Cobalt Digital COMPASS 9284 3G_HD_SD-SDI 8X4 Video Routing Switch - Manual (Page 9)

9284-OM (V1.3) 9284 PRODUCT MANUAL 1-5
Introduction
9284 Functional Description
9284 Functional Description
Figure 1-1 shows a functional block diagram of the 9284. The 9284 video
routing switch accepts up to eight SDI inputs and routes these inputs to up to
four SDI outputs using DashBoard™ network remote control. All inputs are
equipped with cable equalizers (which can be enabled or disabled as desired).
All outputs are equipped with reclocking, which can independently be set for
auto reclock, format-specific reclock, or reclock turned off.
Source-to-destination routing is non-inverting, thereby allowing the card to
pass DVB-ASI signals.
The card switches on the correct line in the vertical blanking interval if a color
black reference is present at one of the two reference inputs on the rear of the
frame. (The reference and video formats must have the same frame rate or
have frame rates between the reference and video that have a ratio of either
1:2 or 2:1, i.e. 29.97 Hz frame rate reference with a video frame of 59.94 Hz.)
The switch point defaults to the mid line (50%) point and can be adjusted for
±2 lines or 1%-99% of the line.
Setup of routing and invoke of switching can be performed using
DashBoard™ remote control or via RS-232 commands from an external
router via Command String Protocol (see Serial Control Interface (p. 1-8) for
more information and command string definitions).
The 9284 provides the following inputs and outputs:
• Inputs:
•
IN 1 thru IN 8 – eight 3G/HD/SD-SDI BNC router source inputs
• Outputs:
•
(9284 only) OUT 1 thru OUT 4 – four 3G/HD/SD-SDI BNC router
destination outputs
A reference control interface allows selection of one of two external reference
signals
EXT REF 1, 2 from the frame-distributed reference bus. This interface
additionally allows selection of the frame rate and video format to ensure that
switching occurs during the proper point during the vertical blanking interval.
The VBI line at which switching occurs is user selectable.
Note: The reference is used by the 9284 to indicate the VBI point at which to per-
form switching (VBI portion as indicated by the reference signal). As such, the
SDI program material inputs are expected to be frame synchronized with the
reference.