17
MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR
4.4 Cable Connections
4.4.1 G
ENERAL
The Multiplexor has one standard DB25 connector, serving the main channel, and
two RJ-45 connectors for the sub-channels.
4.4.2 S
UB
-
CHANNEL
C
ONNECTIONS
Multiplexor sub-channel interfaces are configured as data communication
equipment (DCE) interfaces, thereby allowing direct connection, via RS-232 port
cables, to data terminal equipment (DTE). When modems are used to extend
range (tail-end circuits), crossover cables are required. Sub-channel interfaces are
asynchronous; therefore, clock signals are not supported or required.
4.4.3 M
AIN
(C
OMPOSITE
) C
HANNEL
C
ONNECTION
The Multiplexor composite channel interface is configured as a DTE interface,
intended for connection to a synchronous modem, that is capable of providing the
clock signal that determines the Multiplexor’s composite-channel data rate.
Appendix A
also lists the pin allocation for the main composite=channel
connector.
4.5 Power-On Procedure
To turn the Multiplexor on, connect the power cable to the Multiplexor power
supply, then plug the power supply unit into the mains. Plug the power supply into
the Multiplexor. The POWER indicator should light.
Check that after a few seconds (during which the Multiplexor performs a self-
test), the TEST indicator goes out. If the link to the far Multiplexor is not yet
operational, the TEST indicator will flash.
4.6 Configuration Information
The Multiplexor can operate in three modes:
1. Normal operation mode (described in detail in
Chapter 5
)
2. Parameter configuration mode
Allows user to set-up parameters of local and remote Multiplexor units. This
mode provides two types of functions:
