Operation Manual

System Description
22
Remote Unit (RU)
Remote units are available in a wide range of frequencies, gain and output power to cater to support a variety of
requirements. Remote units are also capable of supporting more than one frequency band in a single unit.
Chassis types
Remote units (RUs) are available in two chassis, a single compact chassis
for 1-2 bands and a dual chassis for up to 4
bands ( Figure 19 ). There are multiple configurations that allow for various power level of amplifiers to be placed
into the chassis. For example it is possible to build a dual chassis with 2 medium power bands and 1 high power
band in the same remote. Each side of a dual chassis is virtually identical to a single chassis remote unit. This
ensures unparalleled flexibility when building multiple operator / multiple band solutions.
A dual chassis may have 1-2 fiber optical remote units (FOR). This allow
s for redundant fiber feeds, multiple-input
and multiple-output (MIMO) applications, and dedicated amplifiers.
Figure 19
Single Chassis
Remote Unit
Dual Chassis
Remote Unit
Remote Unit Chassis Types
All Remote Units have an excellent noise figure, contributing to an overall noise figure for the whole system from
remote to head-end into the base station of < 3 dB for the RF link.
Both chassis comply with IP65 protection for use in any environment. The durable coating assists in convection
cooling. No fans are used for the Remote Units.
Note: The heat generated by the Remote Units when powered up is used to prevent water ingress
into units. Remote units must remain powered on when mounted outdoors.
Both wall or pole mounting kits are available for chassis mounting.
Table 17 contains a list of the most common remote units that are used with the Bird Fiber-DAS system. Variants
are available upon request.
Table 17
Product code
Pout (ETSI)
†
† Actual power determined by frequency band and spectrum demands.
Pout (FCC) Bands
DDR (medium power). See
"DDR" on page 23 .
26-30 33 1-4
DDS (High power quad band). See "DDS" on page 27 .
41 1-4
DDH (high power). See "DDH" on page 29 .
32-43 43 1-2
DDU (high power). See "DDU" on page 32 .
46 1-2
Remote Comparison Table