Model 5601MSC
Model 5601MSC Master SPG/Master Clock System
OVERVIEW Revision 2.2 Page - 1
1. OVERVIEW
Figure 1-1: Front View of the 5601MSC
The 5601MSC Master Sync and Clock is both a broadcast quality master sync pulse generator (SPG)
and a master clock. It provides all of the synchronizing signals needed in a 21st century TV station or
post production facility at the same time as solving the problem of locking the in-house master clock
system to the master video sync pulse generator.
A high stability, temperature controlled oscillator provides the 5601MSC with better than 5.0x10
-9
(or
0.005ppm) frequency reference. The free-running drift of this oscillator will be less than 0.1Hz (which
amounts to less than 1 millisecond time drift per day). This guarantees that any frequency drift, with
time and temperature, will be within the tolerances expected from the best SPGs or master clocks
available in the industry. The 5601MSC may also be referenced to an external 5MHz or 10MHz master
oscillator if higher stability is required. Both the SPG and the Master Clock sections may be referenced
to high stability time and frequency standards present in the Global Position System (GPS) by adding
the GP option.
The SPG section provides six independently programmable sync outputs. These six BNC outputs may
be configured to provide independently timed color black (black burst) outputs or independently timed
HDTV tri-level sync outputs, or pulses or subcarriers. Each color black output can optionally carry
Vertical Interval Time Code (VITC) on a user specified set of lines. Additionally, there are many more
sync modes available for each output. The wordclock output provides a 48kHz wordclock or may be
configured as an additional sync output. The 10MHz output provides 10MHz or 5MHz, or may be
configured as an additional sync output.
When referenced to the optional GPS receiver, the start of the NTSC four field sequence and the PAL
eight field sequence will coincide with a specific point in GPS time. In this way, by referencing multiple
5601MSCs in a system to GPS, they will all be locked to each other in all standards. This is ideal for
applications requiring a remote facility to be phase and time locked. The GPS head may be remotely
located from the unit with the standard weatherproof 50 ft. cable included or optional 100 ft. and 400 ft.
cables. For remote GPS head requirements of greater than 400 ft. or for fiber optic isolation, GPS Data
Fiber Transmitters & Receivers are also available (7707GPS-DT, 7707GPS-DR).
The system clock may be synchronized to GPS time (GP option), to the LTC input, to extracted VITC
from the reference input, or to another 5601MSC through a syncro link. With the T option it can also
synchronize once daily to a remote SNTP server. With the IRIG option the system clock may also be
synchronized to incoming IRIG-B timecode. When a modem module is installed (M option), the system
clock is able to synchronize to a dial-up high-accuracy time source via modem. A battery backed-up
real time clock maintains time while the unit is without power.
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