SONET SDH Software
from NComm provides a complete software solution for the implementation
of a range of SONET SDH systems. It consists of a set of software modules
that perform span configuration, alarming, performance monitoring plus Automatic
Protection Switching. The SDH SONET software is completely data driven,
allowing operating mode, alarm timers, and thresholds to be configurable
on a static or run time basis. Additionally, NComm's SONET/SDH TMS device
driver mapping methodology permits potentially manydevice
drivers to appear as one virtual device to the SONET SDH
software. The suite includes 2 levels of ANSI-C Application Programming
Interfaces (APIs), encapsulating the details of SONET SDH operation and
the underlying hardware elements, and provides a clean integration to
the target system's operating environment.
SONET SDH Target
High Bandwidth Data Transport
VT-n - OC-n Multiplexing & De-multiplexing
Features of SONET SDH Software
"Off-the-shelf" SONET SDH interface software providing multiple
levels of functionality based on product application
Supports 1 to N STS-1 spans. Scaling upwards, several STS-1
spans can be multiplexed together to form OC-N's. Scaling downwards,
an STS-1 can be demuxed to up to 7 VT Groups with each group
containing either VT1.5's, VT2's VT3's, or VT6's.
Polymorphic Device Driver Mapping (PDDM) Methodology
allows support for many device drivers.
Provides full SONET SDH span maintenance and alarming support,
with configurable timers and thresholds for alarm detection,
loopback activation, and other span conditions.
Full support for SONET SDH Performance Monitoring per T1.231.
Supports user choice of SDH SONET framer, currently supports
generic SONET SDH framer, as well as driver support for LSI Logic Super Mapper and PMC-Sierra's Spectra-2488 & TUPP+622. Call
Runs with or without Real Time Operating System (RTOS) on
virtually any processor and host environment. Currently ported
to LINUX, VxWorks, OSE and Nucleus Plus.
The figure below illustrates
the TMS software module architecture. Each software component
performs specific functions that represent a part of the total
SONET SDH software solution. The SONET SDH-Software API is comprised
of a set of ANSI C functions and macros that encapsulate all
functionality and data of the SONET SDH Software. The API provides
a clean interface to the SONET SDH Software simplifying the integration
of the SONET SDH Software to the target application. The target
application is implemented on top of the SONET/SDH-Software API
layer, using the API to access all functionality provided by
The SONET/SDH Manager Module provide
the interface points for administering and configuring any of the
STS-1/OC-n spans being controlled by the SONET/SDH-Software. The
SONMM defines the line interface rate -
OC-1 thru OC-192, structure of the interface-line, path,
section & virtual tributaries and alarm conditions definable
per type of alarm and per structure of the interface. The SONMM
also communicates with the SONPMM for processing performance
The SONET SDH Performance
Monitoring Manager Module will collect performance
specified in ANSI T1.231. The SONPMM will collect performance
statistics for both the near end and far end of the SONET SDH
Interface. Performance data is collected for the past 24 hours
in 15 minute buckets plus summary information. In addition,
the PMMM supports collections of data locked to the time of day.
The SONPMM supports threshold-crossing alerts, when enabled,
the alerts will inform the application when a threshold has been
exceeded and take the appropriate action. The application can
retrieve performance information upon request to the SONPMM.
The SDH or SONET Framer
Driver and its associated
API provides the interface between the SONET SDH Software and the
SONET driver device. Hardware implementations of OC-n systems
and VT-n systems may involve various & mixed
devices that access different sub-levels of an OC or STS signal.
To accommodate this potential, the SONET SDH Software has a Polymorphic
Device Driver Mapping Methodology that permits many device drivers
to appear as one virtual device to the SONET SDH Software; this
methodology maintains a commonality in general device driver development.
The SONET SDH Driver API is comprised of a set of ANSI C functions
and macros that handle the interaction with the device driver.