Installation and Maintenance Manual Nimbra 300 Series
Product Overview
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©2006 Net Insight AB, All rights reserved
Note:
In order to comply with the EMC directives, unused
output ports must be terminated with a 75-ohm
termination plug.
(Two termination plugs are delivered together with the
ASI Transport module.)
ASI Transport Access Module (6 ports)
The ASI Transport Access Module provides simultaneous transport of up to four
(two in each direction) independent MPEG-2 Transport Streams (TS). The
capacity across the network of each transport channel can be configured to match
the actual size of the TS. The ASI board can handle MPEG-2 transport streams
between 2 – 200 Mbps.
The ASI Transport Access Module accepts and transmits MPEG-2 Transport
streams according to ISO/IEC 13818-1 (ITU-T H.222), with either 188 byte
packets or 204 byte packets. An ASI channel across the network can be unicast
to one receiving port or multicast to several receiving ports.
The board also has two monitoring ports. Each port can duplicate either the
incoming or outgoing signal of an in-out port pair. They can thus be used for
monitoring the incoming ASI stream or for duplicationg an outgoing stream (“bi-
casting”).
The ASI physical interface, Transmit and Receive, are female 75 Ohm,
connectors. To each port pair there is one monitoring port, also using a female
75 Ohm, BNC connectors. Each monitoring port can be configured via a switch
button on the front panel, to copy either incoming or outgoing data from its
in/out port pair. It can thus be used to either monitor that a correct signal arrives
to the in-port, or be used to copy the outgoing data, effectively providing a "bi-
casting" function on the outgoing signal.
Multicast is a way to transport data from one single source to many destinations
without any need to duplicate data on multiple channels. Each individual
destination point can either be network or source routed. They can furthermore
be dynamically added and deleted while a connection is still administratively up.
The front panel of the module is shown below.
Figure 16. Front panel
The module provides four video ports (two input and two output) and two
monitoring ports. Refer to chapter Specifications for data.
In normal operation the Power LED is lit and the Remove indicator LED is off.
The Request removal button is used when the Module should be replaced.
Status indicator LEDs provide information about the status of the respective
port. Refer to the Specifications chapter for more information about the
indicators.
The two Monitor select buttons are used to toggle the monitor ports between
incoming and outgoing streams.
To insert, connect or replace the ASI Transport module, refer to chapter
Hardware Maintenance.
