 June 2000
Underwriters Laboratories (
UL
)
10
The DDM-2000 FiberReach Multiplexer is
UL
listed for restricted access
installations in business and customer premises applications installed in
accordance with Articles 110-16 and 110-17 of the
National Electric Code
*
,
ANSI
/
NFPA Number 70-87. Other installations exempt from the requirements of the
National Electric Code
may be engineered according to the accepted practices of
the local telecommunications utility.
Canadian Standards Association
10
The DDM-2000 FiberReach Multiplexer has been certified by the Canadian
Standards Association per standard C22.2, Number 225-M90.
Power Requirements
10
Shelf Fuses
10
Up to four
−
48 V feeders (A and B) are required for each DDM-2000 FiberReach
shelf. Each shelf power is protected by 3-amp fuses provided with the shelf.
Power Dissipation
10
Table 10-25 lists the power dissipation and current drains for the listed
configurations for the wideband shelf. The maximum current drain can be
calculated for any configuration by dividing the total power dissipation by 40 V (the
minimum battery voltage).
When reviewing Table 10-25, the following items should be noted:
■
The DDM-2000 FiberReach wideband shelf accommodates two
−
48 V
power feeders ("A" and "B" office power feeders). The DDM-2000
FiberReach narrowband shelf has two
−
48 V power feeds.
■
Loss of one power feeder does not cause a loss of service.
■
All supply voltages other than
−
48V required by the system are generated
by DC-to-DC converters within the system.
■
The system meets all performance requirements when the DC input
voltage varies between
−
40.0 V and
−
60.0 V.
■
The system tolerates DC input voltages between 0 V and
−
60 V without
damage.
■
The system complies with electrical noise tolerance requirements in
Section 13.2 of TR-TSY-000499.
† Registered trademark of Underwriters Laboratories Inc.
* Registered trademark of the National Fire Protection Association, Inc.
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