Spec Sheet
81B-SL
SERIES
SINGLEMODE
Features:
4 Channels Bi-Directional, Form-C
(Normally Open or Normally Closed) Dry
Contact Closure
Latching Relays reduce power
requirement
User-Selectable feature maintains
Contact Status through Power-Cycle
and Loss-of-Optical-Power.
User Control to Reset all Contact Status
Diagnostics: Power, Optical Presence
and Channel Indicators
High Density DB26 Data Connector with
Adaptor to screw terminal
Specifications:
Data:
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 ......................... 1310/1550 nm
Loss Budget (9/125µ) ....................... 12 dB
Connector..............................................FC
Temperature (Operating)
-40°C to +75°C, non-condensing
Power Supply:
Module – 12 VDC (AFI Part # PS-12+)
Rack Card – AFI SR 20/2
Size:
Module ......................... 81/8” x 41/8” x 11/8”
Rack Card 6½” x 5” x1”
Product Ordering Information:
MTX = Module Transmitter–Signal Source
MRX = Module Receiver–Signal Receive
RTX = Rack Card Transmitter-Signal Source
RRX = Rack Card Receiver–Signal Receive
Example: MTX-81B-SL to RRX-81B-SL
11/2018 vv
4 CHANNEL BI-DIRECTIONAL
CONTACT CLOSURE SYSTEM
The American Fibertek 81B-SL Series multiplexes 8 total channels (4
contact in and 4 contact out) of dry latching contact closure on one
singlemode fiber. A user-selectable feature allows the contact status
to be maintained unchanged through power-cycle and loss-of-optical-
power. A reset button is available to clear all contact status to the
default state. A set of 8 LEDs on the transmitter and the receiver units
indicates the channel(s) status. These systems require no field
adjustments at installation or additional maintenance thereafter.
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 modules or rack cards that
are mounted in the American Fibertek Card Cages: SR-20/2 or SR-
20R/1.
MTX-81B
or
RTX-81B
MRX-81B
or
RRX-81B
ONE
SINGLEMODE
FIBER
CONTACT
OUTPUTS
Channels 1 to 4
CONTACT
INPUTS
Channels 5 to 8
CONTACT
INPUTS
Channels 1 to 4
CONTACT
OUTPUTS
Channels 5 to 8