The ATM Camera V2 is a high performance ATM peripheral for the digitization of live audio and video directly into ATM cell streams. The device is highly pipelined and thus exhibits a very low latency.
Two variants of the ATM Camera V2 are expected to exist. One will be the standalone AVA200, and the other will be modified for direct connection to the Fairisle switch fabric for use in Desk Area Network applications.
The AVA200 version is designed for desktop use and is housed in an
attractive custom designed box shown in Figure 1. The
unit has 3 physical video channels and 3 audio channels. One of the
video connectors is usually an SVHS connector and the other two are
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BNC connectors, although any combination of these inputs is
possible. The SVHS connector has separate luminance and chrominance
inputs giving much better picture quality and should be used where a
high quality video source is available.
The audio connectors are 3.5mm stereo jacks with the left channel
connected to the tip as per most audio standards. All audio inputs
are nominally line level , although Audio
input 1 may be configured to accept microphone level signals
.
The AVA200 network interface is ATM Forum standard 100Mbps or 140Mbps TAXI over optical fibre, whereas the DAN variant has the standard 96-way Fairisle backplane connector allowing direct connection to the DAN. The simplification of the ATM interface makes the DAN version cheaper to produce.
The unit has 5 LEDs on the front panel. From the left these are:
The rear panel contains an RS232C serial line over which diagnostics
are output. A simple debugging monitor may also be accessed via this
interface. The use of this interface is described in
Section 6. The power switch is also located on the rear
panel. The other connectors are an 8-pin mini-DIN for the external power
supply, and an auxiliary connector which provides power and an
bus for controlling peripherals such as camera pan/tilt mounts
.
Figure 2: ATM Camera V2 Major Datapaths (DAN variant).