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5.2 Operating Instructions
After being prepared for operation as explained in
Chapter 4
, the MiniStat-Four
normally operates unattended. Operator intervention is required only when the
MiniStat-Four is set up for the first time or when your system configuration
changes. MiniStat-Four configuration is stored in nonvolatile memory and is not
affected when power is turned off.
5.2.1 P
OWERING
O
N
T
HE
U
NIT
To turn the MiniStat-Four on, connect the power cable to the MiniStat-Four jack,
then plug the power supply unit into the utility (mains) outlet. The SYNC indicator
should light.
If the link to the far MiniStat-Four is still not operational, the SYNC indicator will
flash. Wait until the link becomes operational, and check that the SYNC indicator
stops flashing and lights continuously.
Check that after a few seconds (during which MiniStat-Four performs its self-test),
the ERR indicator is extinguished.
5.2.2 N
ORMAL
O
PERATION
During normal operation, the SYNC and MAIN indicators should light
continuously, and the TEST and ERR indicators must remain off.
Sub-channel activity indicators flash according to the traffic load and go out when
the sub-channel is idle.
NOTE
When the TEST indicator lights, traffic is interrupted, even if all other
indications are normal.
On noisy links, the SYNC indicator may flash from time to time; this indicates
automatic retransmission of a data frame. Automatic retransmission occurs when
the remote MiniStat-Four requests it. The request is sent when errors are detected
in the received data, and it ensures that only valid data is transmitted.
5.2.3 P
OWERING
O
FF THE
U
NIT
To turn the MiniStat-Four off, disconnect the wallmount power supply from the
utility (mains) outlet, then disconnect, if required, the power cable from MiniStat-
Four jack.
CHAPTER 5: Operation
