Tài liệu QUAD FIBER LOOP CONVERTER AND MOUNTING CHASSIS docx

Q
UAD
F
IBER
L
OOP
C
ONVERTER
AND
M
OUNTING
C
HASSIS
The Quad Fiber Loop
Converter System from
ADC. The T1/E1 Service
Delivery Experts
QFLC Module and Wall Mount Chassis
2-Position Rack Mount Chassis
QFLC and Mounting Chassiss
437 10/97 Original © 1997 ADC Telecommunications, Inc. All Rights Reserved An Equal Opportunity Employer
Description
ADC has designed a family of Fiber Loop Converters (FLCs) that provides a cost-effective
alternative to deploying service over copper while avoiding the high capital investment of
DS3 fiber optic terminals. This family includes products designed for economical distri-
bution of single or multiple DS1s.
The Quad FLC multiplexes up to four T1s for transport over two fibers at distances of 16
to 20 miles (26 to
33 km). The QFLC system consists of a rack mounted central office chassis and a wall
mounted customer premises chassis. In contrast to M12/M13 fiber optic terminal sys-
tems (FOTS), which require a variety of modules to start up operation, the QFLC mod-

ule is a stand-alone system and does not require additional plug-in equipment.
The QFLC was designed to be installed quickly. Plug, play and walk away installation is a
reality with the QFLC. Extensive, built-in self-test circuitry allows the QFLC to isolate
module failures and alert maintenance personnel via standard office alarms.
The optional microprocessor unit (MPU), residing in the 8 position rack mount chassis,
collects alarm information from all remote and local QFLC modules for connection to
alarm surveillance equipment with a Telemetry Byte Oriented Serial Interface (TBOS).
The QFLC supports 1+1 redundancy to protect against single point failures of both opti-
cal facilities or electronic equipment. The QFLC features two sets of bit error rate (BER)
threshold select switches. These switches enable the user to select the BER at which the
module will 1) declare a minor alarm to indicate that the BER has exceeded an early
warning level and 2) initiate protection switching in a system configured in a protect
mode. The BER threshold at which protection switching occurs may be set according to
the performance levels guaranteed to your customers.
All of ADC’s FLC products feature the option to provide 60 mA simplex current, which
can be turned on and off by the user depending on the needs of a particular installation.
This feature allows the QFLC to supply span current on a DS1 output to power channel
service units (CSUs) or
• Chassis supports optical hubs and is compatible with ADC’s entire FLC family of O/E products
Mechanical housing can accommodate a wide variety of plug-in modules. From single DS1 to multiple DS1s,
or mixing DS1s with DS3s, the chassis provides a broad platform from which new services can be delivered.
A variety of high capacity circuits can now be distributed from a single chassis.
• Single module system
No need to inventory different working and protect modules, or different near and far-end modules. One part
number does it all, reducing investment in spare inventory and simplifying circuit provisioning and installa
tion.
• Optional 1+1 redundancy
Protection against fiber facility or equipment failures. Unprotected circuits can be upgraded later to provide
protection, thereby lowering the initial cost of installation.
• Dual selectable BER threshold setting

Provides selectable BER thresholds for protection switching and early warning minor alarm. Switching and
minor alarm levels can be set according to service requirements.
• 60 mA simplex current on DS1 outputs
Provides span power on an as needed basis for powering network interface devices or channel service units.
This eliminates the need for most span powering repeaters at the customer premises, saving money and
installation time.
Features and
Benefits
QFLC and Mounting Chassiss
437 10/97 Original © 1997 ADC Telecommunications, Inc. All Rights Reserved An Equal Opportunity Employer
Features and
Benefits
(cont'd)
• Remote (far-end) alarms can be displayed locally
Simplifies trouble diagnostics and allows single-ended trouble shooting. This reduces field dispatches and
improves responsiveness to potential service interruption.
• Remote housekeeping alarm transport
Housekeeping alarm inputs provide monitoring of external equipment at the remote site, such as fire and door
alarms. Reduces investment in external alarm reporting systems.
• Individual DS1 remote loop back capability
Allows single-ended testing of each DS1 link to aid in trouble sectionalization.
• Redundant AC power converters at customer premises
Two AC/DC converters are available in the wall mount chassis to ensure that service is not interrupted if a
supply should fail.
For an enterprise in today’s highly competitive world, communications and the ability to
effectively manage information are seen as strategic components in developing and
maintaining a competitive edge. Growing demands for faster service, more features and
higher quality mean that service providers must design a migration strategy for their
networks that not only addresses today’s needs but also anticipates tomorrow’s.
The Quad Fiber Loop Converter provides a solid foundation for future products and

