2N Omega Series - Instalation Manual - Manual (Page 41)

2N
®
- OMEGA Lite
Installation manual
Installation manual
41
www.2n.cz
9. Expanding PBX
The PBX can be expanded as desired by buying further modules up to the
maximum configuration (24 lines). But it is necessary to be aware that every
expansion constitutes intervention in the installation, and if done inexpertly it could
threaten the functioning of the whole. In other words, the same level of knowledge as
for the complete installation is required for this activity.
There exist two possible methods:
1. Complete reinstallation of PBX – the advantage is the clarity of the procedure
and optimum result, the disadvantage is the amount of work involved.
2. Addition of new modules without intervention in original part. The result is not
always optimal, but there is less work. It is once again necessary to proceed
according to the same rules which apply for the installation of a new PBX.
When expanding the PBX by either of the above methods, it is necessary to
adhere to this procedure:
1. Before starting work, make backup copies of the PBX programming and
accounting data.
2. Before starting work, check that all lines work.
3. Respect the warranty conditions.
4. Use only new or tested modules.
5. First of all decide on the location of modules on paper.
6. Mount all modules.
7. Add cabling.
8. After the actual installation, retest the function of all lines – new and original.
9. It is always necessary to programme the new configuration again.
10. Test all functions which you have programmed.
11. Make another backup copy of the PBX programming.
12. Document all changes made.
10. Installation of front-end protection
If you have decided to install front-end overvoltage protection, we recommend
that:
•
You carefully consider which lines you will protect (air lines, external lines or all
lines).
•
You use protection which has signficantly better properties, for example.:
- 2N
®
SAFE 3+,– shorting resilience with circuit 30V,
- 2N ® ANTIBLESK II module A+,- leak current 2 x 20 kA
•
Locate front-end protection at the entry of the wiring to the building. You will thus
gain the greatest effectiveness and you will also limit the possibility of induction
overvoltage in other circuits in the building.
•
Under extreme conditions use protection which can be replaced easily (range 2N
®
SAFE).