User's Manual

1027144–0001 Revision D 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.
Fiber extender modules (FEMs) and multimode fiber cable are
used to link EIDUs to the IDU. The FEM links carry both ATM
and TDM traffic.
Refer to the site plan to determine how many EIDUs are to be
installed and where they are to be installed.
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
The EIDU can be used on a tabletop or installed in a 19–inch
(48.3–centimeter) rack. With optional adapter brackets, the EIDU
can also be installed in a 23–inch (58.4–centimeter) rack.
Note: HNS does not provide a rack for EIDU installation.
If you are installing the EIDU in a rack, refer to the prerequisites,
safety guidelines, and instructions provided on pages 3–4
through 3–7.
3.6
Installing expansion
IDUs (EIDUs)
Mounting options
Rack mounting