Title

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. (Cat II impact)

Discussion

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

Check Content

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

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.

Additional Identifiers

Rule ID: SV-55778r1_rule

Vulnerability ID: V-43049

Group Title: RTS-VTC 7420 [ISDN]

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.