-610 TELEPHONE COMMUNICATION
[91 Kb]

-620 NON-SECURE CIRCUITS
[108 Kb]

-630 SECURE TELEPHONE EQUIPMENT
[88 Kb]

-640 INTERNATIONAL VOICE GATEWAY
[102 Kb]

-650 SATELLITE COMMUNICATION
[87 Kb]

[This is a mobile copy of 600 MANAGING TELEPHONE NETWORKS]