RFL Electronics RFL 9660, Инструкция по эксплуатации, Страница: 134 / 312

RFL 9660 RFL Electronics Inc.
April 24, 2007 9-1 (973) 334-3100
Section 9. FIBER OPTIC SET-UP INFORMATION
9.1 INTRODUCTION
The RFL
9660 Digital Switch can be equipped with an optional fiber optic master I/O module
(Part Number 104430). This provides the RFL 9660 with a time-division multiplex (TDM) fiber optic ring. Up to
32 asynchronous serial data channels can be multiplexed onto the fiber optic ring. The ring is periodically polled
by sending a specially coded message that checks the ring's integrity.
The fiber optic master I/O module is installed in one of the horizontal I/O slots at the rear of the RFL 9660. When
installing a fiber optic I/O module, the following rules apply:
1.
The bottom I/O module slot must always be occupied.
2.
Additional device I/O modules must be installed from bottom to top; do not skip any I/O module slots.
3. An RFL 9660 may contain both RS-232 and fiber optic device I/O modules. If both types are to be
installed, the RS-232 I/O modules must be at the bottom, with the fiber optic module on the top.
4. If you are adding an RS-232 I/O module to an RFL 9660 that already has a fiber optic I/O module, the
fiber optic I/O module must be moved up one slot and the RS-232 I/O module installed below it. If the
RFL 9660 has already been programmed for the devices connected to the fiber optic loop, it will have
to be re-programmed, since the fiber optic devices have now been moved up eight port numbers. The
address of the fiber optic remotes must be changed to reflect programming.
Each device being interfaced to the fiber optic ring must be equipped with a fiber optic remote module
(Part Number 104460). Each fiber optic remote module is mounted in a compact housing that can be fastened
near or on the device being connected to it. A 9-pin D-subminiature connector (DE-9) is provided for
connections between the fiber optic remote module and the device. A terminal strip accepts the available dc
input voltage (9, 48, or 125 Vdc).
Connections between the fiber optic master I/O and the fiber optic remote modules are made using 850-nm
multimode fiber with ST connectors. Loop lengths up to 2000 feet (610 meters) can be accommodated by the
RFL 9660's optical power budget of 8 dB (6.5 dB worst-case). Switch-controlled attenuators on both the master
I/O and the fiber optic remote modules vary the optical power from -16 dBm to -10 dBm. Each fiber optic port is
configured by using the same super-user port configuration commands as RS-232 ports. (See Sections 3 and 5
for more information.)
9.2 FIBER OPTIC MASTER I/O MODULE
The fiber optic master I/O module has one two-position programmable DIP switch labeled "S1," two LED
indicators labeled "DATA" and "ACTIVE," and two fiber optic connectors labeled "TX and "RX." Figure 9-1
shows the location of these items.