User's Manual

SELEX Communications
Information contained in this document may not be used, applied or reproduced for any purpose unless agreed
by SELEX Communications S.p.A. in writing
25
July 2010
4W cabling example: link between RBS A and RBS B
RJ-45, RBS A side RJ-45, RBS B side
M (+) 1 Not connected Not connected 1 M (+)
M (-) 2 Not connected Not connected 2 M (-)
E (+) 3 Not connected Not connected 3 E (+)
AF_OUT (-) 4 White-blue White-orange 4 AF_OUT (-)
AF_OUT (+) 5 Blue Orange 5 AF_OUT (+)
E (-) 6 Not connected Not connected 6 E (-)
AF_IN (-) 7 White-orange White-blue 7 AF_IN (-)
AF_IN (+) 8 Orange Blue 8 AF_IN (+)
E/M Hardware Line settings
All the E/M signals share a common voltage reference. The four Mouth signals may be hardware
configured independently. The four Ear signals share the same hardware configuration in couple of
lines. For unbalanced settings connect the two communicating entities to the same ground.
E/M Type I Interface Model
E/M Type I is the original E/M lead signaling arrangement and it is the most common interface type in
North America. The following diagram displays the sent signal states for active/not active signaling.
The RBS grounds its M−lead to signal a seizure. The other device applies battery to its M−lead to
signal a seizure. The RBS expects to see active conditions on the E−lead and signal active to the
remote device on M−lead.
E/M Type II Interface Model
E/M Type II provides a four−wire fully−looped arrangement that provides full isolation between the
trunks and signaling units. The following table displays the sent signal states for active/not active
signaling. The RBS grounds its M−lead to signal a seizure. The other device applies battery to its
M−lead to signal a seizure. The RBS expects to see active conditions on the E−lead and signal active
to the remote device on M−lead.
RBS side