Grass Valley NV7512 v.1.3 - Manual (Page 29)

NV7512 Audio Router • User’s Guide 19
1. Introduction
Module Slots and Rear Connectors
If a video reference is present, signals switch at the defined frame and line switch points. If a video
reference is not present, the router still switches the signal, but to an internal reference. When the
video reference is not connected the control card red LEDs remain lit. (See
Indicator LEDs on
page 100.)
The video reference connections require a stable source of PAL, NTSC or Tri-level sync. For
instructions on making video reference connections, see
Video Reference on page 69.
Redundant and Dual References
There are two video reference connections. The same reference can be used for both connections or
a different reference for each connection. When using the same, or “redundant,” references for both
connections, if one reference fails, the control card automatically fails-over to the redundant refer-
ence. When using different references, or “dual” references, routing switch takes can be configured
to occur based on one or the other reference. For example, ‘VIDEO REF 1’ uses NTSC as a refer-
ence and ‘VIDEO REF 2’ uses PAL as a reference.
“Redundant” or “dual” mode is selected using UniConfig. If “dual” is selected, each output can be
configured individually to use ‘VIDEO REF 1’ or ‘VIDEO REF 2’ as the reference (see the Uni-
Config User’s Guide).
Figure 1-14. Connections to Video References (Rear View)
Alarm Connections
The NV7512 provides system alarms that notify you of a malfunction, such as when a fan or power
supply is not functioning properly. The NV6257 (power supply) and the NV7512 each have alarm
connections that can be connected to external equipment that display visual signals when an alarm
is activated. Creation of external monitoring equipment is outside the scope of this manual. How-
ever, basic instructions on wiring the alarm connections for external monitoring is provided. See
Alarm Indicator Equipment on page 72.
In addition to an alarm connection, the router control system receives status information from the
router’s control card(s). The control cards read the status of NV6257’s power supply and fans
through the ‘Power Supply Monitors’ connection. (See
Module Slots and Rear Connectors on
page 9.) At the same time, the control card monitors the local router’s power supply, fans, and
video reference connections. Both NV6257 and router information is then communicated to the
router control system and is viewable using UniConfig (see the UniConfig User’s Guide).
A SNMP agent can be installed on the router control system (i.e., NVISION 9000) to communicate
power supply information to a SNMP manager. Installation of SNMP agents and use of SNMP
managers is outside the scope of this User’s Guide.
Video Ref
Connections
VIDEO
REF 1
VIDEO
REF 2
LOOP
THRU