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
A
CLK
B
S
–
L
A
N
NONCRITICAL
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
