Technical Manual

Preliminary Release

14. The 2788 can operate using the AES256 encryption standard with the following

commands:

ee=0<CR> no encryption

ee=1<CR> AES256 encryption

No encryption results in the least number of extra characters appended to a message.

This minimizes transmission latency. Encryption will pad extra randomized characters to

create standardized message segment lengths of 128 bits. The pad characters are

removed at the receiver.

The AES256 standard uses a 256-bit key. The key is generated from a user generated

phrase. This phrase can be up to 32 case sensitive characters. It is entered with the

command: aesp=### . . . ###<CR>. The phrase is converted into a 256 bit key using the

SHA256 secure hashing algorithm. This key is used by the AES256 encryption and

decryption algorithms.

15. Should it be necessary, the transmitter can be disabled with the command: et=0<CR>.

To re-enable the transmitter: et=1<CR>.

4.0 Front Panel Indicators

The six front panel LEDS are defined in Table 1:

LED

Description

PWR

On when 12 Vdc power is applied.

RXD1

On when receive data is active.

RXD2

On when diagnostic receive data is active.

DCD

On when receive data preamble is detected.

TXD1

On when transmit data is active.

TXD2

On when diagnostic transmit data is active.

Table 1 LED Definition

The LEDs show the status of both Ethernet and RS-232 serial data. Diagnostic data occurs during

Telnet sessions.