15
CHAPTER 3: Installation
3.5.3 I
NSTALLING THE
S
TAT
-24
The rack adapter kit for Stat-24 rack installation includes two short brackets. The brackets are fastened via
screws to the two side walls of the case, as shown in Figure 3-5. To prepare the mux for rack installation, attach
the two brackets to the side walls of the mux. Each bracket is fastened with two screws (with flatwashers), which
are inserted into the two front holes on the side wall (nuts are already in place, on the inner side of the wall).
After attaching the brackets, the mux is ready to install in the 19" rack. Fasten the brackets to the side rails of
the 19" rack with four screws (not included in the kit), two on each side.
Figure 3-5. Installing the Stat-24 in a 19" rack.
3.6 Cable Connections
3.6.1 G
ENERAL
The Stat-4, Stat-8, and Stat-24 have one standard DB25 connector, serving the main channel, located on the
rear panel, and RJ-45 connectors, located on the front panel, for the sub-channels.
3.6.2 S
UB
-C
HANNEL
C
ONNECTIONS
Stat mux sub-channel interfaces are configured as data communication equipment (DCE) interfaces, allowing
you to connect the mux, via RS-232 port cables, directly to data terminal equipment (DTE). When you use
modems to extend range (tail-end circuits), you need crossover cables. Sub-channel interfaces are
asynchronous, so clock signals are not supported, or required.
Appendix A
lists pin allocation in stat mux
sub-channel connectors and provides typical wiring diagrams for straight-through and crossover cables.
3.6.3 M
AIN
(C
OMPOSITE
) C
HANNEL
C
ONNECTION
The stat mux’s composite channel interface is configured as a DTE interface. It connects to a synchronous
modem providing the clock signal that determines the stat mux’s composite channel data rate.
Appendix A
also
lists the pin allocation for the stat mux’s composite channel connector.
