COMSPHERE 3600 Series Data Service Units
4-2 March 1999 3610-A2-GB41-60
Setup – DBM Rate Less Than DSU Rate 4-47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual DDS Restoration 4-47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LADS Operation 4-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Point-to-Point LADS 4-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bridged LADS 4-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bridged LADS Architecture 4-51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Bridge/DSU Interface 4-52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NMS Control 4-52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SNA Diagnostic Interface 4-53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LPDA-2 Addressing 4-53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assigning an Address to the Control DSU 4-53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assigning an Address to the Tributary DSU 4-54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NetView-Initiated Dial Backup 4-55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multipoint Dial Backup 4-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiplexing with TDM or MCMP 4-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Sharing 4-58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
A TDM can be configured to provide point-to-point
time division multiplexing, digital sharing, or digital
bridging capability. An MCMP can be configured to
provide point-to-point time division multiplexing,
multichannel multipoint multiplexing, or digital bridge
capability.
Network Terminology
Data transmission between 3600 Series DSUs and
compatible devices occurs in either of two ways:
point-to-point or multipoint. The device at the host
computer (or nearest to the host computer) end of a circuit
is designated the control. The devices on the other end are
designated tributaries.

Point-to-Point Transmission

In point-to-point transmission, there is one DSU at
each end of the digital facility. The control DSU and the
tributary may be 3600 Series DSUs or one of the other
devices listed in the DSU Compatibility section of
Chapter 1 of the COMSPHERE 3600 Series Data Service
Units, Models 3610 and 3611, Operator’s Guide.
A circuit employing point-to-point transmission is
referred to as a point-to-point circuit.