Specifications

B-6
Appendix B - ELMo 120 Multiplexer cablin
g
specifications
Revision 2.01 ELMo 120 Multiplexer Installation and Maintenance Guide 08-01023-01
ELMo 120 Multiplexer power cable
Figure B-4 shows the ELMo 120 Multiplexer cable harness. The ELMo 120
Multiplexer power cable assembly connects the -48 V dc power source to the
ELMo 120 shelf. One ELMo 120 Multiplexer power cable harness contains
connectors to support three ELMo 120 shelves.
Figure B-4
ELMo 120 Multiplexer power cable harness
Power connector terminations
The end of the ELMo 120 Multiplexer power cable assembly that connects to
the power source has two red and two black leads. Each lead is terminated with
24-4 ring clips. The ELMo 120 power cable assembly must terminate at the
-48 V dc power source as shown in the following table:
ELMo 120 power cable
connector
Power source Terminal connection
Red (2) -48 V dc supply Ne
g
ative (-)
Black (2) -48 V dc return Positive (+)
!
CAUTION
Serious equipment damage
Reversed polarities on the power feed can irreparably
damage the ELMo 120 shelf components. Be certain
power feeds are connected properly to the power
source, with the red leads connected to the -48 V dc
supply
as shown in the table above. Note that this is
the opposite of other (non-telecommunications)
applications, in which red leads are usually
connected to the "+" terminal.
Mate-N-Lok
Connector (4-prong)
Red and black
ring clip leads (4)
(Two not shown)