Grass Valley NV5256 v.1.8 - Manual (Page 23)

NV5256 Machine Control Router • User’s Guide 15
3. Detail
Connections
S In older routers, stand-alone termination is required. In newer routers, it is not. In an older sys-
tem, place 50
Ω terminators on both connectors.
In any expanded router, place 50 Ω terminators on unused 10Base2 connectors.
Aux Bus
At the middle left portion of the rear of the NV5256 frame are 2 ‘NVISION Aux Bus’ (BNC) con-
nectors:
If you are using an SMS7000 router control system with the NV5256, connect the SMS7000 to the
NVISION Aux Bus (a.k.a. Node Bus) connector.
The NV5256 has two aux bus connections. The connection is loop-through: you can pass the
SMS7000 “node bus” control signals on to another device if it is required. You can connect a
redundant control system on the “node bus.”
If you are using an SMS7000 control system, terminate the “node bus” with 75 Ω terminators.
S Using an SMS7000 requires an SMS7000 mezzanine card installed on each router control card.
Jumpers J4 and J6 must be set. See
Jumpers , page 26, for detail.
Video Reference
At the lower left portion of the rear of the NV5256 frame are 4 Video Reference (BNC) connectors:
The NV5256 provides video reference connections ‘VIDEO REF 1’ and ‘VIDEO REF 2’. These
connections allow you to synchronize port switches with a video frame’s switch point. The video
reference can be NTSC, PAL, or tri-level sync.
S Tri-level sync is not supported on older EM0374 control cards.
At least one video reference connection must be connected. Otherwise, the control card’s front red
LED remains lit and takes will not occur at defined switch points.
Redundant Reference
There are two video reference connections. You can use the reference connectors in 2 ways:
• Single reference.
• Redundant reference.
NVISION
AUX BUS
10/100 BT 10/100 BT
LOOP
THRU
5- 5-8 5-8 5-8 5-8 5-8 5-8 5-8 5-8 5-8 5-8 Aux Bus
VIDEO
REF 1
VIDEO
REF 2
LOOP
THRU
(2)
9-1 9-12 9-12 9-12 9-12 9-12 9-12 9-12 9-12 9-12 9-12
Video
Reference