Leds, Clock lock, Inter-frame communication – Grass Valley NV5256 v.1.8 User Manual
Page 33: Terminators, 10base2, Ethernet, Clock lock inter-frame communication, 10base2 ethernet, Detail
NV5256 Machine Control Router • User’s Guide
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3. Detail
Terminators
LEDs
Three leds are on the front of the card. Their name and functionality are as follows:
A red ‘serial link error’ LED is in the center of the card. This LED indicates whether the frame
TDM link is invalid (has data bit errors).
Clock Lock
For the expanded router to operate correctly, the frames must be “clock-locked” to each other. The
following is a list of ways to accomplish the clock locked frames.
1 Supply an AES reference to both frames.
2 Connect the primary AES reference output on the master frame to the primary AES reference
input of the slave frame. If you have a redundant expansion card, connect the secondary AES
reference output of the master frame to the second AES reference input of the slave frame.
The video reference does not lock the cards.
If the frames are not clock-locked, data errors will occur when the router uses ports across video
frame boundaries.
Inter-Frame Communication
The expansion connections transport machine control data.
Additionally, the two frames must communicate with each other. Connect one 10Base2 connector
on the master frame, with 50
Ω coaxial cable, to a 10Base2 connector on the slave frame. Place a
50
Ω terminator on each unused 10Base2 connector.
Terminators
10Base2
The NV5256 ships with two 50
Ω terminators for each frame. The terminators are required for an
expanded router.
S
In older routers, termination for a stand-alone router is required. In newer routers, it is not.
If you have an expanded router, use terminators as described under
Ethernet
The NV5256 ships with 1 Ethernet terminator for each router control card. These terminators are
required if you do not use Ethernet (for example, if you are using a third-party router control sys-
Name
Function
Alarm
Indicates when the serial link is not error-free or the P.S. is bad.
Active
Indicates the card is healthy and supplying the Frame TDM stream to the frame.
Health
Indicates Good power, Good Serial link, FPGA loaded