Verilink AS56/56Plus (896-502588-001) Product Manual - Manual (Page 14)

Overview
1-2 AS56 and AS56 Plus User Manual
Centum 56 Series Product
The Centum 56 Series product line includes the following specially
featured unit types:
Access System 56 Plus (AS56 PLUS). A Centum 56 Series unit which
can be converted from a 56/64 kbps DDS unit to a T1/FT1 unit. This can
only be done by utilities configuration selection on the user's terminal
screen (See Chapter 6, Auxiliary Ports).
Access System 56 (AS56). A Centum 56 Series unit which operates
in56/64 kbps DDS Mode only.