BT 2+8, Installation And Maintenance Manual

Page: 19 / 40

Installation procedures
Figure 2.5 DIL switches
SW1
No lines
SW2 SW3 SW4
Extension
Extension equipage
Ca llbarring Line 1 Callbarring Line 2
Extensions Extensions Extensions
510 D D D
20 27 20 27 20 27
DODD DODD DDDDDDDD DDDDDDDD
Spare
Recall
Exchange line
up =equipped
up = barr up = barr
equipage
down= unequipped
down =no barr down =no barr
Note: Extension 20 cannot be barred
Mode of operation Sl
S2
Recall
PABX Down Down
ELR
Keysystem Down Up
TBR 600ms
TBR 250ms
Exclusive line Up Down
TBR95mms*
Exchange lines
SS
Ring bridge
One exchange line only Up
Short*
Both exchange lines equipped
Down
Long
No lines
SB
* UK setting
No exchange lines connected
Up
Exchange line(s) connected
Down
Note The TBR duration options of 250ms or 600ms are only provided for
Continental installations.
Note Ring Bridge is set to Short interval ring duration. The Long duration
option is provided only for Continental installations where it may be
needed.
TPU 1371Issue 3(4/91)
S3
S4
Up Up
Down
Up
Up Down
Down Down
S6
Down
Up
2-10