Specifications

Appendix A
114
A.11.1 Functional Details
Fiber
The 155MS fiber to fiber 2R repeater uses a proprietary scrambled NRZ optical line coding to provide
extremely low BER for Voice over fiber.
A fixed transceiver or SFP models are available.
Management
The FRM220-155MS has a small processor that is used to communicate with the NMC. This model is NOT
designed for stand-alone use and should be installed in managed chassis.
When placed in a managed chassis, such as our FRM220-CH20 with NMC (Network Management Controller),
the 155MS card is 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. 155MS does NOT support in-band management.
There are two variations of this media converter; the 155MS converter with fixed optical transceiver or in an
SFP version.
A.11.2 Installation of SFP Modules
CTC Union supplied SFP modules are of the Bale Clasp type. The bale clasp pluggable module has a bale
clasp that secures the module into the SFP cage.
A.11.2.1 Inserting a Bale Clasp SFP Module into the Cage
Step 1 Close the bale clasp upward before inserting the pluggable module.
Step 2 Line up the SFP module with the port, and slide it into the cage.
A.11.2.2 Removing a Bale Clasp SFP Module
Step 1 Open the bale clasp on the SFP module. Press the clasp downward with your index finger.
Step 2 Grasp the SFP module between your thumb and index finger and carefully remove it from the SFP cage.
Figure A.11.2 Bale Clasp type SFP with bale open
A.11.3 Provisioning by DIP (Stand-alone)
There is NO DIP Switch installed on the PCBA of the 155MS