ADTRAN MX2800 M13 Figure 2-1. DC Power Connector, Table 2-1. DC Connector Symbol Definitions Symbol Definition, Frame Ground, alert user when connected to the 4175043L2 battery backup or equivalent system.

MX2800 M13 Multiplexer User Manual Installation and Operation, Section 2
61200290L1-1G 2-3
Figure 2-1. DC Power Connector
The following UL requirements must be met during installation of the MX2800 DC version:
1. Disconnect all power sources prior to servicing. Unit may use multiple power sources.
2. Input: Minimum 48 VDC, 0.8 amps
3. Input: Minimum 120 VAC, 0.32 amps
4. Connect to a reliably grounded –48 VDC source which is electrically isolated from the AC source. Use
24 VDC source for 1202289L3.
5. The branch circuit overcurrent protection must be a fuse or circuit breaker rated minimum 48 VDC,
maximum 20 amps.
Table 2-1. DC Connector Symbol Definitions
Symbol Definition
PWR FAIL Battery backup connector. If the AC fails, a trap is sent to
alert user when connected to the 4175043L2 battery
backup or equivalent system.
–Negative side of DC power source (usually –48 VDC)
RET Positive side of DC power source (usually ground)
Frame Ground
DC POWER 115 AC 50/60Hz
0.8A
PWR
FAIL +
TRSTR
CLK
ACLK B
S
–
L
A
NNONCRITICAL
DSX-1/E1
(OUT)
DSX-1/E1
(IN)
NO COM NC
CRITICAL
M
O
D
E
M
OUT IN
A
B
AB
DS3/STS-1
PWR
FAIL +
–
PWR
FAIL
+
USE COPPER
CONDUCTORS ONLY!
-48V 0.7A
+24V 1.5A
-48V 0.7A
+24V 1.5A