Network Electronics SDI-IP-GTW, User Manual

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SDI-IP-GTW User Manual
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4 Equipment Description
4.1 Introduction
This chapter provides an overview of transmission of SDI data over IP
networks and a high-level functional description of the SDI-IP-GTW.
4.2 Functional Description
4.2.1 Introduction
The SDI-IP-GTW consists of a main module and 1 SDI module with one
SDI input connector and three SDI output connectors. Optical Gigabit
is provided as a hardware option.
The SDI-IP-GTW can be configured by the operator to be IP transmitter
or an IP receiver. In the IP transmitter mode, the SDI-IP-GTW
encapsulates SDI streams received on the SDI input port into IP
streams. The stream is sent on an Ethernet interface onto the IP
network.
In IP receive mode, the SDI-IP-GTW receives and de-capsulates a single
SDI stream from the IP network and outputs the stream on the SDI
output ports.
4.2.2 IP Transmit Mode
The SDI-IP-GTW is able to handle SDI signals on the following formats:
•
ANSI/SMPTE 259M-1997
The sourced SDI stream is then processed by the Main board. The SDI-
IP-GTW will encapsulate the SDI data according to Pro-MPEG forum
Code of Practice #4 and transmit the data over the IP network.
The SDI-IP-GTW handles both unicast and multicast transmissions.
4.2.3 IP Receive Mode
In IP receive mode, the SDI-IP-GTW receives IP packets from the data
Ethernet interface. In the case of unicast, the SDI-IP-GTW will parse
the IP stream and send the transport stream to the SDI output if the
data maches the configured UDP port. In case of multicast, the SDI-IP-
GTW will send a join message to join the configured multicast. When
reception is disabled, the SDI-IP-GTW will send a leave message to the
network.
For the SDI stream, the received line data are held in a frame buffer.
The function of this buffer is to handle re-ordering of packets, eliminate
network jitter and support the adaptive rate recovery.
After clock recovery, the SDI stream is passed to the SDI output port.