User's Manual
APPENDIX A: BACKHAUL REQUIREMENTS
©2005 IMobileNet, Inc. Revision & Copyright HSBS User Manual
516.80540.UM-Rev. D 1-Jun-07 Page 29 of 38
Serial Backhaul Capacity
The backhaul with the fastest speed that can provide clean, reliable, and dependable transmission should
be considered when dealing with backhaul capacity. IPMobileNet’s base stations operate at four (4) data
transmission rates, which include the following:
115,200 bps
57,600 bps
38,400 bps
19,200 bps
The optimal goal is to select a backhaul data rate that remains ahead of the base station’s data
transmittal. For example:
BASE STATION BACKHAUL RESULTS
19,200 bps or
32,000 bps
Anything less than
38,400 bps
Backhaul does not have the opportunity to remain
ahead of the base station’s transmittals if data
packets are dropped or need to be rebroadcast from
the IPNC to the base station.
19,200 bps or
32,000 bps
Anything higher than
38,400 bps
System will be more efficient and always operate at
the base station’s peak performance never waiting for
data to arrive from the IPNC.
64,000 bps 57,600 bps
Backhaul does not have the opportunity to remain
ahead of the base station’s transmittals if data
packets are dropped or need to be rebroadcast from
the IPNC to the base station.
64,000 bps 128,000 bps
Ideal rate and system will be more efficient requiring
less time and operating at the base station’s optimal
performance never waiting for data to arrive from the
IPNC.
128,000 bps 256,000 bps
Ideal rate and system will be more efficient requiring
less time and operating at the base station’s optimal
performance never waiting for data to arrive from the
IPNC.
The 56 kbps DDS line is typically used to create the 57,600 bps asynchronous data line for the serial line
Internet protocol (SLIP) connection between the Internet Protocol Network Controller location and the
base station site.