Figure 2-1. Dc Power Connector; Table 2-1. Dc Connector Symbol Definitions - ADTRAN MX2800 User Manual

The chassis should be connected to an earth ground using the ground stud
located between the AC and DC power sources on the rear panel.
PWR FAIL Battery backup connection. If AC fails, a trap is sent to
61200290L1-1

Table 2-1. DC Connector Symbol Definitions

Symbol
alert user.
- Negative side of DC power source (usually -48V)
RET Positive side of DC power source (usually ground)
Frame Ground
MX2800 User Manual
Chapter 2. Installation and Operation
PWR PWR
FAIL FAIL

Figure 2-1. DC Power Connector

Definition
2-3