Proxim Stratum, Installation And Maintenance Manual

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Stratum Installation and Maintenance Guide Chapter 1: Introduction
••••
9
Standard Configuration
The Stratum consists of three units:
•
The Indoor Unit (IDU) is a rack-mountable unit that contains the electronic bridging components. The
IDU can be installed in any convenient climate-controlled location within a building. The IDU must be
powered from an 110V or 220V AC source.
•
The Outdoor Unit (ODU) is a pole-mountable weather tight unit which contains the RF components and
includes an 18" x 18" x ¾" flat panel antenna. An ODU-A transmits in the mid-UNII band, centered at
5287 MHz. An ODU-B transmits in the upper-UNII band centered at 5782 MHz. One ODU-A and one
ODU-B are required for a Stratum link.
•
The Alignment Mounting Bracket (AMB) is a galvanized steel bracket used to mount the ODU to a pole
of 1.9 to 3.5 inch diameter. The AMB can be adjusted on the pole in both vertical and horizontal axes to
align the flat panel antenna along the line-of-sight path.
The IDU and ODU must be interconnected via two multi-mode fiber cables, one for transmit, one for receive. A
shielded two-conductor cable (with drain) is required to supply DC power from the IDU to the ODU. The IDU will
supply adequate DC power over a 1000-foot span to the ODU using 18 AWG wire pair.
Figure 1 shows a typical link bridging network traffic between two buildings. The two ODUs in the diagram are
mounted on the roofs of two adjacent buildings and the associated IDUs are located inside these buildings.
Indoor Unit (IDU)
Outdoor Unit (ODU)
mounted on pole
Indoor Unit (IDU)
Outdoor Unit (ODU)
mounted on pole
power
and
multi-mode fiber
cables
Figure 1
Sample Stratum Installation
The standard Stratum link is supplied with a pair of high-performance, flat panel phased-array antennas to establish
a connection over a distance of up to 4 miles. The small antenna size (18"x18"x3/4") and light-weight outdoor unit
allow building-top installations to use a cost effective tripod or parapet-braced pole mount. Alternatively, a Stratum
link can establish a connection over a distance of up to 7 miles using a high-gain parabolic antenna at one end.
Optional External Antenna Configurations
For extended range applications, the ODU at the “B” end of the Stratum link may be supplied with an “N”
connector for an external parabolic antenna instead of the integral flat panel antenna. The ODU-B-EXT allows the
Stratum to utilize industry standard parabolic antennas. Parabolic antennas are commercially available in 2, 4, and
6-foot diameters that are characterized for both the mid and upper U-NII frequency bands. Use of such antennas can
increase overall link system gain to achieve connectivity over a distance of up to 7 miles with 99.99% Availability.