DS-120MDR
Self-Healing Multi-Drop
Ring/Bus Topology
RS-232/422/485 Multi-Drop System
The DS-120MDR multi-drop fiber optical data sets are
designed to connect multiple equipment with the RS-
232/422/485 2- or 4-wire interface. The data sets
consist of one Master unit and at least one Slave. Both
Master and Slave units provide one port with Async
data rates up to 125 Kbps NRZ, and 1
7
/8” x 17”
character LCD status display on any remote unit,
achieving full diagnostics with no PC. The Master unit
has one optical channel and the Slave unit has two
optical channels —A and B.
The DS-120-MDR is ideal for traffic control, industrial
process control, and security systems that are
configured for bus or ring topologies. The fiber
modems regenerate fiber optic signals and provide
greater system loss budgets and increased distances.
System Design
The DS120-MDR series is connected to SCADA, ITS,
card access systems, CCTV and security host poll
equipment through the RS-232/422/485 interface. It
transmits the host’s data and control signals on the
optical channel to all the Slave units. Each unit has
built-in dual power redundancy with alarm back-up
battery.
DS-120-MDR-B: In Bus configuration, the Slave unit
receives data/control signals from the SCADA host’s
channel A, and loops through channel B to the next
Slave unit. Slave responds with an RTS signal.
DS-120-MDR-R: In Ring configuration, channel B can be
used as a counter-rotating ring. The SCADA host polls
every Slave, the Slave responds by an RTS signal, then
transmits data/control signals on channel A instead of
looping through channel B.
Features
• Master / Slave multi-drop system
• Choice of RS-232, RS-422 or RS-485 EIA interfaces
• Bus or Ring system topology with anti-streaming
• Async data rates up to 125 Kbps
• 3-35 km range full-duplex fiber
• Multimode or Singlemode operation over two fibers
• Self-healing and diagnostic display capability
• Compatible with ONS PC-based network management
Optical
Loss
Budget
18 dB
865
1310
1550
Type
LED
Mode
MM
Wavelength
Suffix
L0
Fiber
Type
50 /125µ
62.5/125µ
Output
Power
-16 dBm
Receiver
Sensitivity
-34 dBm
Range*
3 km
Conn
Type
ST
•
•
•
•
•
•
LED
MM
L1
50 /125µ
62.5/125µ
-16 dBm
-34 dBm
18 dB
4 km
ST
Laser
Laser
SM
SM
L2
L3
09/125µ
09/125µ
-10 dBm
-10 dBm
-34 dBm
-34 dBm
24 dB
24 dB
25 km
35 km
FC
FC
* Chromatic dispersion and additional losses should be taken into account
800-867-8426 • info@opticomm.com • www.opticomm.com • Contact Opticomm for custom requirements.
Opticomm reserves the right to change specifications without notice
OPTICOMM [ Opticomm Corporation ]
