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Customs Over The Horizon Enforcement Network

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Revision as of 15:44, 11 February 2005 by Blantonl (talk | contribs)

COTHEN Network Frequencies

Frequency (Khz) Mode
---------------------------
5732.0		USB
7527.0		USB
8912.0		USB
10242.0		USB
11494.0		USB
13907.0		USB
15867.0		USB
18594.0		USB
20890.0		USB
23214.0		USB
25350.0		USB
COTHEN Terminal

The US Customs COTHEN Network uses a Rockwell/Collins ALE (Automatic Link Establishment) protocol to connect users to each other over the HF spectrum. If you listen to frequencies in use on the COTHEN network, you will hear the ALE sounding calls which units periodically and automatically initiate to determine the best frequency to use for calls to other units.

COTHEN Badge

The COTHEN network now uses the MIL-STD 188-141A protocol. It formally used the FED-STD-1045A ALE protocol, developed by Rockwell Collins. The FED-STD protocol is Rockwell Collins proprietary and goes by the tradename "Sel-Scan". It is no longer actively used by the COTHEN network.