NVision NV8288, User Manual, Page: 24 / 86

14 Rev 1.3 • 21 Oct 08
2. Introduction
Module Slots and Rear Connectors
For instructions on making diagnostic connections, see Making Diagnostic Connections on
page 41.
Figure 2-12. Permanent Diagnostic Connections (Rear View)
Video Reference
The NV8288 and the NV8288-Plus provide timing reference connections for video signals, labeled
‘VIDEO REF 1’ and ‘VIDEO REF 2’, as shown in Figure 2-13 on page 14. Located on the rear of
the router, these connections provide a reference input for determining the router’s video frame
switch point. The video reference connections require a stable source of PAL, NTSC or Tri-level
sync.
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 performs the switch, but to an internal reference. If a video
reference is not connected, the control card displays a lit red LED. (See
Indicator LEDs on
page 56.) For instructions on making video reference connections, see Making Video Reference
Connections on page 43.
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 fails-over to the redundant reference. When
using different references, or “dual” references, switch takes can occur based on one or the other
reference. For example, if ‘VIDEO REF 1’ uses NTSC as a reference and ‘VIDEO REF 2’ uses
PAL as a reference. Using UniConfig, the type of setting is selected: redundant or dual, and if dual,
which outputs reference which video reference on an output by output basis. (See the
UniConfig
User’s Guide .)
Figure 2-13. Connections to Video References (Rear View)
System Alarm
The NV8288 and the NV8288-Plus provide a system alarm that sends notification a malfunction,
such as when a fan or power supply is not functioning properly. The NV6257 (power supply) and
the NV8288 each have alarm connections that can be connected to external equipment that display
visual signals when an alarm is activated. Creation of an external alarm indicator is outside the
RTR EXPANSION
E146905
10/100 BT
10/100 BT RTR EXPANSION
VIDEO
REF 1
LOOP
VIDEO
REF 2
LOOP
AUX 1
AUX 2
CTRL 1
CTRL 1
CTRL 2
CTRL 2 ALARMS
POWER SUPPLY
MONITORS
POWER INPUT
TIME
CODE
PRI
CTRL
SEC
CTRL
PRI CTRL
SEC CTRL
DIAG (38.4 Kbaud)
DIAG (38.4 Kbaud)
Diagnostic
Connections
RTR EXPANSION
E146905
10/100 BT
10/100 BT RTR EXPANSION
VIDEO
REF 1
LOOP
VIDEO
REF 2
LOOP
AUX 1
AUX 2
CTRL 1
CTRL 1
CTRL 2
CTRL 2 ALARMS
POWER SUPPLY
MONITORS
POWER INPUT
TIME
CODE
PRI
CTRL
SEC
CTRL
PRI CTRL
SEC CTRL
DIAG (38.4 Kbaud)
DIAG (38.4 Kbaud)
Video Reference
Connectors