Area Of Application; Modes; Throughput Times - Siemens SCALANCE XCM-100 Equipment Manual

Area of application

SCALANCE XCM-100 media converters convert electrical signals into optical signals.
The media converters have two ports:
• Port 1 for electrical connections (100/1000 Mbps copper)
• Port 2 for optical connections (100/1000 Mbps SFP transceiver)
Individual, remote end devices or network segments can be connected via the optical port
of a SCALANCE XCM-100. With two coupled media converters, it is possible to integrate an
optical link into a redundant ring.
In addition, integration of the SCALANCE XCM-100 media converters into a standby coupling
is possible. This requires redundancy-capable stations, e.g. devices of the SCALANCE XM-400
series.
For more information, refer to "Network topologies (Page 14)".
3.1

Modes

There are two operating modes with SCALANCE XCM-100:
• Fast Ethernet
• Gigabit Ethernet
Depending on which SFP transceivers are plugged into a SCALANCE XCM-100, the operating
mode is set accordingly:
• SFP991-1* → operating mode Fast Ethernet
• SFP992-2* → operating mode Gigabit Ethernet
The media converter converts the frames without buffering them internally. Therefore, the
transmission speed for the optical and the electrical connection must be identical.
The link for the two ports of the media converter is only displayed when both sides of a
media converter have been connected correctly.
3.2

Throughput times

The SCALANCE XCM-100 media converters are characterized by a low and constant throughput
time. There are different runtimes for the operating modes.
Standalone operation
Direction
Receive optical → Send electrical
Receive electrical → Send optical
SCALANCE XCM-100 Media Converter
Equipment Manual, 12/2023, C79000-G8976-C659-03
Fast Ethernet
730 ns +/- 60 ns
910 ns +/- 60 ns
3
Gigabit Ethernet
195 ns +/- 20 ns
345 ns +/- 20 ns
11