
Red
MAX
™
Subscriber Modem
SU-O User Manual
70-00057-01-01-DRAFT
Proprietary Redline Communications © 2007
September
7,
2007
Page 19 of 55
Real-Time Polling Service (rt-PS)
The base station schedules a continuous regular series of transmit opportunities for the
subscriber to send variable size data packets. The grant size is based on the current data
transfer requirement. Typical applications include streaming MPEG video or VOIP with
silence suppression. This is efficient for applications that have a real-time component and
continuously changing bandwidth requirements.
Non-Real-Time Polling Service (nrt-PS)
The base station schedules regular transmit opportunities for the subscriber to send
variable size data packets. Typical applications may include high bandwidth FTP. The
polling period may typically be one second or less, even during periods of network
congestion.
Best Effort (BE)
The base station schedules transmit opportunities for the subscriber to send traffic based
on unused bandwidth after all higher level traffic scheduling requirements are serviced.
Typical applications may include Internet access and email. Best effort service flows can
be assigned a priority of 0 to 7.
Unsolicited Grant Service (UGS)
The base station schedules a continuous series of transmit opportunities for the subscriber
to send fixed size data packets. This schedule supports real-time applications including
VoIP or TDM transport. The UGS pre-scheduled grants guarantee reserved bandwidth
and reduce latency introduced by repetitive grant requests. The service flow will not
transmit packets larger than nominal grant interval.
2.3.4 Downlink Service Flow Scheduling
The base station schedules downlink traffic on active service flows based on the
minimum reserved data rate (CIR), traffic priority, and maximum latency.