C
HEETAH
S
ERIES
S
WITCHERS
–
C
HAPTER
11
81-9059-0570-0
Rev. C
Proprietary Information of
PESA
S
WITCHING
S
YSTEMS
,
I
NC
.
173
11.9.9
House Synchronization Input Connectors
These BNC coaxial connectors, illustrated in Figure 87, provide the interface for two, house (analog
only) synchronization signals (i.e., NTSC, PAL, 1080i, 1080P, and 720P only). Each house sync
input is a pair of BNC connectors wired in parallel (1 and 3 are a pair; 2 and 4 are a pair). The
paralleling of these connectors allows the synchronization signal to be daisy-chained from one routing
switcher to another.
ALARM
SY STEM CO NTROL
ALARM
NETWORK
OUTPUT
MONITOR
AUX FRAME CTRL
SLOT B
3
S LOT A
1
4
2
FRAME
ALARM
FRAME
CONTRO
L
SYSTEM
CONTROL
PRC
LOOP
COM
4
COM 3 / PRC
COM 1
COM
2
RCP P ANEL PORT
4
3
2
1
REFERENCE
1
2
3
4
REFERENCE
1
2
(3)
(4)
FIGURE 87: House Sync Input Connectors
Using the Cheetah GUI, the user can assign a specific reference signal for the system or individual
chassis that is used as a synchronization signal for specific output synchronized switching. Once the
output has been switched, the output signal remains synchronized to the initial reference assignment
until it is switched again with a new reference assignment. An example of a synch assignment would
be as follows:
Reference 1 is connected to an NTSC synch signal source and Reference 2 is connected to a PAL
synch signal source. Using the GUI, the user assigns Reference 1 to outputs 6 through 10 and
Reference 2 to outputs 11 through 16 for a specific chassis.
References 1 and 2 should be connected to the house sync source with coaxial cable and standard
BNC connectors.
Install 75
Ω
terminators on all unused connectors. Do not allow these
connectors to float un-terminated.
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