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S8: No lines switch
This switch sets the 2+S to work as a switching system without the
exchange line ports connected. The 2+S can then be used as a switching
system on its own, totally independent of the exchange lines, but using
the extension ports only.
Use of the No lines switch is primarily intended to allow the 2+S
extensions to be tested prior to the standard Pre-Connection Inspection
(PCD as part of the DTI procedures for installation of multi-line switching
systems.
Set switch S8 as required in accordance with the No lines table as given
in Figure 2.5 (see Section 6.1
Switch bank SW2, Extensions equipped
2.1.13.2
This switch bank consists of eight switches numbered from Sl to S8,
which correspond to extensions 20 to 27 respectively. Set the switch up if
the extension is equipped, and down if the extension is not equipped.
Note
Although extensions 20 and 21 are always equipped, and consequently
switches Sl and S2 do not work, it is recommended that you set them
both in the up position so that is possible to tell how many extensions are
equipped by glancing at the switch bank.
Switch bank SW3, Call barr i ng, line
2.1.13.3
This switch bank consists of eight switches numbered from Sl to SS,
which correspond to extensions 20 to 27 respectively. Set the switch up if
the extension which it controls is to be barred from access to exchange
line port 1. (Internal calls and incoming exchange line calls will be
allowed.) Set the switch down if the extension is to be allowed access.
Note
Extension 20 cannot be barred from access to exchange line port 1 or 2,
so switch Sl has no effect.
Switch bank SW4, Call barring, line 2
2.1.13.4
This switch bank consists of eight switches, numbered from Sl to SS
which correspond to extensions 20 to 27 respectively. Set the switch up if
the extension which it controls is to be barred from access to exchange
line port 2 (internal and incoming calls will be allowed). Set the switch
down if the extension is to be allowed access.
Note
Extension 20 cannot be barred from access to exchange line port 1 or 2,
so switch Sl has no effect.
Line voltage feed
2.i.14
When the CCU is unpacked, the exchange line ports are set to work with
standard exchange line 50V line feed. If the exchange line feed is low, for
example, about 24V, the 24V line feed option links must be set. These are
identified on the main PCB as:
- 9LK24V (for line 1)
- 10LK24V (for line 2).
1371Issue3(4/91)
TPU
Commissioning the system).
Installation procedures
1
2-12
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