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MIL-STD-187-31O
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10.1.3
General Performance Requirements
10.1 .3.1 InteRrated Concept. The Unified Digital Switch (UOS) will
integrate .a variety of modes such as voice, graphics, and interactive
data traffic. Three different approaches to communications systems
are currently in general use: circuit switching for voice traffic,
message switching for record traffic, and packet switching for data
traffic. Each approach is generally responsive to its user’s requirements when properly implemented. However, use of transmission facilities and interaction betveen different terminal types can be greatly
increased if these approaches are combined into a single integrated
communications sys tern.
10.1.3.2 Imuroved System Availability. The brute force way of dealing vith systam availability is to provide sufficient capacity to
handle worst-case loading on each subnetwork (e.g., AUTOVON, AUTODIN.
AUTOSEVOCOM) . An alternative is to provide a distributed capacity
switched network which encompasses all such networks and which can
readily adapt to changing traffic patterns witbfn and across each network. Such an approach provides more graceful degradation vitb more
efficient use of costly resources and transmission capability.
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10.1.3.3 Improved System Versatility. The UDS must have the capability to handle a variety of data framea, line speeds, and formats.
Line fb”rm.atsinclude binary, packed binary, and character. The types
of users will vary from very slow terminals to wideband video, and
the OUS must have the capability to provide services ‘to these types of
users in an efficient way, in both the backbone and access areas.
Future digital voice terminals may also require different transmission
rates as capabilities in this area evolve with time. These rate
variations can be mast readily accommodated on a nonchannelized,
switched network structure.
10.1 .3.4 Mixed Mode Transactions. A Unified Digital Switch will also
provide greater flexibility for cervices in that it can readily provide
interconnection between completely different terminal modes; e.g. , use
of’voice in an interactive mode with computers, and possible use of
both CRT terminals and voica in a working group conference. Msn-machine
interactions may also require the UDS to handle voice in one direction
sand digital data in the other.
10.1 .3.5 Rapid Message Svstem. The capability should exist for very
short important Interactive messages to be transmitted quickly (in a
few seconds) to ensure an equally responsive reply.
10.1.3.6 End-to-End Security. The UDS shall provide an Integrated
solution in facilitating end-to-end security. This includes the areas
of subscriber (terminal device) protocols, key variable distribution
1o-1-3
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