Specifications

Chapter 2. Installation & Setup FOMi-E1/T1 Installation & Operation Manual
2-2 Jumper Setting
2.3 Equipment Needed
To operate the standalone version of the FOMi-E1/T1 modem on a desktop
or shelf, no additional equipment is needed.
To install the standalone version of the FOMi-E1/T1 modem in a 19" rack
(either single or in a side by side configuration when a couple is needed), a
rack adapter kit, RM-9, is required (for rack installation instructions refer to
Appendix A).
2.4 Jumper Setting
Warning
Access to the inside of the equipment is permitted only to authorized
and qualified service personnel.
To avoid accidental electric shock, always disconnect the interface
cables and the power cord before removing the unit from its casing.
Line voltages are present inside FOMi-E1/T1 when it is connected to
power and/or to the lines. Moreover, under external fault conditions
dangerous voltages may appear on the lines connected to the unit.
Any adjustment, maintenance, and repair of the opened instrument
under voltage should be avoided as much as possible and, when
inevitable, should be carried out only by a skilled technician who is
aware of the hazard involved. Capacitors inside the instrument may
remain charged even after the instrument has been disconnected from
its power supply source.
➤
➤ ➤
➤ To open the FOMi-E1/T1 case:
1. Disconnect the power cord from the mains outlet.
2. Release the two rear panel screws and use them as levers to slide the
PCB interior out of the unit.
➤
➤ ➤
➤ To set the jumpers:
1. Identify the jumper according to the configuration diagram
(see Figure 2-2).
2. Set the cable type jumper as required:
E1 unbalanced (75Ω)
E1 balanced (120Ω)
T1 balanced (100Ω)
(230 VAC and -48 VDC options are factory preset to E1 (120);
115 VAC is factory preset to T1.)