American Fibertek RT-88 Specsheet
88
SERIES
8 CHANNEL “SUPERVISED” EXTERNAL
CONTACT CLOSURE SYSTEM
Features:
8 Channels, Form-C (Normally Open or
Normally Closed) Dry Contact Closure
Diagnostics: Power, Optical Presence
and Channel Indicators
High Density DB26 Data Connector with
Adaptor to screw terminal
External Contact Input Supervision
Specifications:
Contact Input:
-Supervised External Contact Closure
-Requires 1Kohm Series resistor near the
remote contact
-A Contact State is determined to be open
(off) when the voltage at the MT/RT-88
input differs from a predetermined range
-A Contact State is determined to be closed
(on) when the voltage at the MT/RT-88
input falls within a predetermined range
-If the MT/RT-88 loses power or the fiber is
cut / disconnected, the MR/RR-88 contacts
will open and an alarm condition will be
indicated.
-If the MR/RR-88 loses power or the fiber is
cut / disconnected, the MR-88/RR-88
contacts will open and an alarm condition
will be indicated.
-TVS Transient Voltage Suppression Diodes
(Used on all Contact Inputs)
-Connector ....................DB26 with Adaptor
to Screw Terminal
Contact Output:
Contact Closure Rating...............0.5A Max.
40 Volt DC or Peak AC Per Channel
Response Time...................................5 ms
Connector .....................DB26 with Adaptor
to Screw Terminal
Optical:
Wavelength....................................1310nm
Loss Budget (62.5/125µ)....................12 dB
Connector .............................................. ST
Temperature (Operating)
-40°C to +75°C, non-condensing
Power Supply:
Module – 12 VDC (AFI Part # PS-12D)
Rack Card – AFI SR 20/2
Size:
Module ..........................81/8” x 41/8” x 11/8”
Rack Card (1 rack slot) ............6½” x 5” x1”
Product Ordering Information:
MT = Module Transmitter –Signal Source
MR = Module Receiver –Signal Receive
RT = Rack Card Transmitter - Signal Source
RR = Rack Card Receiver – Signal Receive
Example: MT-88 to RR-88
Optional:
Adding -293 to the MR-88-293, RR-88-293
part number adds a dry contact (relay)
output which detects (opens) loss of dc
power or optical power.
10/06/2014
The American Fibertek 88 Series multiplexes 8 channels of
“supervised input” dry contact closure on one multimode fiber. A set
of 8 LEDs on the transmitter and the receiver units indicates the
channel(s) status.
The Contact Input supervision will detect an open connection and a
shorted connection as an alarm. The alarm condition is removed
only when the Contact Input voltage falls within a predetermined
range.
Failsafe operation is provided such that, if the optical po wer is loss
or the transmitter or receiver dc power is loss, the normally open
contact outputs will go to the alarm states (open).
Diagnostic indicators provide a quick visual indication of system
status. The “Afinety” intelligent remote monitoring system is
available on the Rack Card product, please consult factory.
Equipment may be ordered as stand alone modu les or rack cards
that are mounted in the American Fibertek Card Cages: SR-20/2 or
SR-20H/2 (redundant power supply).
CONTACT
INPUTS
“Supervised”
Channel 1
to
Channel 8
MT-88
or
RT-88
ONE
MULITMODE
FIBER
MULTIMODE
CC
8 -->
MR-88
or
RR-88
CONTACT
OUTPUTS
Channel 1
to
Channel 8
Optional -293
Relay Output
Detects Loss of
DC Power and
Optical Power
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