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APPENDIX A: BACKHAUL REQUIREMENTS
©2005 IMobileNet, Inc. Revision & Copyright HSBS User Manual
516.80540.UM-Rev. D 1-Jun-07 Page 28 of 38
Backhaul Systems
Considering the backhaul system between the base station location and the Internet Protocol Network
Controller location is one of the most critical elements of data transmission. Once data has been
received at the base station, it must be relayed to the IPNC at the user's location quickly, accurately, and
reliably.
Industry standard backhauls are appropriate for IPMobileNet data transmission as long as data is
transmitted cleanly and dependably. Depending upon conditions and accessibility, the preferred method
of data transmission to the remote site is through a wired backhaul.
Wired Backhaul
The Ethernet backhaul is preferred as it uses a T1 (or fractional T1) line or equivalent, which handles
larger volumes of digital data. If the backhaul will be via SLIP connection, then four (4) wire DDS
telephone lines capable of 56 kbps is recommended.
Do not order a 64 kbps line as it is incompatible with IPMobileNet’s equipment data transmission
speed.
One disadvantage of using wired lines is that the system is under the control of an outside
agency and telephone line faults or system outages impose potential loss of radio communication
through the site affected.
Microwave Transmission Link
Using a microwave transmission link is another option, which is often used when wire cannot be brought
into remote locations. Data transmission is generally very reliable, but adverse conditions can degrade
the quality of the data. High winds, ice on the microwave dish, and other environmental variables can
cause problems and prevent data or voice from completing transmitting.
Newest Backhaul
The 802.11 range of products for wireless data transmission. Several models of 802.11 have been used
successfully.
Be aware of the possibility of interference on the 2.4 GHz frequency range. The 802.11 product
should only be used for short hops with clear line-of-sight in an environment where minimal radio
interference will exist.