Nortel Networks T7406 - Manual (Page 25)

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T7406 Cordless Handset Installation Guide
Chapter 2
Provisioning the T7406
This chapter provides specification and provisioning information for the T7406 cordless system.
The T7406 is a Frequency Hopping Spread Spectrum (FHSS) cordless telephone. The benefits of
this technology are: improved range, robustness and, less susceptibility to interference, fading and
multipath.
The use of a common wall-mounted base station for multiple handsets allows you to position the
base antennas for maximum performance and coverage. The indoor range of the T7406 is 95
meters (300 feet) in a typical office environment. This range may vary with differing
environments.
Operational Bandwidths
The T7406 cordless telephone operates in the ISM (Industrial, Scientific, and Medical) 902-928
MHz band. The T7406 divides the ISM band into two sets of operating frequencies to allow the
coexistence of other ISM devices. Examples of these products are SKU scanners and remote
controls for products such as garage door openers and home theatre systems. Note that, since the
T7406 is a frequency hopper, it uses at least half of the available frequencies in the ISM band for
operation and can make it difficult for other 900 MHz devices to operate correctly. The following
table identifies the frequencies used for the upper and lower bands of operation:
• Lower: 902 - 915 MHz
• Upper: 915.1 - 928 MHz
These bands are selectable for each base station through dip switches located on the back of the
T7406 base station. Each base station supports up to three handsets. Selection of the correct band
for operation may minimize interference between devices.
Operational Parameters
For example, with a configuration of six handsets, two base stations are required (three handsets
per base station). One base station will be set to the upper band, and the other base station will be
set to the lower band.
Another example is an environment that already contains another 900 Mhz device (e.g. a scanner
with 900 Mhz wireless connection to a LAN). In this environment, only one T7406 base station
should be installed. Set the T7406 base station dip switch to the opposite band that the scanner is
operating in.
Installation Site Parameters
Physical characteristics of the site where the T7406 is to be installed, or has been installed, must be
evaluated to maximize the performance of the T7406 telephone. Outlined below are some of the
most common characteristics to be considered: