Nortel NT2H57UG Manuale utente
NT2H57UG 323-3221-291
Broadband Access & Video Networks
Video Codec Enclosure
(VCE)
Installation Manual
Standard Rel 1.0 July 1995
Installation Manual 323-3221-291 Rel 1.0 Standard
Broadband Access & Video Networks
Video Codec Enclosure
(VCE)
Installation Manual
1995 Northern Telecom
All rights reserved.
DV-45 is a trademark of Northern Telecom
Publication number: 323-3221-291
Product release: Rel 1.0
Publication status: Standard
PEC: NT2H57UG
Date: July 1995
Video Codec Enclosure (VCE) 323-3221-291 Rel 1.0 Standard
ii
Publication history
July 1995
Standard issue for general release.
Installation Manual 323-3221-291 Rel 1.0 Standard
iii
Contents
Introducing a VCE 1–1
What is a VCE? 1–1
Regulations 1–1
Physical characteristics 1–2
Cabinet weight 1–2
External dimensions 1–2
Cabinet cover 1–3
Mounting options 1–3
Alarm indicators 1–3
VCE components 1–3
DV-45 shelf 1–4
Power supply 1–4
Signal and power interface panel 1–5
Ordering VCE components 1–7
Ordering examples 1–7
Installing a VCE 2–1
Receiving a VCE 2–1
Locating a VCE 2–1
Mounting a VCE 2–2
Free-standing installation 2–3
Cabinet installation (Zone 4 earthquake) 2–5
Cabinet installation (wall mount) 2–10
Installing VCE components 3–1
Connecting DS3 carrier facilities to a DCS card 3–2
Connecting optical carrier facilities to a DMI-F45 3–4
Connecting optical carrier facilities to a DV-OC3 unit 3–6
Installing cards in a DV-45 shelf 3–11
Replacing a power supply 3–15
Observing safety guidelines 4–1
DV-45 shelf 4–1
DV-45 units 4–1
Handling units 4–2
Storing units 4–2
Installing or replacing units 4–2
iv
Contents
Video Codec Enclosure (VCE) 323-3221-291 Rel 1.0 Standard
Optical fibers 4–3
Laser radiation 4–3
Bending optical fibers 4–3
Handling optical fibers 4–3
Splicing optical fibers 4–4
Repairing optical fibers 4–4
Installation Manual 323-3221-291 Rel 1.0 Standard
1-1
Introducing a VCE 1-
This chapter introduces a video codec enclosure (VCE) in terms of:
• what it is
• the regulations used to manufacture it
• its physical characteristics
• its internal components
• ordering a VCE.
What is a VCE?
A video codec enclosure (VCE) is a low-cost cabinet used to house Northern
Telecom’s Digital Video Codec (DV-45) products.A typical application for a
VCE is Digital Video Learning Network (DVLN) applications and other
similar broadband products. The enclosure is spill proof and is cooled by
natural convection. The cabinet frame is supplied with an Oxford dark grey
(S-30497) finish and the cover is finished in light BTS dolphin grey (S-30480).
Regulations
AVCE meets all regulatory requirements for the Underwriters Laboratories
(UL), Canadian Standards Association (CSA), and the Federal
Communication Commission (FCC) when equipped with the standard
application configurations provided by Northern Telecom (Nortel).
CAUTION
Equipment within a VCE has been tested and found to comply
with the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the
equipment is operated in a commercial environment.
Equipment within a VCE generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference to
radio communications. Operation of equipment within a VCE in
a residential area is likely to cause harmful interference; users
will be required to correct the interference at their own expense.
1-2
Introducing a VCE
Video Codec Enclosure (VCE) 323-3221-291 Rel 1.0 Standard
In addition, when equipped with standard application configurations, a VCE
meets the following non-regulatory requirements:
• Earthquake Zone 4 upper floor—Bellcore NEBS TR-NWT-000063
• Office vibration—Bellcore NEBS TR-NWT-000063
• Transportation vibration—Bellcore NEBS TR-NWT-000063
• Drop test—Bellcore NEBS TR-NWT-000063
• Thermal performance—NT corporate standard 1524.00 and 1523.01
Physical characteristics
The physical characteristics of a VCE are presented in terms of its weight,
dimensions, mounting options, and external alarm indicators.
Cabinet weight
AVCE is mounted on a cardboard-protected, palletized platform for
transportation. A VCE weighs 134 lbs (61 kg) when empty. It can be
hand-trucked or hand-carried by two people to any location.
External dimensions
The overall dimensions of the unit (see Figure 1-1) are:
• Height 27 in. (689 mm)
• Width 24 in. (610 mm)
• Depth 24 in. (610 mm).
To provide access to the transversely-mounted equipment and to the
connections on the VCE, the enclosure should be mounted with 3 ft (914 mm)
clearance on the sides and front.
Figure 1-1
Cabinet dimensions
27 in.
(689 mm)
24 in.
(610 mm)
24 in.
(610 mm)
Introducing a VCE
1-3
Installation Manual 323-3221-291 Rel 1.0 Standard
Cabinet cover
Aone-piece, three-sided cover is used on a VCE.The cover is secured by four
hex-socket screws on the front of the VCE and is designed to slide completely
off of the unit. Slots are provided in the lower-rear corners of the cover to
facilitate removal with a standard screwdriver.
Mounting options
AVCE may be installed: free-standing on the floor; with an optional Floor
MountingKit (Zone 2to 4 earthquake);or with anoptionalWall Mounting Kit.
AVCE is equipped with integral leveling feet for free-standing installations.
Alarm indicators
No external alarm indicators are provided on a VCE to indicate the state of
equipment mounted within a VCE, except for the 120 Vac breaker; the breaker
state can be seen on the interface panel. To view any other indications on
equipment mounted within a VCE,
the cabinet cover must be removed.
VCE components
AVCE has the following internal components (see Figure 1-2):
• DV-45 shelf
• power supply
• signal and power interface panel.
Figure 1-2
VCE with cover removed
Power supply
Front Rear
Signal interface panel
(connectorized version)
DMI-F45 module
housing
DV-45 shelf
(rear)
Leveling foot Leveling foot
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
AVCE is provided with a 120 Vac/-48 Vdc 300W switch-mode power supply.
AVCE is delivered with a 10 ft (3.1 m) power cord that is prewired through
the interface plate. This is attached to a 7.5A 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, 15A
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
Indice
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