Install Instructions

SRU Installation
2-4 SRU Inst allat ion Manual 17286-1000 Rev. B 03/14/01
• Cable - G round the cable at building entry and use lightning arrestors at the
antenna and the indoor equipment.
• Subscriber Radio Unit (SRU) - Ground the SRU to the rooftop lightning grid
via the lug in the enclosure. Use heavy gauge wire (10AWG).
2.2 .3
2.2 .32.2 .3
2.2 .3 Light ning Prote ct ion
Light ning Prote ct ionLight ning Prote ct ion
Light ning Prote ct ion
A lightning arrestor is recommended for all SRU installations (not part of the Netro
equipment or installation). You should also fit suitable lightning protection to the signal
cabling.
2.2 .4
2.2 .42.2 .4
2.2 .4 M ount ing Spec ifica t ions
M ount ing Spec ifica t ionsM ount ing Spec ifica t ions
M ount ing Spec ifica t ions
Netro pole mounts support poles of 2 to 4.5 inches (50 to 114 mm) in diameter. A single
pole mount design supports 26 G Hz, 28 G Hz, 39 G Hz, and 10 G Hz SRUs. Table 2-1
shows the specification of torque that must be applied on all M10 bolts in the mounting
process. The Torque Specifications are listed in Newton-Meter (Torque N-M), in
Feet-Pound (Torque FT-LB), and in Inch-Pound (Torque IN-LB).
Table 2-1 Torque Specifications
Screw Size Torque N-M Torque FT-LB Torque IN-LB
M10 40.0 29.5 354.0
2.2 .5
2.2 .52.2 .5
2.2 .5 Wind Loading Require me nts
Wind Loading Require me ntsWind Loading Require me nts
Wind Loading Require me nts
For the pole mount, the coordinate origin is set in the centerline of the pole, located in the
middle of the two bolts in Z-axis (not the base of the mounting bracket).
The Appendix in the AirStar Operations Guide contains Wind Load analysis reports for 10
GHz and 26 GHz SRUs.
2.3 Out door Inst allat ion of SRU w ith Inte gral
Antenna
This section describes the procedures for installing the 26 GHz, 28 GHz, 39 GHz, and 10
GHz Subscriber Radio Unit (SRU) to a pole. The way you planned your network will
determine the location, height, elevation angle, and azimuth direction of the SRU being
installed.
The 26 G Hz, 28 G Hz, and 39 G Hz SRU antennae are vertically polarized. The 10 GHz
SRU may be installed with either vertical or horizontal polarization. To preserve the
polarization, the SRU must be mounted with the same orientation as shown in the
installation figures. The SRU will not function properly if its polarization is not correct, and
does not match that of the BRU.