ISDN-based VTC equipment supporting secure (classified) and non-secure (unclassified) conferences which implement dial isolators and A/B switches must meet minimum port-to-port isolation standards.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-43049	RTS-VTC 7420	SV-55778r1_rule	ECTC-1	Medium

Description
ISDN-based VTC system A/B switches, Dial Isolators, and/or other devices used to interface between RED and BLACK circuits/equipment shall exhibit the following port-to-port isolation characteristics, as applicable: • 100 dB over the baseband audio frequency range between 0.3 and 15 kHz. • 80 dB over the baseband video frequency range up to 5 MHz. • 60 dB over the frequency range from one times (Rd) to ten times the basic data rate (10Rd) of the digital signal(s) processed. DISN Video Services (DVS) maintains a list of A/B switches and Dial Isolators that have been TEMPEST certified to meet the above requirements at http://disa.mil/Services/Network-Services/Video/~/media/Files/DISA/Services/DVS/red_black_peripherals.xls

Description

ISDN-based VTC system A/B switches, Dial Isolators, and/or other devices used to interface between RED and BLACK circuits/equipment shall exhibit the following port-to-port isolation characteristics, as applicable: • 100 dB over the baseband audio frequency range between 0.3 and 15 kHz. • 80 dB over the baseband video frequency range up to 5 MHz. • 60 dB over the frequency range from one times (Rd) to ten times the basic data rate (10Rd) of the digital signal(s) processed. DISN Video Services (DVS) maintains a list of A/B switches and Dial Isolators that have been TEMPEST certified to meet the above requirements at http://disa.mil/Services/Network-Services/Video/~/media/Files/DISA/Services/DVS/red_black_peripherals.xls

STIG	Date
Video Services Policy STIG	2020-02-25

Details

Check Text ( C-49193r6_chk )
Review documentation to determine whether approved dial isolators and A/B switches are being used. DISN Video Services (DVS) maintains a list of A/B switches and dial isolators that have been TEMPEST certified to meet the above requirements at http://disa.mil/Services/Network-Services/Video/~/media/Files/DISA/Services/DVS/red_black_peripherals.xls. If the A/B switch or dial isolator is not on the list, this is a finding.

Check Text ( C-49193r6_chk )

Review documentation to determine whether approved dial isolators and A/B switches are being used. DISN Video Services (DVS) maintains a list of A/B switches and dial isolators that have been TEMPEST certified to meet the above requirements at http://disa.mil/Services/Network-Services/Video/~/media/Files/DISA/Services/DVS/red_black_peripherals.xls.
If the A/B switch or dial isolator is not on the list, this is a finding.

Fix Text (F-48626r6_fix)
Obtain and install DVS-approved dial isolators and A/B switches that maintain the following port-to-port isolation standards: • 100 dB over the baseband audio frequency range between 0.3 and 15 kHz. • 80 dB over the baseband video frequency range up to 5 MHz. • 60 dB over the frequency range from one times (Rd) to ten times the basic data rate (10Rd) of the digital signal(s) processed.