Multi-Tech Systems Multi-Tech MultiFRAD 100-Series FR111 User Manual

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The Sync Data Port Configuration menu allows you to configure the
data port for either asynchronous or synchronous operation, depending
on the type of device connected to the port.

When the port is configured for synchronous operation, the following
Data Port Configuration menu displays the default parameters:

Data Port Configuration

1 - Async/Sync:               Sync
2 - Speed:                    57600
3 - Idle Condition:           Flags
4 - NRZ/NRZI Encoding:        NRZ
5 - CRC Preset:               All 1s
6 - Inter-frame Timer:        Off
S - Store All Configurations
M - Main Menu
P - Previous Menu
Selection : _

The Async/Sync option configures the port for either asynchronous or
synchronous operation. When a synchronous device such as a LAN
bridge or router is connected to the port, the data port needs to be
configured for synchronous operation.

The Speed option needs to be set to match the speed of the sync
device.  When the data port is connected to a synchronous device, the
baud rate is from 300 bps up to 128K bps.  The default channel speed is
56K bps.

The Idle Condition option must be set to match the idle condition of the
synchronous device connected to the data port.  The idle condition
determines what happens when the synchronous data line is idle (i.e.,
no data frames are being transmitted).  The default condition is to
continuously send SDLC flags (Flags).  The other idle condition is the
mark state (Mark).  The transmit LED will be off during idle time if the
synchronous device is in the mark state during idle conditions.

The NRZ/NRZI Encoding option refers to the fact that synchronous data
can be encoded by using either the NRZ (Non-Return to Zero) or NRZI
(Non-Return to Zero Inverted) method.  This option must match the
synchronous device’s encoding.  The default is NRZ.  With NRZ encod-