The RFL 3000 4K24FR is dual-speed 10/100Mbps switch and has two fiber
connector port options. The switching capability allow the RFL 3000 4K24F to support
multiple workgroups smoothly, each with its own switched 100Mbps or 10Mbps domain.
The 4K24FR may be equipped with an optional internal -48VDC power supply
(See Appendix A). There is an additional option of a dual-source -48V input (See
Appendix B). The DC power feed options and the high quality and versatility make the
RFL 3000 4K24FR a good high-availability choice for telcos, ISPs, broadcast equipment,
medical, brokerage firm and financial facilities.
2.2.3
Up-link, port 1X for Cascading
The unit has an Up-link Port 1X, located on the left-front side of the hub. It enables the
first port’s RJ-45 cable to either connect to a user station ( port 1) or to be cascaded to
another hub (port 1X) with cross-over. (See Section 4.4 for more details about Up-link).
Like all 4K24C ports, Port # 1X is a dual-speed switched port which will sense the speed
of the connected device. Use port 1X on one 4K24 and port 1 (or any port) on the second,
i.e., use only one crossover port for a cascaded connection.
When the Up-link port is used to cascade two 4K24C together, the auto-sensing
feature will cause the connecting up-link to operate at 100Mb FDX speed.
2.2.4 Fiber-port options for 4K24F Model, 100Mb fiber
F
H
Figure 2.2.5 Fiber-Ports, FKM-1ST, FKM-1SC, FKM-1MTRJ
Two fiber ports are optional for RFL 3000 4K24F Switch. In a two-fiber port
module, all of the fiber ports are of the same speed, the same multi- or single-mode type,
and the same connector type. Multi-mode 100Mbps models are available with ST, SC,
and MT-RJ connectors. Single-mode 100Mbps models are available with SC connectors.
The 100Mb fiber port modules on the RFL 3000 4K24F normally are set (factory
default) to operate in full-duplex mode for best fiber distance and performance. On the
RFL 3000 4K24F, the user may select full- or half-duplex mode per-port with an internal
jumper setting (See Section 3.4) for the flexibility to adapt to any type of Fast Ethernet
devices.
On RFL 3000 fiber FKMs, there are two LED’s per fiber port mounted on the
front of the chassis. The Link (LK) LED indicates “ready for operation” when lit, and an
LED indicates Receiving Activity (ACT) on the port. A fiber cable must be connected to
