Installation Manual

1027144–0001 Draft – Revision D.01 3–34 Installing indoor RT equipment
RT installation
If more than 4 SSIs are required at a single site, or SSIs need to be
physically distributed (on different floors, for example), one or
more expansion IDUs (EIDUs) may be installed, at remote sites
only. A single IDU can accommodate up to 4 EIDUs (16 SSI slots)
as shown in figure 3-22.
EIDUs are linked to the IDU with fiber extender modules (FEMs).
These modules use multimode fiber to carry both ATM and TDM
traffic.
ODU
EIDU
FEM
4 SSIs
EIDU
FEM
4 SSIs
EIDU
FEM
4 SSIs
EIDU
FEM
4 SSIs
(In CCM slot)
IFL
Fiber
links
Maximum
link
distance:
2250 feet
(685.8
meters)
CCM
(In SSI slots)
IDU
4 FEMs
rt065
Figure 3-22 EIDUs used to distribute
SSIs throughout a remote site building
3.6
Installing expansion
IDUs (EIDUs)