Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 183
If multiple sessions are open towards the local host, and each is receiving data, each
session’s data is queued and then sent over the serial link in round-robin fashion for
each session until no packets remain. When a packet is received over the serial link,
it is copied to each open TCP session and transmitted to the remote host.
3.6.6.3 Raw Socket Squelch Functionality
A condition may occur where the end device connected to the serial port continues
to send out a continuous stream of data after the normal response period has
expired. This can prevent the far-end remote host or master equipment from
receiving data from other end devices in the network. To resolve this condition, the
squelch command can be used on the raw socket at the port level (it is disabled by
default). This stops the socket from receiving any more data from the problematic
device.
If the command is enabled, the 7705 SAR will monitor the serial port for a constant
character stream. A configurable squelch delay period, using the squelch-delay
command, is used to determine how long to measure the constant character stream
before initiating the squelch function. If the squelch function is initiated, the port is
considered locked up and an alarm is raised indicating the lock-up and that the
squelching function has been triggered.
The serial port can be forced out of squelch and put back to normal, either manually
using the squelch-reset command or automatically using the unsquelch-delay
command. The unsquelch-delay command defines the time to wait after squelch is
initiated before it is removed.
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