Telenetics RM16M - Versatile Rack Mounting Chassis, Installation And Operation Manual, Page: 31 / 49

Page 31
Special Assemblies
The Data Shelf can be configured with assemblies that enhance or
modify the operation of the basic modems. The operation of the
special assemblies is explained in the manual for the associated
equipment.
Some special assemblies are:
v
801 Automatic Call Unit (ACU)
Used with PSTN-type modems to establish automatic data calls
on a dial-up network. To use an ACU, the Data Shelf must be
equipped with a segmented back panel.
v
720 Dual Dial Backup Unit (DDBU)
Used to establish dial backup for leased-line modems. To use a
DDBU, a segmented backplane is required.