Avaya B5800 User Manual Page 46

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Grounding
Use of ground connections reduces the likelihood of problems in most telephony and data
systems. This is especially important in buildings where multiple items of equipment are
interconnected using long cable runs, for example phone and data networks.
All control units and external expansion modules must be connected to a functional ground.
Where the unit is connected to a power outlet using a power cord with an earth lead, the power
outlet must be connected to a protective earth.
In some cases, such as ground start trunks, in addition to being a protective measure this is a
functional requirement for the equipment to operate. In other cases it may be a locale regulatory
requirement and or a necessary protective step, for example areas of high lightning risk.
For more information about grounding including the location of the ground points on the control
unit and external expansion modules, see Grounding on page 73.
Wall and rack mounting
The B5800 Branch Gateway control unit is designed to be freestanding. When external
expansion modules are used, the control unit and expansion modules are intended to be
stacked. With optional mounting kits, the system can be wall or rack mounted. See
Wall
mounting on page 67 and Rack mounting on page 69 for more information.
Voice compression channels
Calls to and from IP devices can require conversion to the audio codec format being used by
the IP device. For B5800 Branch Gateway systems this conversion is done by voice
compression channels. These support the common IP audio codecs G711, G723 and
G729a.
For the B5800 Branch Gateway control unit, channels can be added using VCM base cards,
BRI combination cards, and ATM combination cards. See
System components on page 20 for
more information about these cards.
The voice compression channels are used as follows:
Installation requirements
46 Implementing B5800 Branch Gateway for a CS 1000 Configuration October 2012
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