Rockwell Automation Allen-Bradley SynchLink 1756-DM Series Design Manual page 103

Glossary 3
Core
The central cylinder of a fiber that is made of plastic or glass.
Daisy chain configuration
SynchLink configuration that begins with a master node and ends at
an end node. Center nodes may be used between the master and end
in this configuration.
dB
A unit of measure for loss or gain of power described as 10 × log
(Pout/Pin).
dBM
A power level referenced to 1mw, described as 10 × log
(Poptical/1mw)
Direct data
Data delivered in a single message. A SynchLink message can allocate
a maximum of four words. Direct data can be automatically forwarded
to the next node in the daisy chain configuration.
Disable keying
Option that turns off all electronic keying to the module. Requires no
attributes of the physical module and the module configured in the
software to match.
Download
The process of transferring the contents of a project on the
workstation into the controller.
Drive Communication
A fiber optic communications link that connects the Drive Module to a
Reliance Electric Power Module Interface (PMI) chassis.
Distributed Power System (DPS)
A family of Reliance Electric drive products.
Publication 1756-TD008A-EN-P - August 2002