1.4OVERVIEW
The HSIM-F6 extends the functionality of certain Cabletron Systems interface modules or standalone hubs to include high-speed uplink capability. The HSIM-F6 allows remote connectivity using FDDI technology.
1.4.1Features
Connectivity
The HSIM-F6 is equipped with slots for FDDI A and B ports. These two ports allow connection to the ring as a Dual Attached Station (DAS) using two FPIMs or as a Single Attached Station (SAS) using one FPIM.
As a DAS, the module or standalone hub that houses the HSIM-F6 connects directly to the FDDI primary ring. This provides the reliability of an FDDI dual, counter-rotating ring topology. If one segment of the FDDI ring becomes disabled, this dual ring configuration provides redundancy and restores ring continuity.
As a SAS, the HSIM-F6 connects to the primary ring only by using a single FPIM on the HSIM-F6 to attach to the M port of an FDDI concentrator.
The HSIM-F6 also supports dual homing. A dual homing configuration provides additional redundancy for the module or hub containing the HSIM-F6. Dual homing is a way of connecting to an FDDI ring through the Master (M type) ports of two separate dual attached concentrators. If one M type port or one segment fails, the redundant port or segment activates automatically to retain connection to the ring.
The HSIM-F6 is also capable of operating in full duplex mode, which creates a point-to-point link between two FDDI devices. This allows for a data rate of 200 Mbps, with each device transmitting and receiving at 100 Mbps simultaneously. Chapter 3, Local Management, provides instructions on configuring the HSIM-F6 to operate in full duplex mode.
Bridging
The HSIM-F6 provides translational bridging between any channels or ports in its host module or hub and the FDDI ring.