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THE C-DOT DSS FAMILY
Administrative Module (AM) performs system-level resource allocation and
processing function on a centralised basis. It performs all the memory and time
intensive call processing support functions and also administration and
maintenance functions. It communicates with the Base Module via the Central
Module. It supports the Input Output Module for providing man- machine interface.
It also supports the Alarm Display Panel for the audio-visual indication of faults in
the system.
Input Output Module (IOM) is a powerful duplex computer system that interfaces
various secondary storage devices like disk drives, cartridge tape drive and floppy
drive. It supports printers and upto 8 serial ports for video display units which are
used for man- machine communication interface. All the bulk data processing and
storage is done in this module.
Thus, a C-DOT DSS exchange, depending upon its size and application, consists of
Base Modules (maximum 32), Central Module, Administrative Module, Input
Output Module and Alarm Display Panel. The Base Modules can be remotely
located or co-located depending on the requirement.
2.5.
REMOTE SWITCH UNIT
Remote Switch Unit (RSU) is an integral part of C-DOT DSS architecture. In order
to realise a RSU, the normal BM can be modified for remoting with the host
exchange via 2 Mbps digital links. The number of 2 Mbps links between the Main
Exchange and RSU is primarily determined by the traffic. A maximum 16 PCMs
can be provided between a RSU & Main exchange. Analog and Digital trunk
interfaces are also implemented in RSU to support direct parenting of small
exchanges from RSU itself instead of parenting it to the main exchange which will
ultimately save the media required from main exchange. As far as call processing is
concerned, RSU is an autonomous exchange capable of local-call completion.
Operation and maintenance functions are handled by the host exchange. In the
event of failure of PCM links, RSU goes into standalone mode of operation. In case
it is not possible to process a call request due to unavailability of links to the host,
the subscriber is connected to appropriate tone or announcement.
During standalone mode of operation, the local and Incoming terminating calls in
RSU are switched and the metering information of all the RSU subscribers is stored
in the RSU. It is sent to the host whenever the PCM links are available again.
Only the even numbered BMs can be configured as RSU i.e. a maximum 16 RSUs
are possible in C-DOT DSS MAX-XL and 8 RSUs in MAX-L.
MAINTENANCE PROCEDURES
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