Installation Instructions for FRM220-FXO/FXS
FXO/FXS POTS Over Fiber Optic
Slide-in-Module Media Converter

Description
CTC Union’s FRM220-FXO/FXS POTS over fiber media converter connects central-office
voice grade signal to distant POTS (Plain Old Telephone Service) equipment using
standard telephone signaling. It can extend, over fiber, the distance between two voice
path communication devices by up to 120km using single mode fiber.
The FRM220-FXO/FXS provides audio transmission, caller ID, ringing at the distant end
and automatic ring down. Two units are required to implement an end to end system. The
RJ-11 connector provides the electrical interface between the media converter and thetelephone device or PSTN.
The FRM220-FXO/FXS is designed to be installed in FRM220-CH20 (20 slots Chassis) for
CO side or installed in FRM220-CH01(1 slot Chassis) for CPE stand-alone.

DC Jack

External DIP
Switches

RJ11C
Connections

Fiber
Connections

Technical Specifications
Copper Connector
FXO/FXS :Phone Connector :FXO Mode
Impedance :Coding :Loop Current :Ring Frequency :Insertion Loss :FXS Mode
Impedance :Coding :Dial :
Battery Source :Ringing Waveform :Ringing Supply :Ring Frequency :Ring Cadence :Selectable
RJ-11C
600 ohm
16 bits linear
10 ~ 100mA
Acceptable 20 ~ 55Hz
0.0r 1.0dB at 1000Hz
600 ohm
16 bits linear
DTMF and Pulse Dial
48VDC r 4V
Sine wave
60Vrmsr 10%
20/25/30/35/40/45/50/55 Hz selectable
FXS to FXS : On / 1 second, Off / 2 second
FXO to FXS : Reproduces the cadence of FXO
0.0r 1.0 dB at 1000Hz
4.0B (Ring Equivalence Number)

Insertion Loss :REN:
Fiber Optic Connectors
Two connectors are provided for fiber optic cable connection.
One is labeled "TX" for transmission of optical data, the other is labeled "RX" for receptionof optical data.

DIP Switch Setting (for firmware version 3.03)
DIP SW State-1-2

Main Modesetting

OFFOFFFXS Mode
20~35HzONFXS Mode
40~55HzON

ON

General Specifications
Environment•Operating Temperature : 0 - 50 ɗ
•Storage Temperature : -10 ~ 60 ɗ
•Humidity : 5 ~ 90% non condensing
Power•DC +12V / 800mA input•Power Consumption : 5 W

Dimension & Weight•88mm x 137mm x 20.8mm (Line card)(WxDxH)•Weight : 450g

OFF-3
OFFON
OFFON
OFFON
OFFON

DIP SW State-4
OFFOFFON
ONOFFOFFONON

OFFOFFON

OFFOFFONONON

FXO ModeSub-function
Ring frequency, 20Hz
Ring frequency, 25Hz
Ring frequency, 30Hz
Ring frequency, 35Hz
Ring frequency, 40Hz
Ring frequency, 45Hz
Ring frequency, 50Hz
Ring frequency, 55Hz
Ring frequency,
20/25Hz
Ring frequency,
30/35Hz
Ring frequency,
40/45Hz
Ring frequency,
50/55Hz

When installing with NMC in CH20, the NMC-R2 version must be 3.26 or above to manage these settings.
As with all FRM220 series products, once installed in the managed chassis, the DIP settings have no effect.
All setting is then performed via the Network Management Controller (NMC) of the chassis.

V.: 3.2

Installation
Connect the RJ-11 cable to the FRM220-FXO/FXS. The converter should be setup tooperate in FXO or FXS mode and the fiber link will be indicated on the LED. Follow theconnection examples below. Install the fiber converter with the DC power adapter provided(+12VDC, 800mA) and connect the adapter to an AC outlet .

Connections
The following example illustrates the connection scheme when connecting PBX or PSTN
to telephone through the fiber converter.
FXO

Fiber Cable

FXS

PBX

Telephone

The following example illustrates the Automatic Ring-Down connection scheme (Hot Line)
when connecting telephone to telephone through the fiber converter.
FXS

Fiber Cable

Telephone

PWR

FXS

TelephoneTEST
LNK ACTLED Indicators
LEDPWR
LNK
ACT

TEST

Function
State
Power Indicator Green
Off
Fiber Link
Green
Off
Phone Status Green
OffFlash
Test Status
RedStatus
Converter has power.
Converter has no power.
The fiber link is ok.
No link or the link is faulty.
Activity.
Idle.
Ringing.
When in any loop back mode

Memo Note