between the chassis grounding stud and a suitable ground. Connect either AC or DC power cables as
FAILURE TO PROPERLY GROUND THE LDF MAY CAUSE AN
ELECTRICAL NOISE THAT CAN INTERFERE WITH BOTH VOICE AND FACSIMILE
TRANSMISSIONS, AND IT MAY PERMANENTLY DAMAGE INTERNAL CIRCUITS.
GROUND LDF BY CONNECTING CHASSIS GROUND STUD TO EARTH GROUND.
EARTH GROUND MAY BE GROUND STAKE IN FIELD USE, VEHICLE FRAME IN
MOBILE USE, OR BUILDING POWER GROUNDING OR WATER PIPE IN A FIXED-SITE
b. Remove dust cap from connector J2.
c. If using +28 V DC input power, connect DC power cable between connector J2 and DC
power supply. Connect ground return pigtail lug to LDF chassis ground stud. If using AC input power,
connect AC power cable between connector J2 and AC power source. (Refer to Table 3 for power cable
Interconnections. Data signal cable connector J1, and PHONE and LINE binding posts are
located at the right rear of the LDF (Figure 7). Handset connector J3 is located on the lower right-hand
front edge of the LDF. LDF cabling interface with communications link equipment depends on the type
of link being utilized. Typical link interconnections and special interconnection requirements for
VINSON equipment are described here. Table 3 lists the cables associated with the external connectors,
connector functions, and cable options. Table 4 lists typical communications link equipment the LDF
can use in the various operations during analog and digital transmission.