services. By installing the chassis at a central location, service providers can support
multiple customers in a variety of applications. Since the chassis supports all FLC
modules, including the DS3 FLC, modules can be mixed or matched depending on
service requirements. Described on the following pages are several applications which
take advantage of the flexibility in the Fiber Loop Converter sys-
tem.
HUT
BUILDING
HIGH RISE
BUSINESS PARK
POINT-TO-
MULTIPOINT
CENTRAL
OFFICE
Hut
REH
REMOTE
PEDESTAL
REH
REMOTE
PEDESTAL
• Optional wall mount battery back-up
Provides a minimum of 8 hours back-up in the event of commercial power failure, ensuring uninterrupted
service.
QFLC and Mounting Chassiss
437 10/97 Original © 1997 ADC Telecommunications, Inc. All Rights Reserved An Equal Opportunity Employer
For an enterprise in today’s highly competitive world, communications and the ability
to effectively manage information are seen as strategic components in developing and
maintaining a competitive edge. Growing demands for faster service, more features and
higher quality mean that service providers must design a migration strategy for their

networks that not only addresses today’s needs but also anticipates tomorrow’s.
The Quad Fiber Loop Converter provides a solid foundation for future products and
services. By installing the chassis at a central location, service providers can support
multiple customers in a variety of applications. Since the chassis supports all FLC
modules, including the DS3 FLC, modules can be mixed or matched depending on
service requirements. Described on the following pages are several applications which
take advantage of the flexibility in the Fiber Loop Converter system.
HUT
BUILDING
HIGH RISE
BUSINESS PARK
POINT-TO-
MULTIPOINT
CENTRAL
OFFICE
Hut
REH
REMOTE
PEDESTAL
REH
REMOTE
PEDESTAL
Applications
Point-to-
Multipoint
Providing fiber-based DS1 services in urban applications requires low first cost installa-
tion and the capability to serve multiple customer locations. By placing the rack mount
chassis in the central office, up to eight different customer locations can be served from
a single platform. Service turn-up is fast, as one plug-in part number is all you need,
whether the service is 1:1 protected or unprotected.

CENTRAL
OFFICE
POINT-TO-
MULTIPOINT
DS1
ELECTRICAL
CENTRAL OFFICE
DSX FDPQFLC
OFFICE BUILDING
OFFICE BUILDING
OFFICE BUILDING
QFLC
N
I
D
QFLC
N
I
D
QFLC
N
I
D
OFFICE BUILDING
QFLC
N
I
D
QFLC and Mounting Chassiss
437 10/97 Original © 1997 ADC Telecommunications, Inc. All Rights Reserved An Equal Opportunity Employer

Remote
Pedestals
As fiber deployment extends into the loop, remote pedestals and cabinets are being fed
with fiber optic cable from a hut or central office. The QFLC is ideal for this application,
providing up to 8 DS1s in a 4" chassis, well-suited for a digital loop carrier system.
CENTRAL
OFFICE
HUT
REH
REMOTE
PEDESTAL
REH
REMOTE
PEDESTAL
To Central
Exchange
Remote
Pedestal
Hut
1 - 240
Homes
•
•
•
E1
Electrical
QFLCDDF FDP
1 - 240
Homes
•

•
•
FOT
QFLC
ICX
Remote
Pedestal
QFLC
ICX
Suburban
Business Parks
With the installation of an eight position rack mount shelf in a CO or CEV, a service
provider can support multiple customers, each of which would have a wall or rack
mount chassis on their premises. The QFLC allows the service provider to take advan-
tage of any unused fiber already terminated at the building premises, thereby providing
T1 service in the most economical means possible. By using the span power option on
the QFLC, the service provider can eliminate the need for an additional office or span
repeater to power the customer’s equipment. As the customer’s service requirements
become more critical, the service provider can install an additional QFLC on each end of
the link to fully protect the system.
CENTRAL
OFFICE
HUT
BUSINESS PARK
WAREHOUSE
TO
CENTRAL
OFFICE
DS1
ELECTRICAL

HUT
FOT DSX FDPQFLC
OFFICE BUILDING
FACTORY
QFLC QFLCQFLC