Knox Video RS8x8HB User Manual
Page 3
KNOX VIDEO
RS8x8HB ROUTING SWITCHER
KNOX VIDEO
RS8x8HB ROUTING SWITCHER
Page 1
Page 2
1.1 INTRODUCTION
The RS8x8HB routing switcher is a device which accepts up to eight video
inputs and up to eight stereo audio inputs (that is, eight channels of left and right
audio), and connects any one of the input channels (buffered electrically) to one or
more of the eight outputs.
1.2 TECHNICAL DESCRIPTION
The RS8x8HB uses a single chip microprocessor with backup battery to drive
three monolithic latching crosspoint decoders, one for video and one for each
channel of audio. The video channel features a driver stage with a gain of two to
drive a 75 ohm coaxial line. The audio is set up for high impedance unbalanced
inputs and outputs with a gain of one, or optional 600 ~ balanced inputs and
outputs at up to +16dB.
Crosspoint information is collected by the microprocessor from either the front
panel push-button switches or from the RS232 port on the rear panel, and distributed
to the crosspoint decoders. Audio and video may be routed together or separately.
The microprocessor program activates an automatic lamp test at powerup or when
requested on the RS232 port. Each time a routing command is received, the current
routing map can be reported on the RS232 port.
1.3 DETAIL SPECIFICATIONS
Video Channels
Levels: 1 v. composite picture video or black burst: with a variety of
line resolutions including 525,625,825,875, and 1025, with a
variety of television systems including NTSC, PAL, SECAM
and others.
Frequency Response:
DC to 200MHz
@ 300mv; <-3dB @ 150MHz
@ 1.0v,<-3dB@ 115MHz
Input Impedance:
75 ohm
Output Impedance:
75 ohm
Crosstalk:
all hostile:
Typ <-70dB @ 5MHz
Typ <-55dB @ 20MHz
Typ <-25dB @ 100MHz
one hostile:
<-40dB @ 200 MHz
Audio Channels, Unbalanced
Levels:
2 V. unbalanced audio
Frequency Response:
20Hz to 30KHz
Input Impedance:
100Kohm
Output Impedance:
1Kohm
Crosstalk:
less than -85db © 1 KHz
Audio Channels, Balanced
Hum and noise:
<-90dB
Frequency Response:
20Hz to 50K Hz ± ¼dB
Level:
0, 4, or 16dB, clipping at 18dB
Impedance:
Bridging, or 600 ohms termination
Crosstalk:
<-90dB @ 20K Hz
General
Connectors-Video:
(16) BNC or RCA (if specified)
Connectors-Audio:
Unbalanced: (32) RCA
Balanced: Phoenix screwtype,
removable
Power Consumption:
nominal 15 vdc, .75A (from plug-in
module supplied)
Power Connector:
5mm/2mm coaxial
Dimensions:
3U rack
19” wide x 5.25” high x 2” deep
Shipping Weight:
5 pounds
SECTION 1. GENERAL INFORMATION