Grass Valley CRSC v.3.2 - Manual (Page 142)

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Tutorials
Products
HD Video Routers
All of the “HD” routers are SWB (super wide band) routers: they support a wide range of SD and
HD bit rates and formats, from 10Mbps to 1.5Gbps. With the exception of the -NR routers, the
HD routers reclock at 143, 177, 270, 360, and 540Mb/s and 1.483 and 1.485Gb/s and bypass re-
clocking for other rates. Video references must be nominally 800mV p-p and bi-level or tri-level
in nature. The HD routers support DVB-ASI signals.
SD Video Routers
All of the “SD” routers support a wide range of SD serial data rates from 10Mb/s to 540MB/s.
With the exception of the -NR routers, the SD routers reclock at 143, 177, 270, 360, and 540Mb/s.
The SD routers support DVB-ASI signals.
NR Video Routers
The HD and SD routers are available in non-reclocking models, such as the CR1616-HD-NR and
CR3204-SD-NR. These models are less expensive than the models that have reclocking circuitry
and work well with relatively noise-free signals. The reclocking models give better performance
in noisy environments.
CQX Video Routers
These 1RU “clean and quiet” video routers switch 16 inputs to 2 “clean and quiet” outputs and 6
auxiliary outputs.
The CQX routers have two crosspoint matrices. The first crosspoint routes 16 normal inputs
either to an internal mixer or to the second crosspoint matrix.
The mixer has 2 channels. Each channel mixes two inputs and produces an internal “clean”
output. One of the inputs is the signal previously routed to that channel and the other input is
the signal that will be routed to that channel. The mixer produces the transition between the
previous input and the next input according to the transition type and transition rate currently
selected (at a control panel) for the router.
For the SD and HD CQX routers, each input supports video plus 16 embedded audio channels.
The mixer transitions both the video and the audio without artifacts.
The 3Gig router supports both level A and level B of the SMPTE 425M standard. The mixer transi-
tions signals of level A, at 1080p, video and audio without artifacts. It handles level B
— two
1080i signals in one stream — somewhat differently. It mixes the 16 audio channels of “link A”
(from the two inputs) but passes the 16 audio channels of link B (from the two inputs) through
to the output unmixed. “Link B” will undergo a cut transition with possible audio artifacts.
Although audio for Link B is not processed and undergoes a cut transition, video for Link B is
mixed according to the transition type and rate selected on the CQX control panel.
 The 3Gig routers do not accept level B’s 2×720p signals at present.
The second crosspoint matrix receives internal signals and produces the CQX outputs 1 and 2
and the 6 auxiliary outputs (which are normal outputs). A multiplexer selects either the clean
output or the emergency bypass input. The emergency bypass input is selected only when
power fails. (The multiplexer is controlled by a relay that switches to its relaxed position when
power fails.)
The router has 16 normal input BNCs, 2 bypass input BNCs, 2 CQX output BNCs, and 6 aux
output BNCs.