Oracle MICROS 700 Series Site Preparation Manual page 76

The MICROS Wired Bumpbar is supplied with a 6ft. (1.8M) cable. The 11 foot cable is
also available (PN 700503-070-PT).
MICROS Wireless Bumpbar Installation Considerations
The MICROS Wireless Bumpbar MBB-10 and MBB-20 User Guide contains
information for installing the wireless bumpbar.
Before installing the mounting brackets, consider the following site related issues to
ensure the best possible functionality from the MWBB in an active RF environment.
• Range
Distances up to 30 feet are possible when the dongle and bumpbar are within
sight of each other, with no obstructions in the path of the RF signals.
As the number and type of obstructions between the dongle and bumpbar
increase, the range decreases.
• Classification of RF Obstructions
RF signals encounter two types of obstructions that either weaken or reflect the
signal, depending on its material composition.
The first type of obstruction is one that allows the signal to pass through, but
attenuates, or weakens it. Some examples include walls constructed of wood,
drywall, people, and concrete block. The amount of attenuation is proportional to
the total thickness of materials that the RF signal must penetrate when traveling
the line-of-sight path.
The second type of obstruction is one that reflects the RF signals, allowing little or
none to pass through. The reflected RF energy can cause interference even when
the dongle and bumpbar are located within line-of-sight. Any type of metallic
substance falls into this category. This includes objects such as stainless steel
food preparation areas, walk-in freezers, steel doors, and steel support beams.
• Local RF Interference
The RF signals emitted by the MWBB are located in the unlicensed 2.40 - 2.50
GHz ISM band. Nearby occupants of this band include microwave ovens (2.485
GHz), 802.11 b/g Wi-Fi, cordless phones, IEEE 802.15.4 (WPAN), ZigBee, and
other personal area networks. Ensure the MWBB is located as far from these
devices as possible.
The greater the distance between the dongle and the bumpbar, plus the greater
the number of obstructions between the two devices, allows extraneous RF
devices to impact the operation of the wireless bumpbar.
In cases where the site is too noisy in terms of RF interference, Oracle MICROS
recommends the use of the MBB-10 and MBB-20 wired Bumpbars.
Chapter 19
Kitchen Display System Installation
19-3