Specifications

Appendix A
89
A.8.1 Functional Details
Fiber
The DATA 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-530 (including X.21 and RS-449), V.35 or RS-232.
The interface is also software selectable between DCE and DTE, which will eliminate using any special cross-over
or null-MODEM cables. The DATA card supports multiple options for clocking by using independent transmit and
receive clocks. This provides the ability to have synchronous transmissions with different bi-directional data rates.
This feature could be especially useful in satellite transmissions that may have different upstream and downstream
rate requirements.
A HDB26 female connector provides the data port connection with a variety of adapter cables. The DB25 cable
can be used for RS-530 or RS-232. The DB15 cable is for X.21. The DB37 cable is for RS-449. Finally, the MB34
cable is for V.35.
Management
The FRM220-DATA 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 or through a text based menu driven console when the
card is placed in the CH01M with DB9.
When placed in a managed chassis, such as our FRM220-CH20 with NMC (Network Management Controller),
the DATA 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. Serial console when placed in CH01M
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.8.2 Panel
Figure A.8.1 Panel designations of FRM220-DATA
There are two variations of this media converter; the DATA converter with fixed optical transceiver or in an SFP
version.