Specifications

Functional Description
RADring
Installation & Operation Manual
2-46 Power Consumption 3/11/98 12:33
EPR-4T/FL
The EPR-4T/FL module has four 10BaseT ports and one/two 10BaseFL ports.
It can only be connected to a RADring hub without an Ethernet bus. The
module functions in stand alone mode as an Independent Multiport
Repeater.
The EPR-4T/AUI can be connected to an additional RADring Ethernet
module in an Inter Repeater Link (IRL). Such a connection requires one
crossover cable.
The module performs an automatic partitioning and reconnection when a
port violates transmission protocols. LAN operation is not interrupted while
the module checks the affected port. Jabber lockup protection is used to
ensure that the LAN operation is not affected by the transmission of
excessively long packets. It also corrects reversed packet waveform polarity.
The EPR-4T/FL occupies two slots and has four screened RJ-45 connectors
and two/four ST connector. The UTP ports are connected by UTP and/or
screened UTP cables and the 10BaseFL ports are connected via 62.5/125µm
multimode fiber. Up to 10 modules can be installed in a single hub.
Extension
Modules
EP-1T/2W
The EP-1T/2W is a repeater with one 10BaseT and two WAN links. It can
only be connected to a RADring hub with an Ethernet bus. It is either
connected to the hub’s Ethernet bus as part of an Ethernet segment, or it
works as an independent repeater in stand alone mode.
The WAN links, which are based on RAD’s Ethernet extender/bridging chip
ChipBridge, support data rates of up to 10Mbps (sync) or up to 115.2 Kbps
(async). Various WAN link interfaces, such as: V.24, V.35, V.36, RS-530,
X.21, are supported.
Filtering and forwarding is performed at the maximum theoretical rate of
15,000 frames per second (wire speed). The buffer can hold 256 frames with
a throughput latency of one frame. Filtering can be disabled for extender or
segment applications, allowing all traffic to flow over the WAN link. The
bridge automatically learns MAC addresses of nodes that are members of the
LAN to which it is connected and forwards only those frames destined for
another LAN. Its LAN table stores up to 10,000 addresses and it is updated
automatically.
The EP-1T/2W occupies one slot, has one RJ-45 connector and one
customized Y cable, which is connected to a 50-pin SCSI connector on the
module. Up to 20 modules can be installed in a single hub allowing
connection of up to 40 WAN links.