Avaya IP Office Phone Manager, Installation Manual, Page: 40 / 411

IP Office Installation Page 39
15-601042 Issue 20b (16 July 2009) IP Office
System Overview: Grounding
2.15 Lightning Protection/Out-of-Building Connections
The following are the only supported scenarios in which wired extensions and devices outside the main building can be
connected to the IP Office system. In these scenarios, additional protection, in the form of protective grounding and
surge protectors, must be fitted.
•
The fitting of additional protection does not remove the risk of damage. It merely reduces the chances of damage.
Cabling Requirements
•
Cables of different types, for example trunk lines, extensions, ground and power connections, should be kept separate.
•
All cabling between building should be enclosed in grounded ducting. Ideally this ducting should be buried.
•
A Primary Protection Box must be provided at the point where the cables enter the building. This should be three point
protection (tip, ring and ground). Typically this would be gas tube protection provided by the local telephone company.
The ground wire must be thick enough to handle all the lines being affected by indirect strike at the same time.
Connection Type Protection Device Type Requirement
DS Phone Extensions
Digital Station Expansion
module DS ports only.
ITWLinx towerMAX DS/2
Supports up to 4 connections.
(This device was previously
referred to as the Avaya 146E).
•
Connection from the expansion module to the
phone must be via a surge protector at each end
and via the primary protection point in each
building.
•
The IP Office expansion module and control unit
and IROB devices must be connected to the
protective ground point in their building.
•
The between building connection must be via
earthed ducting, preferable underground. The
cable must not be exposed externally at any point.
Analog Phone Extensions
Phones Expansion module (
POT or PHONE ) ports only.
IP Office Barrier Box
Supports a single connection.
Maximum of 16 on any expansion
module.
Analog Trunks ITWLinx towerMAX CO/4x4
Supports up to 4 two-wire lines.
(This device was previously
referred to as the Avaya 146C).
For installations in the Republic of South Africa, the
fitting of surge protection on analog trunks is a
requirement.
For other locations where the risk of lightning strikes
is felt to be high, additional protection of incoming
analog trunks is recommended.
External Output Switch ITWLinx towerMAX SCL/8
(This device was previously
referred to as the Avaya 146G)
Connections from an IP Office Ext O/P port to an
external relay device must be via a surge protector.
The towerMAX range of devices are supplied by ITWLinx ( http://www.itwlinx.com ).