Specifications

3.2 Repeaters
3–2 Network Modules
Modules are provided in two sizes:
• Half-height modules are designed for use in either the DEChub 90, the
DEChub 900 MultiSwitch or the Digital MultiStack System.
• Full-height modules are designed for use in the DEChub 900 MultiSwitch.
Not all module sizes are provided for all applications and network types.
NOTE
Most half-height modules are packaged with a back cover and power supply
for standalone use.
Full-height modules require the DEChub ONE o r DEChub ONE-MX for
standalone operation. This provides the power necessary for a standalone
configuration. It must be ordered in addition to the module.
3.2 Repeaters
The DECrepeaters provide network connectivity to a variety of Ethernet devices
ranging from personal computers to mainframe systems. Repeater characteristics are
listed below. Not all functions are supported on all network modules.
• Support for several cable types including twisted-pair (both unshielded and
shielded), ThinWire coaxial cable, thick wire (attachment unit interface,
AUI) and fiber optic cable. This provides connection to devices that support
IEEE 802.3 (i.e., 10Base2, 10BaseT, 10BaseFL/FOIRL).
• Modules can be used standalone, stacked, and chassis-based for easy net-
work design and configuration.
• Full repeater functionality at the port level. Unlike products that perform
retiming/repeating remotely on a separate retiming module, they handle all
repeating functions on a per port basis.
• Identification of malfunctioning ports and automatically segments or
restores them to avoid network disruption.
• Provision of per-port statistics, such as total collision per module or number
of readable frames per port.
• Secure Ethernet capability that prevents data packets generated by unknown
or unauthorized end stations from accessing the network. Authorized station
addresses can be set under SNMP management control.