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This chapter provides an overview of the Cisco Systems protocol translator product line. You will find the following information in this chapter:
Complex internetworks have grown past the point where they can depend on equipment from a single vendor. Virtually all organizations connecting local area networks (LANs) and creating wide area networks (WANs) today have major commitments to hardware and software from many different vendors. Therefore, current and future internetworking requires products that support multiprotocol, multimedia, and multivendor networks.
Cisco Systems protocol translators are high-performance application-level gateways that can provide connectivity among systems running differing protocols over a variety of communication media.
As part of their software capability, Cisco protocol translators provide distributed network management facilities to assist in performance monitoring, runtime error logging, and the Simple Network Management Protocol (SNMP). These features allow the network manager to examine and adjust the protocol translators for optimum performance.
Full network access control helps the network manager ensure effective system use. Remote configuration is also available through Telnet and MOP connections to virtual ports on the terminal servers.
Security features allow restrictions to resources on the network. The network manager can specify access lists to establish which users have access to which computers. A user-name-and-password-pair authentication scheme is also supported.
Cisco Systems protocol translators provide a flexible set of capabilities providing connection service using different media and between different hosts and resources running different protocols. The following descriptions summarize the protocols and connection services supported by the Cisco Systems protocol translators.
In addition to support of Ethernet (IEEE 802.3), Cisco protocol translators support synchronous serial circuits at many speeds. Cisco's protocol translator serial interfaces are capable of transmitting and receiving data at up to four megabits per second, and supports connectivity to WAN services such as SMDS, Frame Relay, and X.25.
For customer convenience, Cisco Systems markets a broad line of media adapters, including RS-232, V.35, X.21, and RS-449.
Part of the power and flexibility of Cisco Systems' product components is derived from their physical configuration options. Customers can choose from single-board systems, or card-based chassis configurations that offer processor, back panel connector mountings, and communications interfaces best suited to their network.
The following protocol translator models are available from Cisco Systems:
Cisco Systems uses either the MC68020 or MC68030 microprocessor for high-speed operation in their protocol translator products. All Cisco System microprocessors contain onboard RAM, system ROM holding all operating system, bootstrap, and diagnostic software, and hardware and software support for a control console.
Cisco Systems also offers optional nonvolatile memory that retains configuration information despite power losses or system reboots. With the nonvolatile memory option, the terminal and network servers need not rely on other network servers for configuration and boot service information.
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