Connections
Connect Fiber Optic Cable
The T1 cards are equipped with two optical connectors. Connect the fiber to the Transmit and Receive fiber
connectors. The transmit port is marked TX, and the receive port is marked RX. Verify that the TX fiber at one
card is connected to the RX port on the opposite end. The system will not operate if TX is connected to TX or RX
to RX.
Fiber cables should be routed loosely avoiding tight bends to prevent excessive optical loss.
Note:
The Single Channel T1 Fiber Link cards are compatible with the Single Channel T1 Fiber Link DIN
units. Refer to the DIN mount user guides for information related to the DIN mount modules.
Connect Copper T1 Send and Receive pairs
The T1 pairs from the Telco connect to the RJ-48C connector on the face of the card.
Note:
At the CO side, the Single Channel T1 modules are designed to operate on standard T1 lines that
are current limited at 60mA. Open circuit voltage on T1 lines can vary from 30V to 130V across
send and receive pairs depending on the number of repeaters in the line. However, voltage across
the module when operating will be 30VDC or less.
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RJ Connector Pinout Diagram
Powering the System
Powering at the CO end
Typically, the CO side module is span powered by a single 60mA simplex current sources derived from the T1
Telco Span Transmit and Receive copper pairs.
The CO side module may also be powered externally by connecting a 24-56VDC 60mA power source to the
power terminal on the unit. The 1 Channel T1 Cards are polarity insensitive to the DC input power source.
Powering at the SUB end
To local power, connect a 24-56VDC 60mA power source to the power terminal on the unit. The cards are
polarity insensitive to the DC input power source.
To span power the SUB side module you must have a minimum of one 60mA simplex current source on the T1
Send and Receive pairs on a working circuit.
Note
:
The CO and SUB units must be powered by separate isolated power sources to maintain high
voltage isolation.
T1 Surge Protection
Thermistors, and Sidactors limit transients appearing between the Tip and Ring of each pair. Transients
appearing at the power terminals or between input and output pairs are limited by PTC thermistors and a metal
oxide varistor.
RJ-48C Port
1
Receive (Ring)
5
Transmit (Tip)
2
Receive (Tip)
6
NC
3
NC
7
NC
4
Transmit (Ring)
8
NC
PIN 8
PIN 1
RLH Industries, Inc. • Tel. 866-DO-FIBER • Fax 714 532-1885 • www.fiberopticlink.com
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