Cobalt Digital COMPASS 9220 Bidirectional ASI_MPTS Gateway - Manual (Page 54)

54 9220-UM V1.1
Admin Test Packet Generator Tab
The 9220 includes a Test Packet Generator (TPG) that is capable of generating a configurable
constant bit rate sequence of MPEG-2 Transport Packets with very strict timing. The TPG is
considered an input port, and is available to be connected to any output port. As with any input
in the 9220, it supports up to 8 connections. The user interface for the TPG is depicted below:
To configure the TPG, make your selections in the Modify Configuration area of the GUI, and
click on Apply Settings. The TPG configuration parameters are:
•
Mode: controls the type of MPEG-2 transport packets generated. The options are:
o Disabled: TPG is disabled. No packets are being generated.
o NULL Packets: TPG is generating NULL packets. If you select this option, the
PID parameter becomes read-only with the value 1FFF.
o Ramp48 Packets: TPG is generating packets with a “Ramp48 Payload”. A
“Ramp48 Payload” is composed of the bytes 0x48, 0x49, 0x4A, …, 0xFF.
Generated packets have the Payload bit set, no Adaptation Field, and a valid
Continuity Counter field. On request, Cobalt Digital Inc. can supply a test
program for Windows or Linux that receives the Ramp48 packets and checks
them.
o PCR Packets: TPG is generating packets with a valid PCR field (stamped
corresponding to the packet’s departure time at the configured bit rate). The
packets have a small payload with random data, so the Continuity Counter field is
valid and counting.
•
PID (hex): controls the PID of the generated packets. This is specified in hexadecimal.
•
Bit Rate (bps): controls the bit rate of the generated packets. The minimum value is
64,000 bps and the maximum value is 213,000,000 bps.