BT 2+8, Руководство по установке и обслуживанию

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Statutory information
10-1
10.1
Statutory information
These notes are applicable to 2+8 systems installed in the UK and
connected to telecommunication systems operated by British
Telecommunications, Kingston Communications (Hull) plc, or Mercury
Communications Ltd.
•
The system is suitable for use on Exchange and Private branch exchange
Lines which provide either Pulse or TouchTone signalling.
•
The 2+8 has been fully safety tested to BS 6301.
WARNING
Connect only apparatus complying with BS 6301 to the
extension ports. Other use will invalidate any approval given to
the apparatus.
•
The total Ringer Equivalence Number (REN) of each extension is 4.
Note Only one System phone can be connected to a single extension.
•
The REN of each Exchange line port is 1.
•
The REN of each of the Extension ports is 4.
•
The Approval for the use of External Extensions (connection of extension
instruments) by the Department of Trade and Industry, is only granted
provided the installation of the extension instrument is within the
confines of the customer's premises and that the distance of the
extension instrument from the 2+8 Control Unit does not exceed the
followng limits when using 0.5mm2 copper conductor:
- 150m for 2+8 System phone
- 300m for approved (green spot) telephones.
•
The 2+8 should be installed in accordance with BS 6701:Parts 1 and 2.
•
In order to provide a visual indication of the status of the lines of the 2+8
system, it is recommended that at least one extension instrument be a
System phone.
•
Only telephones approved to BS 6317 1982 shall be connected to the 2+8
system. These must have a
RECALL
key and be capable of sending Earth
Loop recall. Time Break recall types are not suitable.
•
The 2+8 is suitable for connection in subsidiary mode to most PBXs;
however, satisfactory performance cannot be guaranteed with every
allowable combination of host and subsidiary system.
•
A power failure will reset the system and return all extensions to their
defaults. During power failure, extension 20 is connected to line 1, and
extension 21 is connected to line 2, to enable incoming and outgoing calls.
•
The approval of the 2+8 facilities does not guarantee their satisfactory
performance under all operating conditions.
TPU 1371
Issue
3 (4/91)