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CXR Larus 80-100-400 Issue 2, July 2006 2-1
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.1 General
2.11
applications listed below apply to all versions of
the StarClock 200E system.
2.12
twork Interface requirements of ANSI/T1.101-1994 and
ITU-T G.703-1988.
2.13
and the Central Clock (BITS clock)
concept are presented in subsection 2.2.
2.14
rive their timing from an integral
Global Positioning System (GPS) receiver.
2 Applications
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2
Unless otherwise stated, the
The StarClock 200E Synchronization Timing System is intended for use in a
Digital Signal Level 1 (DS1) or European Standard CEPT E1 (Conference of
European Postal and Telecommunications Administrations protocol ITU-T
G.704) transmission environment. It is compatible with the Synchronization
Plan of Bellcore TA-NPL-000436 and AT&T PUB 60110, with the Timing Signal
Generator requirements of Bellcore TA-TSY-000378, and with the
Synchronization Ne
StarClock 200E provides timing for transmultiplexers, digital access and
crossconnect systems (DACSs), SONET (Synchronous Optical Network) or
SDH (Synchronous Digital Hierarchy) equipment, digital switches, channel
banks, and any other equipment requiring network synchronization. General
considerations of network timing distribution
Input timing may be derived from existing traffic-bearing DS1 or E1 framed
signals. StarClock 200E provides for two independent DS1/E1 inputs.
Additionally, the 54591 and 54593 cards de
NOTE:
The 54591 and 54593 GPS receivers normally require a rooftop antenna for dependable
reception and tracking of the GPS satellite signals. The antenna connector is located
on the rear of the STARCLOCK 200E mounting shelf. See Section 5.
Output signals are framed all ones at T1 or E1 rates and formats; 64/8 kHz
2.15
composite clock; 8 kHz, 1.544 MHz, or 2.048 MHz square wave; or 5/10 MHz.
2.16
support
system (OSS) and a local craft terminal for monitoring and control.
.17
Figures 2-1 through 2-4 depict the StarClock 200E system applications.
2.18
The StarClock 200E system can interface with a remote operation
2
Designing the location of master and slave terminals becomes difficult when
point-to-point circuits are used for add and drop services, switched services, or
services passing through certain customer multiplexing equipment. However,
reliable network timing can be achieved if one location is designated as the
master and Stratum 2/Transit Node Clock (TNC) or Stratum 3E/Local Node
Clock (LNC) clock systems are installed at all other sites. In ring systems, as is
