SONET/SDH APS Software

(Automatic Protection Switching)

APS technology (Automatic Protection Switching) is one of the major benefits of SONET (Synchronous Optical Network) as well as SDH (Synchronous Digital Hierarchy). SONET/SDH. APS is well defined by standards in contrast to T and E carrier technologies where proprietary schemes are employed. NComm's APS software in the NComm TMS® family of telecom source code provides the necessary functionality to monitor each line as well as the control/switching over multiple lines. In it's first release, the Linear APS technology can be implemented in both the 1+1, 1:1 and 1:n architectures. Future releases of the APS software will address the needs of the ring APS models including Unidirectional Line Switched Ring (ULSR), Bidirectional Line Switched Ring (BLSR), Unidirectional Path Switched Ring (UPSR) and Bidirectional Path Switched Ring (BPSR) APS technology.

Target APS Software Applications

Self Healing protection functionality such as that found in SHNS (Self-Healing Network Service) and AccuRing
SONET/SDH Multiplexers
Class 5/4 Switches

APS Software Main Features

Full implementation of linear APS state machine
Designed to accommodate multiprocessor arrangements
Works across various hardware architectures
Built-in Wait-to-Restore feature
Models fully compliant with GR-253-CORE
SONET/SDH framer device independent

The NComm APS software implements controller and monitor blocks resulting in a totally flexible APS solution. It includes a fully implemented Linear APS state machine. The
modules have built-in bridge and selection control as well as complete transmission and acceptance of K1, K2 bytes. 1+1, 1:1 and 1:n (n = 1 to 14) systems are easy to build and
can be run time configurable. In conjunction with the SONET/SDH TMS software, Signal Fail and Signal Degrade with configurable hold-off times provide the foundation of the
APS switch triggers.

Wait-to-Restore (WTR) timers are also configurable with proper overrides for subsequent Signal Fail/Degrade indications.
Switch request priorities are fully operational as well as equal priority mediation. All switch commands are accessible including Clear, Lockout of Protection, Forced Switch of Working, Forced Switch of Protection, Manual Switch of Working and Manual Switch of Protection. The Exercise command is also supported. Control commands include Lockout of a Working Channel and Clear

APS Technology and Software Architecture

APS Software for linear aps technology

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