11 Technical Appendix
11.8.28 VSG181 - Video Sync Generator
The VSG181 is used as a video signal reference for studio equipment and provides the generated signals at
four BNC outputs. These are 1x Bi-Level Sync (Black Burst)/Tri-Level-Sync, 1x Longitudinal Time and Control
Code (LTC), 1x Digital Audio Out (DARS), and 1x Word Clock
In order to be able to provide high-precision output signals during the switchover of the RSC (IMS systems
with redundant receivers), the VSG181 has its own oscillator.
Features
The VSG181 is synchronized with an external reference frequency (10 MHz), a pulse per second (1PPS) and a
time telegram of the preconnected reference. These signals significantly determine the accuracy of the output
signals. All output signals can be configured extensively and individually via the web interface. The generated
signals have a phase reference to the 1PPS.
Black Burst Output
Output Signal:
PAL, NTSC Black Burst
with VITC Support or
Tri-Level-Sync
Signal level:
300 mV
pp
into 75
Ω
(unbalanced)
Formats:
Black Burst:
PAL (SMPTE259M/ITU-R BT.470-6)
NTSC (SMPTE170M/ITU-R BT.470-7)
VITC (SMPTE12M-1/SMPTE ST309M)
Tri-Level-Sync:
720p50 Hz (SMPTE296M3)
1080i25 Hz (SMPTE274M6)
720p59.94 Hz (SMPTE296M1)
1080i29.97 Hz (SMPTE274M7)
LTC Output
Signal:
LTC
Signal level:
TTL, 2.5 V
pp
(MARK/SPACE) into 75
Ω
Formats:
25 fps, 23,98 fps, 29,97 fps,
29,97 fps Drop Frame
VSG
A
B
LTC Out
DARS Out
W
ord Clk Out
Black Out
181
IMS - LANTIME M4000
Date: 27th May 2021
155