Grounding Considerations; Ethernet Data Interface (Rj-45) - GE MDS SD Series Technical Manual

NOTE Early SD4 models supported 10.5 to 16 VDC power, not 10 to 30 VDC. Always check
the labeling above the power connector to confirm the operating range for your unit.
A power connector with screw terminals is provided with each unit (see Figure 17). Strip the
wire leads to 6 mm (1/4 inch) and insert in the wire ports, tightening securely. Be sure to observe
proper polarity as shown in Figure 17.
Figure 17. DC Power Connector (P/N 73-1194A39)
NOTE The radio is designed for use in negative ground systems only.

4.5 Grounding Considerations

To minimize the chance of damage to the transceiver and connected equipment, a safety ground
(NEC Class 2 compliant) is recommended which bonds the antenna system, transceiver, power
supply, and connected data equipment to a single-point ground, keeping all ground leads as short
as possible.
Normally, the transceiver is adequately grounded if the supplied flat mounting brackets are used
to mount the radio to a well-grounded metal surface. If the transceiver is not mounted to a
grounded surface, it is recommended that a safety ground wire be attached to one of the mount-
ing brackets or a screw on the transceiver's case.
The use of a lightning protector is recommended where the antenna cable enters the building;
bond the protector to the tower ground, if possible. All grounds and cabling must comply with
applicable codes and regulations.

4.6 Ethernet Data Interface (RJ-45)

The transceiver's Ethernet Port is used to connect the unit to another Ethernet device. The port
has built-in MDIX (auto-sensing) capability, allowing either a straight-through or crossover ca-
ble to be used. Figure 18 and Table 6 show pinout data for the Ethernet port. The Ethernet inter-
face supports both radio management and payload data transport functions.
For radio management, connecting via a web browser provides enhanced functionality and ease-
of-use over serial ( ) methods or Telnet. Web-based management is the preferred and prima-
COM1
ry means of accessing the transceiver through the built-in Device Manager.
20 SD Series Technical Manual MDS 05-4846A01, Rev. I