3257 HD
Series User’s Manual No: UM
-3257-D2
Page 4
2 INTRODUCTION
2.1 System Description
The 3257 HD Series is a Video / Audio / DVB-ASI fiber optic multiplexer. The 3257 Series
Video modules can be configured to transmit simplex or duplex video &
Audio and 1 to 4 DVB-ASI signals using WDM technology. Depending on the distance requirements
between sites, the 3257s may be equipped to operate over multimode or single mode fiber. Distances
between the transmitter and receiver can be up to 3 Km for multimode operation and up to 120 Km for
single mode operation
.
SYSTEM I/O CONFIGURATION
Each of the four ports can be configured for one of the following options:
Simplex Video and Simplex Audio
–
2 Channels
Simplex Video and Simplex Audio
–
4 Channels
Simplex Video and Simplex Audio
–
6 Channels
Simplex Video and Simplex Audio
–
8 Channels
DVB-ASI
–
1 to 4 channels
VIDEO / AUDIO TECHNOLOGY:
The 3257 system uses uncompressed 10 bit analog to digital modulation techniques which
provides excellent video quality. The audio circuitry also digitizes the audio signals prior
to transmission. The 2 channels of audio may be used for stereo audio or for two separate
channels of audio.
DVB-ASI Transmission Technology
The ASI option on the 3257HD series will accept any PCM 1Vp-p, 75 ohm
signal up to 600Mbps. The digital electrical signal connected to the BNC connectors is
converted to an optical signal. The ASI circuit’s receiver takes the incoming optical signal and
converts it back to electrical I/O: 75 Ohm up to 1Vp-p. The interface will NOT accept bipolar
signals, such as T1, T3, E1 or E3.
