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USA NSA FILL Crypto Radio DS-102 →
DS-101 is described in the EKMS 603 standard, but unfortunately this
standard is not publicly available. It is known however, that DS-101 is
an asynchronous serial protocol running at 64 kb/s.
The physical interface is commonly implemented as RS-485, but RS-232D
versions are known to exist as well, which can be useful for application
in Personal Computer (PC) based environments.
In most cases, devices that support newer DS101 – with an anynchronous
RS485/RS232 interface – still support the older synchronous interface
and are therefore backward compatible with DS102.
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Unlike the DS-102 standard
— which can only transfer cryptographic keys
and frequency hopping tables — DS-101 can differentiate between various
key and data types by using data tagging. As a result, DS-101 can also
be used for distributing firmware and cryptographic algorithm updates.
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DS-101 fill units on this website
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DS-101 compatible devices on this website
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For connection between the FILL unit, and a radio or encryption device,
most devices used a standard
U-229 connector.
In many cases, this connector is shared with the audio functions
of a military radio,
for example for the connection of a handset.
This connector has 5 or 6 spring-loaded contacts, and is available
in a male and female variant, as shown in the diagram below.
Although each variant has its own specific type number, they are often
referred to as U-229/U, or simply U-229, after the female 5-pin cable
part. The table below shows the pinout of this connector for the DS-102
standard. On encryption devices this connector is commonly used exclusively
for the FILL function, but on radio sets it is often shared with the audio functions.
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Pin
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DS-101
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Description
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Note
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A
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GND
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Ground (common wire)
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B
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RTS
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Request to Send
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C
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RX
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Data out of radio or crypto device
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D
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TX
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Fill data into radio or crypto device
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E
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CTS
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Clear to Send
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F
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-
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-
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Interface RS485 and/or RS232D Type Asynchronous Baudrate 64 kb/s Handshake RTS/CTS Protocol HDLC
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At present, not much is known about DS-101, EKMS-603 and the underlying
data structure. You can help us to expand this page by providing additional
information about transfer devices that use DS-101, supported radios,
supported encryption devices, and the underlying data structure.
➤ Contact us
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© Crypto Museum. Created: Sunday 11 February 2018. Last changed: Wednesday, 24 August 2022 - 20:01 CET.
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