User's Manual

SME VoIP System Guide, Version 2.6
Proprietary and Confidential
Chapter:
Appendix C: SME VoIP Network Planning/Optimization
119
Core Network Equipment:
This equipment is at the premises of the service operator or data centre. Depending on the network
requirements the following devices should be available:
VLAN/NAT aware router(s), Session Border Controller, DHCP/TFTP/FTP Servers, STUN Server, Media Server,
Access Gateway, SIP Server, etc.
12.6 Environmental Considerations
In this section, we enumerate some environmental conditions that need to be considered prior to planning,
deployment and optimisation of the SME network. The considerations are as follows:
• Ensure that the installation area is clean and dry.
• Ensure that the floor of the installation area is finished with linoleum, vinyl, ceramic, wooden flooring,
computer floor tiles, or polished sealed concrete.
• Ensure that the ceiling of the installation area is finished or treated to prevent particle discharge.
• Ensure that the installation area is well lit, and that the light source is uniformly diffused without
shadows. Adequate lighting should provide a comfortable reading level and allow the identification of
wire insulator colours without undue eye fatigue. Lighting should be comparable to an office work
environment, with a minimum level of 21 meter/68.9 feet at each work surface. As a rule of thumb, in a
room with a 2.5 meters/8.2 feet ceiling, one 1.2 meters/4 feet fluorescent tube provides sufficient
illumination for 1.9-2.4 square meters/20.5-25.9 square feet.
• Ensure that ventilation of the installation area is capable of maintaining an ambient temperature of 0-
40°C/32-104°F, and a relative humidity of 20-80% non-condensing, while the system is operating. The
maximum power rating of a base station under full load should not exceed 315W/1070 BTU/Hr. These
figures are for each cabinet only, and do not take into account heat generated by other equipment. In
particular, charging fully-discharged batteries may generate a considerable amount of heat, depending
on battery capacity and rate of charge. Refer to the equipment manufacturer data for more
information.
• Ensure that the installation area is free of caustic or corrosive liquids, substances, or materials. If
batteries will be installed as part of the system, ensure that adequate precautions are taken (such as
special ventilation) to prevent corrosive emissions from the batteries. Check local building codes for
additional requirements.
12.7 Recommended Base station/Repeater Placement
There is no one strategy for deploying base stations. These are some recommended Base station and/or
Repeater placement strategies:
Around Corridors:
Base stations/repeater should be deployed vertically preferably at corridor intersections where
propagation patterns follow the corridor patterns. The base station/repeater should point towards the
corridor and preferably in the middle height between the floor and the actual ceiling. In case there are high
objects in the area, the base station/repeater should be installed above those objects but still kept distant
from the ceiling.
Multi-Storey Buildings:
Base stations and repeaters can be installed on opposite sides of the floors to take advantage of the floor-
to-floor coverage. The coverage design cannot rely entirely on floor-to-floor propagation; each case must
be verified due to variations in local attenuation patterns.