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SECTION 5 1 8-450- 1 00
4.9 1
The station busy feature of the 6B1/MW
console is similar to that of the 6A1/DSS
console as described in 4.85.
Ca u tion: Although all CO/PBX and
intercom line buttons may be unoperated,
a busy sta tion indica tion is displayed
at the 6A l/DSS or 6Bl/MW console
when a station handset is left off-hook.
N. Station Restriction
4.92
This feature prevents any outgoing CO/PBX
calls from being made at a restricted station.
4.93
The restricted station may receive calls, but
cannot call out on CO/PBX lines. This is
accomplished by adding a diode (rotary dial sets
only) and reversing two leads in the telephone set.
On TOUCH-TONE sets, two leads must be reversed
in the telephone sets.
4.94
Install 446F diode (or equivalent) between
network terminals RR and F (rotary dial
sets only). Terminate negative (cathode) lead of
diode on terminal F with positive (anode) lead on
terminal RR (arrow pointing toward terminal F).
On telephone set terminal board (rotary and
TOUCH-TONE dial sets), move
green
lead from
terminal 22 to 4, and move
red
lead from terminal
4 to 22.
Ca u tion: Make s ure bare leads of
the diode do not come into contact
with the case of the network, other
network terminals, or other parts of
the telephone s e t.
Use insula ting
sleeving where required.
Page 70
0.
TOUCH TONE® Dialing
4.95
Where TOUCH-TONE dial telephone sets
are used with the 7A System; a 440A (MD)
or 487B KTU (TOUCH-TONE adapter) is required.
These are the only TOUCH-TONE adapters usable
in this system and are installed in J13 and J14.
See Fig. 59 for KTU location. The adapter converts
the multifrequency tones from the telephone set
dial to contact closures which supply ground to
the proper leads in the code selector circuit, 424B
or 424C KTU.
4.96
When the adapter used is a 478B, be sure
that A and B ground are available at the
J13/14 connector (Fig. 21 and 73). If these grounds
are not connected, install the wiring kit supplied
with the 478B KTU.
4.97
Remove the RS1 to CG strap in column A
of connecting block 1 when any TOUCH-TONE
adapter KTU is installed (Fig. 60).
TABLE N
CONSOLE CONNECTION I NDEX
(SEE NOTE)
NUMBER O F MW (681) CONSOLES
0
Fig.
51
Fig. 5 4
Fig. 5 8
Fig.
50
Fig.
52
Fig. 56
Fig.
53
Fig. 55
Fig.
57
Note:
Determine
number
of DSS consoles and
MW
consoles to
be
installed and select appli
cable connection diagram from table.