User's Manual

MDS 05-6399A01, Rev. D MDS Master Station 55
MDS x710 radios). In such networks, the Remote radios should have the Switched Carrier setting turned
ON. The default setting is OFF which assumes B-modem operation with a continuously keyed Master.
Ckey Operation only applies to Master units operating in full-duplex mode only. When operating
continuously keyed, latency is decreased and AFC operation on legacy remotes may be improved.
Switched carrier operation, when low latency is not required, is recommended when operating in high
ambient conditions to reduce power consumption and heating.
Force DCD to Asserted – Some systems require a constant Data Carrier Detect (DCD) signal. This
setting allows the radio to be configured to provide a DCD signal without the need for special cabling.
NOTE: Enabling Force DCD to Asserted will cause the RX LED on the radio interface to turn on,
regardless of whether the radio is receiving data or not.
Data Key Hold Time-out – When operating in data key mode, this parameter specifies the number of
character-times the transmitter will remain keyed for after the last character it receives. For networks with
the demand for a higher modem speed then the baud rate, this parameter can be adjusted from 1 to 10
characters. This parameter gives the overall network better performance by preventing frequent key-up
and key-down sequences between characters. This only applies to networks with all SDx radios.
Simplex Mode – This controls whether or not the Master Station will be running in simplex (switched
carrier) or full duplex mode. If the Master Station is transmitting and receiving on the same frequency,
this must be set to true.
Dlink Mode (B Modems) – Legacy products that only support B-Modems do not have support for Dlink.
Newer products such as the MDS SD have the ability to support Dlink even when using B-Modems.
Depending on site-specific requirements, this value may need to be changed to ‘bypassed’ in order to
work with legacy products. It is recommended to leave this value set to ‘auto’ unless there is an explicit
need to change it.
Rx Mute – The number of milliseconds to mute the receiver after transmitting data. Receive muting
might be required when you configure the radio as a full-duplex polling remote communicating through a
repeater. It prevents the radio from hearing its own transmissions ('echoes') from the repeater, which
might cause software application errors.
5.6.5.1.5 SetEncryptionPhrases
Clicking on the Set Encryption Phrases action will allow you to enter the following values:
Payload – The payload encryption passphrase. Both the sending and receiving stations must have the
same phrase for communication to occur. The phrase must have at least 8 characters (maximum of 38).
Any printable characters may be used.
Dlink – The Dlink encryption phrase when operating in transparent mode w/ AES encryption enabled.
Dlink encryption in transparent mode requires a device supporting this feature at both ends of the link. In
addition, both the sending and receiving station must have the same phrase for communication to occur.
The phrase must have at least 8 characters (maximum of 38), and any printable character may be used.