Black Box LR5000A, Руководство пользователя

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4
RISC ROUTER EXPANDABLE
2.0 Introduction
This chapter describes the RISC Router Expandable inter-networking
platform, and contains information on the following:
• Major components
• Connectors (with pin assignments)
• Cables (with pin assignments)
• Hardware specifications
2.1 General Description
The RISC Router Expandable is a state-of-the-art RISC-based intelligent
bridge/router, employing the AMD
® 29000 microprocessor. The RISC Router
Expandable is a transparent network inter-connection device operating on
the MAC layer, level 2, of the OSI model. The RISC Router Expandable
currently routes TCP, IP, IPX™, and XNS protocols and bridges all others.
With eight Ethernet expansion slots, the RISC Router Expandable supplies
a variety of mixed-media hardware interfaces. The RISC Bridge/E Expansion
Card (LB521C) supports three interfaces:
• A Media-Access Unit (MAU) interface — a standard 15-pin male
connector. You can connect a workstation directly to this interface.
• A ThinNet (BNC) interface — a standard Thin Ethernet connection.
• A Data Terminal Equipment (DTE) interface — a standard 15-pin
female connector for a transceiver.
NOTE
IEEE 802.3 and Ethernet v.2 are identified as simply “Ethernet”
in this text.
The RISC Router Expandable delivers maximum bandwidth at 10 megabits per
second across eight individual LAN Ethernet ports. Peak filtering rates of up to
90,000 64-byte packets per second and forwarding at full Ethernet line speeds
of 56,000 64-byte packets per second are achieved under ideal conditions.
For wide area network connection, the RISC Router Expandable provides two
RS-449 serial links. The WAN interface supplies two high-speed transparent
serial channels operating at 384 Kbps. These channels provide a single logical
connection to a remote RISC Router Expandable while balancing the traffic
load over the two channels.