Section DSA-WM2-140-202
030-101674 Rev. A
R
6
0803I2RA
Figure 5. Close-Up of Connector Types
Pin 4 (R)
Typical RJ48C Jack
Pin 1 (R1)
Pin 2 (T1)
Pin 5 (T)
1
2
3
4
5
6
7
8
Front
Rear
Amphenol-type 50-pin Male
RCV and XMT Connector
Pin 50
Pin 26
Pin 25
Pin 1
RJ48H
J1 Through J14
J15
Customer Side Connections
CO Side Connections
Pin 50
Pin 26
Pin 25
Pin 1
Customer Side Connections
(Female)
Cable Output Direction
Cable Output Direction
J16
- GROUNDING CAUTION -
Always follow local safety precautions and standard operat-
ing procedures for grounding the equipment when instal-
ling, upgrading, repairing or maintaining equipment. Any
instructions or information contained herein is subordinate
to local codes, operating procedures or practices.
3.5
Grounding
When properly installed, the DSAWM-214 enclosure is a total-
ly grounded system at the installation site. The enclosure
provides points for chassis/frame, circuit ground, cable shield
ground, and a static ground.
3.5.1
Chassis/Frame Ground Connections
Chassis ground prevents voltage from building up on the sur-
face of the equipment. The enclosure chassis must be
connected to an earth ground at all times in order to properly
ground the enclosure’s metal framework and all module front
panels. A separate ground conductor/wire is recommended for
chassis/frame ground (separate from the circuit ground). One
end of this conductor/wire must be connected to the enclo-
sure’s external ground lug (located near the front of the unit
under the module housing, as shown in Figure 6) and the other
end must be wired directly into the multi-ground neutral of the
building ground. A shorting bar is provided (but not factory-
installed) for optional installation between the CHASSIS
GND and CKT GND terminals on TB1, for applications re-
quiring chassis ground to be connected to circuit ground.
3.5.2
Circuit Ground Connections for Local DC Power
Circuit ground provides a lightning return path and is recom-
mended to be directly and separately connected to earth
ground regardless of the power source or type (local or span).
Circuit ground must be connected to position CKT GND of
TB1 on the
Telco Termination Module
for proper operation of
the secondary lightning protection and for proper operation of
the modules plugged into the enclosure. This ground connec-
tion should be made via a separate conductor to the
multi-ground neutral of the building ground.
Position
Label
Function
1
SHIELD
GND
Provides a ground connection point to the
incoming shield wires connected in pin 1 of the
Wirewrap Interface Card.
2
CHASSIS
GND
Provides a ground connection point for the metal
enclosure and DNI front panels.
3
+PWRB/
CKT GND
Provides a connection point for battery return and
connects to pin 17 of all slots. This terminal must
be connected to EARTH to maintain
lightning/overvoltage protection.
4
+PWRA
Provides a connection point for battery return and
connects to pin 17 of all slots. For back-up power
supply.
5
-PWRA
Provides connection point for -48V battery for
back-up power supply.
6
-PWRB
Provides connection point for -48V battery.
Table 1. TB1 Connections
3.5.3
Local AC Powering Ground Connections
When local AC is used with the 2555 Power Supply, the GRN/
YEL ground wire on the 2555 may be connected to the
enclosure’s chassis ground screw labelled POWER SUPPLY
CHASSIS GROUND" located in the center of the enclosure’s
rear back panel. This gives the customer an alternate means of
utilizing the outlet ground through the power supply cord.
