Nortel NT2H57UG, Руководство по установке

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1-4 Introducing a VCE
Video Codec Enclosure (VCE) 323-3221-291 Rel 1.0 Standard
DV-45 shelf
The DV-45 shelf has eleven slots for equipment. All cards are inserted into the
DV-45 shelf from the left side of the VCE (after the cover is removed).
A typical card configuration for a basic Digital Video Learning Network
(DVLN) room application is shown in Figure 1-3. The power supply is located
underneath the DV-45 shelf.
Figure 1-3
Typical DV-45 shelf configuration for a DVLN room application
Power supply
A VCE is provided with a 120 Vac/-48 Vdc 300W switch-mode power supply.
A VCE is delivered with a 10 ft (3.1 m) power cord that is prewired through
the interface plate. This is attached to a 7.5 A breaker on the interface plate
(see Figure 1-2 on page 1-3).
Note: If a VCE is bolted to the floor or wall, local electrical practices
specify that the flexible power cord must be replaced with a conduit or
armored cable entry and that the supply is connected to a 120 Vac, 15 A
power source with a double-pole breaker/isolator.
Power is distributed to the equipment in the DV-45 shelf through a distribution
board mounted on the right-rear panel.
No battery backup or location for a switch unit to provide backup power is
furnished with the standard configuration.
Note: If a DMI-F45 optical module is used, it is installed next to the power
supply (see Figure 1-2 on page 1-3).
Decoder
CAUTION
Decoder
Position #
Decoder Coder MCU
DCS
0 1 2 3 4 5 6 7 8 9 10
OC3