The
network control module (NCM) is the core module of the HIRS frame. At the same
time, as a relatively independent unit, its CPU system is connected downward to
an NIM port through an RS422 for the communication with other boards of the
system to implement monitoring of the whole system. Its performance directly
affects the HIRS and the whole system. For this reason, active/standby
configuration is employed for it. In addition, error locating and automatic
recovery technologies have been adopted in the design, and various factors such
as thermal design and electromagnetic compatibility design have been taken into
consideration from the selection of components to PCB arrangement, so as to
ensure the stable and reliable working of the module
Basic Structure
and Functions of NCM
U gateway
unit: Implements
dual-bus mediation and routing between the present frame and outgoing data.
ATM
interface unit: Implements interconnection of inter-frame data, and provides
interfaces for future expansion.
Main control
unit: The CPU
system, which implements dispatching of various modules’ software and
configuration information; local device status modification notification and
confirmation; maintenance of configuration database local copy; detection,
isolation, reporting and recovery of HIRS network errors; HIRS network
performance monitoring; reception of TOD broadcast data, control and maintenance
of GPSR (GPS receiver); as well as operation and maintenance of the BSS system.
Clock power
supply reset unit: Feeds the boards, and provides 1.5V supply to the back plane;
clock driving and dispatching; board reset.
Main control
logic unit: Implements active/standby competition and switchover, in-board
status detection, control and reporting.
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