Specifications

Installation and Operation Manual Chapter 2 Installation and Setup
FOM-E3, FOM-T3 Ver. 1.0 Installation and Setup 2-5
Table 2-3. Selecting the T3 Interface Cable
T3 Cable Length Jumper Positions (factory setting in bold)
JP1 JP2 JP3
0 ft – 225 ft Pins 2, 3 Pins 1, 2 Pins 2, 3
225 ft – 300 ft Pins 1, 2 Pins 1, 2 Pins 1, 2
More than 300 ft Pins 1, 2 Pins 2, 3 Pins 1, 2
Note: The maximum cable length complies with ITU-T G.703.
Closing the Case
After making the internal settings, close the FOM-E3 and FOM-T3 case.
 To close the FOM-E3 or FOM-T3 case:
1. Slide the PCB interior back into the case.
2. Screw in the two rear panel screws to fasten the main board in the case.
Connecting the Interfaces
Figure 2-4 shows a typical rear panel of a standard FOM-E3 unit and identifies
connector locations for the AC version.
ELECTRICAL OPTICAL
IN TXOUT RX
ALARMS
Figure 2-4. FOM-E3 Rear Panel
Connecting the E3/T3 Interface
The E3/T3 interface terminates in two BNC coax connectors, designated IN and
OUT.
 To connect E3/T3 interface:
1. Connect the receive line, using a 75Ω coaxial cable to the BNC connector
labeled IN.
2. Connect the transmit line, using a 75Ω coaxial cable to the BNC connector
labeled OUT.