User manual

CONFIDENTIAL Protium Technologies, Inc. 4050-9901
Rev No: 05
5 GHz RF Modem 31-Jan-2007 12 of 84
This document and information contained herein is subject to the restrictions set forth on the title page .
or
> channel ethernet
as desired.
2.2.3.2 Serial Port
The DB-25 connector carries the serial data traffic. It may be configured through the software for either
synchronous or asynchronous operation at a variety of speeds, and for either EIA-530 or EIA-232 drivers and
receivers.
The serial port should be properly configured before connecting to external equipment.
2.2.3.2.1 Speed
Serial data may be either synchronous at 64 or 128 Kbps, or asynchronous at 300 to 19200 bps. The speed
selection automatically determines whether the protocol is synchronous or asynchronous.
Both ends of the link must be set to the same speed.
The speed and protocol may be set to 64 or 128 Kbps synchronous with the command:
> speed 64
or
> speed 128
The speed and protocol may be set to 300 to 19200 bps asynchronous with the command:
> speed 300
where the 300 may be replaced with 600, 1200, 2400, 4800, 9600, 14400, or 19200 as desired.
2.2.3.2.2 Clock Source
Synchronous serial mode requires the use of a data clock for both receive data and transmit data. The receive data
clock is always derived from the received signal and is provided by the modem. The transmit clock, however,
may be provided by one of three sources. With the clock set to internal, the modem supplies a clock at 64 Kbps or
128 Kbps depending on the speed setting. With the clock set to external, the customer equipment supplies a 64 or
128 Kbps clock that should match the speed setting. With the clock set to loop, the receive clock is also used for
the transmit side.
The clock mode of the modem at each end of the link must be configured appropriately depending on the clock
mode of the customer equipment to which it is attached. For example, if the customer equipment is generating the
transmit clock, the modem must use the external clock mode. On the other hand, if the customer equipment is
expecting the clock to be provided by the modem, then the modem must be set to internal clock mode. Each end
of the link may be configured independently to use internal, external, or looped clock, except that using looped
mode at both ends of the link is not recommended.
The clock source may be set with one of the commands:
> clock int
or
> clock ext