PESA Cheetah 1024x256, Руководство пользователя

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C
HEETAH
S
ERIES
S
WITCHERS
– C
HAPTER
2
81-9059-0570-0 Rev. C
Proprietary Information of PESA S
WITCHING
S
YSTEMS
, I
NC
. 2
Chapter 2: Introduction
2.1 C
HEETAH
P
RODUCT
O
VERVIEW
The Cheetah series switchers are full-featured video matrix switchers capable of handling Serial Digital
Interface (SDI) and High-Definition Television (HDTV), as well as other non-standard digital signals,
in the same frame. Copper and optional fiber input and output modules provide for maximum
flexibility.
2.2 C
HEETAH
S
WITCHERS
A
NALOG
S
UPPORT
Additionally, PESA Switching Systems, Inc. offers analog cards for the Cheetah series switchers, which
will allow users to maintain legacy equipment during the transition to digital or single-ended, general
purpose NTSC video transmission applications such as video data for telemetry, radar, surveillance,
high-level TTL video switching, and 75
Ω
audio. The analog inputs can accept signals from DC to the –
3dB roll-off at 50 MHZ with voltages up to ±2V standard and ±5V for high level.
To maximize the analog offering for the Cheetah series, all frame sizes (64x64, 128x128, 256x256,
256x448 flexi-frame, 512x512, and 1024x256) will accept analog matrix and I/O cards. Excluding the
64x64 frame, Cheetah system configurations will allow partitioning for both analog and digital cards to
reside in the same frame in blocks of 64x64. The 64x64 frame can be configured for either all digital or
all analog only.
The following types of analog I/O cards are available:
•
Basic analog input cards, output cards, and matrix cards with maximum bandwidths of 50 MHz
•
Analog input cards and an output cards for high-level signals to support telemetry or other types
of sine wave signals with voltage levels to a maximum of 5V p-p.
Basic analog output cards and the High-Level cards will accept the optional dual-output, piggyback
cards.
The frame architecture for the analog model uses common components from sister HD/SD frames, thus
allowing for easy future migration to full digital. Power supplies and matrix control cards are the same
for Cheetah analog versions.
Due to the architecture used for the digital frames, analog-switching
characteristics that require critical timing may be affected. Mixed length
interconnect cabling internal to the frame could cause differential delays to
exceed ±4º @ 4.43 MHz on frames larger than 256x.
Due to termination requirements, partially populated frames may need to
have at least one analog matrix dummy-load card installed.
Additionally, analog matrix frames will not support Video Output
Monitoring options.