
ArcLight Hub User’s Guide
General System Description
Rev. 001
1081006
1-9
reference input and creates a phased-locked 93 MHz clock that is
distributed to all CDC cards in the ABS chassis.
The Chassis Health Monitor (CHM) monitors both the active and
standby System Controller’s “heartbeat” signal. If the CHM detects a
loss of heartbeat from the active System Controller over the EIA-232
bus, it initiates a System Controller failover. This operation switches
system control over to the standby System Controller/UC pair, and
reboots the previously active System Controller allowing operations to
continue. The previously designated active System Controller now
becomes the standby System Controller.
The CHM also monitors the power supply (PS) Failure signals directly,
and Power Supply voltages, chassis temperature, and Blower/Fan RPM.
The System Controller queries the CHM for this information, and then
sends the Power Supply voltages and chassis temperature values to the
NMS. If a Power Supply fails, or the Blower/Fan RPM goes to zero, a
trap is set to alert the NMS operator.
The transmit side of the hub hardware is provided by the FLM. The
FLM interfaces to a TCP/IP network via Ethernet. On the satellite
network side, packets are formatted and transmitted over the satellite
network to VMTs.
The PCMAHC (VPCMA-70) contains the components necessary to allow
outbound and inbound satellite signals to operate in the same satellite
bandwidth. The unit interfaces with digital satellite modems using a 70
MHz IF. The VPCMA-70 may be operated remotely using user-provided
SNMP Manager Application software loaded on a computer that is
connected to the Ethernet connector on the rear panel. If the Hub
system network uses two transponders a VPCMA-70 and an Up/Down
Converter are not necessary in the system configuration.
Access to and from the Internet or company intranet is through an
enterprise policy router and switch with 100 base T interfaces. The
default address plan for an ArcLight Hub system network is illustrated
in Figure 1-5.
.
Figure 1-5. ArcLight Hub System Network.
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