Specifications

Appendix A
100
A.9.1 Functional Details
Fiber
The Serial fiber modem uses a proprietary scrambled NRZ optical line coding to provide extremely low BER for
Serial Data over fiber.
The electrical interface is software selectable between RS-232 3-wire or 5-wire and RS-485 4-wire Full Duplex
or 2-wire Half Duplex interface.
A 6-Pin Terminal block provides the interface port connections.
Management
The FRM220-Serial has a small processor that is used to read the on-board DIP switches. When used stand-
alone, the configuration can be done via the DIP switches.
When placed in a managed chassis, such as our FRM220-CH20 with NMC (Network Management Controller),
the Serial card and remote are configured and monitored through the chassis NMC via console, Telnet, Web HTTP
or SNMP.
1. Stand-alone – DIP settings when placed in CH01.
2. Rack management - When placed in NMC managed rack, all other settings can be overridden by the NMC management.
3. DATA supports in-band management.
A.9.2 Panel
Figure A.9.1 Panel designations of FRM220-Serial
There are two variations of this media converter; the Serial converter with fixed optical transceiver or in an SFP
version.
Fiber Optical Transceiver
LED Indicators
Power
DO
6-Pin
terminal
block
R
X
T
X
6
1
SERIAL
FX Link
Test
DI