Cheetah 64NEX, Руководство пользователя

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Cheetah 64NEX Digital Video Router
Publication 81-9059-0685-0, Rev. A
March 2011
Proprietary Information of PESA 4-15
4.9.7 Frame and System Alarm Connectors
The three-pin connectors, illustrated in Figure 4-16, provide an interface for an external,
customer-supplied frame and system control alarm. The Matrix Frame Controller determines
when a frame alarm condition is declared while the System controller determines when a system
alarm condition is declared. Alarm contact location is illustrated in Figure 4-17 on the next page.
This circuit acts as a switch to trigger an optional external alarm in the event of a
controller/system fault or failure. The alarm circuit supplies an electronic contact closure, but
does not provide a voltage to the external alarm. The customer-supplied external alarm circuit is
connected with a cable constructed as shown in Figure 4-17 (next page).
The Customer-supplied power input to this connector must not exceed
12VDC and the associated amperage must not exceed 10mA.
F
IGURE
4-16 Frame and System Control Alarm Connector
The Frame Control alarm is activated if any of the following matrix frame controller conditions
exist:
•
Detects a card (input, output, matrix, output monitor, power supply, or matrix frame
controller) with a temperature out of range (above 114 ºF)
•
Detects a fan’s voltage out of range
•
Detects a power supply’s voltage or current out of range. The voltage or current must be
out of range for three consecutive times before the Matrix Frame Controller will indicate
an alarm.
The System Control alarm is activated if any of the following system conditions exist:
•
Detects a system interrupt (i.e., a CPU failure/error, an address error, or an illegal
instruction)
•
Synchronization problem with dual system cards
•
The system configuration is not properly relayed to the dual system cards
•
Whenever the system software is being upgraded
(+)
(-)
S
F
RAME AND
S
YSTEM
C
ONTROL
A
LARM
C
ONNECTOR