MPA-1212
Miniature ASI MPEG-2 Null Packet
Filter
WooshCom’s
MPEG Null Packet Filter reduces the
deluge of data that is produced from some single program transport stream (SPTS)
satellite receivers down to just the data of the selected program.
Some SPTS receivers bury the selected video steam, which may be as little as
4Mbps, in a flood of output data that is running at rates of 54 Mbps or
155 Mbps. The extra data packets are usually MPEG Null packets.
This can create a tremendous burden on
downstream equipment which must ingest this full flood of data. While many
pieces of headend equipment, like MPEG re-multiplexers, appear to handle the
extra data, there are others that have ingest rate limits that cannot be
exceeded.
If this data stream is directly converted
to IP and then transmitted onto a data network these unnecessary data packets
will needlessly consume network bandwidth and perhaps unnecessarily drive up
leased fiber line capacity requirements. This would result in
recurring monthly lease expenses that are needlessly high.
WOOSHCOM’S MPA-1212 ASI MPEG-2 Transport stream NULL
packet filter provides great flexibility in the control of NULL packets in the
transport stream. The device has one ASI input, (with an associated loop-thru
output) and two main mirrored ASI outputs which provide the filtered output
transport stream.
This MPA-1212 optimizes the use of bandwidth on an ASI connection by reducing
the number of MPEG NULL packets on its outputs down to the bare minimum. When
the fixed rate output option is selected, one of 126 pre-designated output rates
can be selected by the user in order to produce a constant rate
output transport stream even if the video content is variable bit rate in
nature. There are also options to strip out all NULL packets and to allow all
the incoming transport stream packets (including NULLs) to flow thru the device.
Some of its benefits:
 | Multiple methods for managing NULL packets |
| 126 pre-designated MPEG transport stream output rates
from 78 Kbps up to 213.7 Mbps. |
| Automatic NULL packet padding to produce constant
transport stream |
| Option to strip all NULL packets from stream |
| Option to pass all packets including NULLs |
| Operates at MPEG System layer - will pass MPEG-2 and
MPEG-4 elementary streams |
| Full MPEG PCR Correction |
| Dual ASI mirrored filtered outputs |
| ASI Loop-thru output for input signal |
| Install at ASI device - use no rack space |
| 1" x 4.3" x 2.25" & 6 oz. |
| ASI Rates up to 213.7 Mbps |
| All connections rugged and fully locking |
| Power multiple adapters from a single outlet |
| Easily configured for power redundancy |
