Bell System Practices 851 Identification, Installation, Connections, And Maintenance page 5

ISS 8, SECTION 503-601-101
CONNECTOR
KS-16671 Ll
Fig. 6-851CM or 2851CM Telephone Set Showing KS-16671L1 Mounting Cord Connector
Note: •care must be exercised in securing
the connector cable to eliminate the possibility
of undue strain on the conductors and to
prevent damage to the insulation of the
conductors which could cause shorts. Plastic
tie-wraps should be used to bundle the
conductors in order to protect the leads from
being damaged when closing the hinged chassis .•
3. 10
Exclusion Switch: To provide exclusion,
install the exclusion switch assembly as
follows.
(1) With chassis in lowered position, fasten
switch assembly to line switch bracket using
screw provided in kit. Screw must be inserted
in hole from rear of bracket.
(2) Position switch assembly horizontally (Fig. 5
or 10) and fasten securely.
3.11
Polarity Guard: When required with
the 2851-type telephone set, install the
adhesive backed 819041971 (P-90D197) guard assembly
to the left-hand bracket in the position shown in
Fig. 11.
3.12
3-Type (MD) Speakerphone: These
sets are factory-wired for 3-type speakerphone
except that the 851-type telephone set requires
the replacement of the 8RA dial with an 8CA dial
to provide a second set of off-normal contacts (P3
and P4 leads). When replacing the dial, the adapter
brackets must be removed from the 8RA dial and
added to the 8CA dial (Fig. 12). With both the
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