JVC Professional APRIL 2007 NAB-2007 The ProHD Report
Copyright 2007 JVC Professional Products Company All rights reserved Page 28 of 43
Is WiMAX suitable for HD ENG? Most certainly, but there are many issues to be
covered before the WiMAX backhaul becomes an every-day event. The bottom line
question is the required bitrate for the backhaul, and, at 20Mbps, ProHD is the most
attractive professional HD compression scheme for WiMAX applications. But even
at 20Mbps, the ENG backhaul would occupy a rather large part of the total WiMAX
bandwidth probably requiring using the licensed WiMAX band for real-time
guaranteed performance. Therefore, the 2GHz and 7GHz BAS bands currently used
by the TV broadcasters are likely to be the most practical solution for HD ENG
wireless backhaul for several years to come.
Fiber-wired IP backhaul
“Dark” fiber-optic cable is generally available criss-crossing metropolitan areas all
over North America, which can be leased and “lit” for cost effective backhaul of HD
ENG and HD POV (Point-of-View) cameras.
Fig. 13. HD ENG backhaul over private IP network from ENG Van to
TV station, utilizing ASI-to-IP Gateway (T-VIPS TVG420), using either
wired or wireless connection from ProHD camcorder to ENG Van.
IEEE-1394
(MPEG-2 TS
20Mbps) Microwave TX
& Modulator
JVC
GY-HD250U
ASI Input
ASI Output
BMS Microwave
Diversity RX
WIRELESS or WIRED + IP Gatewa
y
ASI
ASI
100Base-T or Gi
g
-E
IP Network
ASI-to-IP
Video Gateway
TV Station