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Preliminary Document
Confidential
EMS Wireless
Link2Cell™-19 Manual
Description
The Link2Cell™-19 SOHO, (Small Office-Home Office) Signal Enhancer, is a PCS band, bi-
directional amplifier unit and was designed to provide enhanced RF coverage for wireless
systems in small facilities. Usage includes providing coverage in retail stores, offices,
warehouses, restaurants, homes, etc.
The Link2Cell™-19 is housed in an indoor mountable enclosure, and is powered with a
regulated wall mountable power supply.
The Link2Cell™-19 supports all system protocols including CDMA, GSM/PCS1900 and
TDMA and a single model will cover all licensed 1.9 GHz PCS bands A through F. The
Link2Cell™-19 features Auto set-up, lightweight compact enclosure with internal antennas,
local alarming, and excellent electrical specifications, high reliability with cost effective
pricing.
Functionality
The Link2Cell™-19 is capable of automatically adjusting its own signal gain levels up to the
maximum output power levels. The Link2Cell™-19 detects the downlink output power and
adjusts the level for 2 dBm composite output power and continues to monitor and reset the
gain as required for proper system performance. For example, when CDMA protocol system
is being amplified, there could be an error in set up initially resulting from only pilot sync, and
paging Walsh codes being present on the RF carrier. The Link2Cell™-19 will reduce the
system gain until no signal is received that will exceed the output power setting. This
prevents the Link2Cell™-19 from setting up to a higher in power level than actually desired if
all of the Walsh codes were present. The gain does not continually change to maintain an
output power of 2 dBm AGC (Automatic Gain Control) since this would defeat the benefits
of power control in the service providers system.
The Link2Cell™ has 40 dB of gain control in the uplink and downlink signal paths. This
gain is controlled by a microprocessor that monitors the system operation on a real time basis.
The uplink and downlink attenuators are controlled by the internal microprocessor to adjust
for maximum gain in both paths. The uplink and dowlink signal paths are adjusted to the same
setting by the microprocessor unless the system determines this is not optimum for the units
operation.
Alarming
Alarming monitoring is accomplished in the Link2Cell™ by the microprocessor, which will
detect a failure in gain or a system oscillation. This is indicated to the user by a solid constant
TM
Link2Cell
-19
8
Manual
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