DS3 F
IBER
L
OOP
C
ONVERTER
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DS3 Fiber Loop Converter
Description
The DS3 Fiber Loop Converter (DS3 FLC) is an alternative to high bit-rate DS3 multi-
plexers, allowing an economical last mile DS3 transport or a point of presence hand off.
The DS3 FLC is a plug and play system that can be configured to maximize facilities
utilized for point-to-point or point-to-multipoint topologies and can be optioned for 1:1
protection. The DS3 FLC supports the following applications:
• DS3 Hicaps
• DS3 Point of Presence (POP) Hand-off
• DS3 Video Transport
• DS3 ATM Transport
The DS3 FLC is a single, modular system. All functions are integrated onto a single
printed circuit board. The modular system eliminates common equipment, reduces
spare inventory costs and simplifies circuit provisioning and installation. Unlike M1/3
multiplexers, there is better utilization for transporting a clear channel DS3. A maxi-
mum of four protected systems or eight unprotected systems can be hubbed out of one
universal eight position rack mount chassis.
The DS3 FLC can be installed anywhere in the network: a central office (CO), a con-
trolled environmental vault (CEV), a hut, an outside plant cabinet, or at the customer
premises. The same DS3 FLC module is interchangeable for the central office terminal
and remote terminal and for either working or protect channels. One module fits all
locations and applications making troubleshooting easy and keeping spare inventory
costs to a minimum.

Provides system flexibility and the ability to deploy both DS3 and DS1 services from a single chassis
• End-to-end performance testing with front panel alarm and LED status
Simplifies turn-up and troubleshooting
Features and
Benefits
Applications
The DS3 FLC is transparent to DS3 frame or format; clear channel DS3
hicaps are a reality. Whether the DS3 is DS2 channelized or a single DS3
rate video channel, the DS3 FLC will transport the signal intact.
The DS3 FLC uses SONET multiplexing techniques to provide a
smooth transition to SONET networks. The DS3 is mapped
using the industry standard (TR-TSY-00253) mapping of a
DS3 into an STS-1.
DS3
SERVING CENTRAL OFFICE
DSX
OR
DDP*
DCS
VIDEO
CODEC
DS3
FLC
DS3
HICAP
DS3
POP
DS3
FLC
DS3

ROUTER
DS3
FLC
PCPC
PC
E-MAIL SERVER
HOSTFILE
SERVER
DS3
FLC
DSX,
DCS
OR
DDP
Applications
DS3
SERVING CENTRAL OFFICE
DS3
FLC
SUBSCRIBER NETWORK INTERFACE
CPE
DSX
OR
DDP*
SMDS
SWITCH
DS3
FLC
DS3
FLC

• Provides performance monitoring
The DS3 FLC transports information over optics
to the SMDS switch
in the serving
central office. The
DS1 QFLC can be
used for transport of
SMDS service at the
1.5 Mbps network
interface.
*ADC DIGITAL DISTRIBUTION POINT
Switched
Multimegabit Data
Service (SMDS)
Application
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DS3 Fiber Loop Converter
DS3 Video Distance
Learning Applications
CENTRAL OFFICE
8 POSITION UNIVERSAL
HORIZONTAL MOUNTING SHELF
SCHOOL #3
SCHOOL #1
SCHOOL #2
D
S
3
F

3
F
L
C
P
OPTICAL
BUDGET
= 13 dB
Video
CODEC
TWO POSITION
RACK MOUNT
DS3
VIDEO
SIGNAL
110V
AC
110V
AC
Q
F
L
C
W
8 POSITION UNIVERSAL
HORIZONTAL MOUNTING SHELF
T1
Multiplexer
AC/DC
converter

W
Q
F
L
C
W
D
S
3
F
L
C
W
Video
CODEC
Video
CODEC
T1
Multiplexer
Distance learning provides an effective use of an educator's time and allows a specialist's
expertise to be shared across a larger audience as well as the ability to share resources
between institutions and offer a broader curriculum to the student body. The DS3 FLC
provides high quality video signal transmission that is the most cost-effective solution
for DS3 video transport.
DS3 ATM
Applications
DS3
NNI
SERVING OFFICE
DEMARCATION POINT