ABB Relion 670 series - Line data communication module (LDCM); Introduction; Design

19.2.17 Line data communication module (LDCM)
19.2.17.1 Introduction
The line data communication module (LDCM) is used for communication between the
IEDs situated at distances <68 miles or from the IED to optical to electrical converter
with G.703 interface located on a distances <1.9 miles away. The LDCM module sends
and rereceives data, to and from another LDCM module. The IEEE/ANSI standard
format is used.
The line data communication module is used for binary signal transfer. The module has
one optical port with ST connectors see figure 536.
Line data communication module LDCM
Each module has one optical port, one for each remote end to which the IED
communicates.
Alternative cards for Long range (1550 nm single mode), Medium range (1310 nm
single mode) and Short range (850 nm multi mode) are available.
Class 1 laser product. Take adequate measures to protect the eyes.
Never look into the laser beam.
19.2.17.2 Design
The LDCM is a PCMIP type II single width format module. The LDCM can be
mounted on:
• the ADM
• the NUM
1MRK505222-UUS C Section 19
IED hardware
1123
Technical reference manual