Section 365-262-205
3
2.
INSPECTION
2.1
Inspect for Damages
Inspect the equipment thoroughly upon delivery. If the equipment has been damaged in transit, immediately re-
port the extent of damage to the transportation company.
2.2
Equipment Identification
Charles Industries’ equipment is identified by a model and issue number imprinted on the front panel or located
elsewhere on the equipment. Each time a major engineering design change is made on the equipment, the issue
number is advanced by 1 and imprinted on subsequent units manufactured. Therefore, be sure to include both
the model number and its issue number when making inquiries about the equipment.
2.3
Static Concerns
Each channel unit is shipped in a static-protective carton to prevent electrostatic charges from damaging CMOS
devices. A unit intended for future use should be tested as soon as possible and returned to its protective carton
for storage. A protective carton can be identified by a black coating on the inside. Previously, Charles Industries
used an uncoated carton and enclosed the channel unit in a black or brown static-protective plastic bag.
Channel units contain sensitive electronic devices. Do not ship or store them near strong
electrostatic, electromagnetic, magnetic, or radioactive fields. Use either the coated cartons or the
protective bags with uncoated cartons for shipping or storage of channel units.
CAUTION
3.
APPLICATION GUIDELINES
The 4W E&M/PLR channel units allow versatility for use in many applications. These units provide switch-select-
able E&M or PLR signaling and an E&M reversal switch to accommodate office wiring and test equipment inter-
facing for testing.
The 3652–62 (E2M2) provides an additional pair of E&M leads which can be used for tandem Foreign Exchange
(FX) applications, alarm monitoring, or toll-ticketing.
Both the 3652–62 and 3652–68 can be used as universal spares for all 4W E&M or PLR channel units to cover a
wide range of applications with maximum flexibility. Refer to Figure 2 through Figure 4 for typical applications.
3.1
Type I, II, III or PLR Signaling Interfacing
The signaling port of the 4W E&M channel units can be optioned for a Type I, II, or III interface. Type I is used
when no ground potential exists between the trunk circuit and the carrier terminal. Type II is used when a differ-
ence in ground potential exists. Type III uses 3-wire balanced signaling leads for the M-lead, however; it relies on
a return from the channel unit through ground for operating the E RELAY in the trunk circuit. The PLR signaling
utilizes a negative battery to interface between the CO trunk circuit and the 4W E&M circuit. Refer to Figure 5 for
the various interface applications.
T1
R1
T
R
E
M
T
R
T1
R1
E
M
-16dB
+7dB
DS1
TOLL TRUNK
OR PBX
TIE LINES
4W
E&M
360/363
D4
TERMINAL
Figure 2. Typical 4W E&M Application
