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مهمترین محصول این سری Cisco 2511 می باشد که در دو مدل RJ و Octal عرضه شده و به غیر از مسیریابی، قابلیت سرویس دهی به 16 خط آنالوگ از طریق مودم های اکسترنال را دارند.
دو سریال پورت ، دو ورودیASYNC جهت اتصال کابل های اکتال و همچنین یک پورت AUI جهت ارتباط با شبکه از مشخصه های اصلی این دستگاه می باشد، البته در مدل RJ کابل اکتال کابردی نداشته و 16 خروجی Rj45 جهت اتصال مودمها تعبیه شده است.
Cisco's newest Access Servers continue the Cisco tradition of pushing the performance envelope. The new Cisco 2509 through 2512 series Access Servers present the latest in remote node and asynchronous/synchronous routing. By extending the popular Cisco 2500 access router and adding asynchronous capabilities, these new servers revolutionize network connection by providing fast and easy access for all users.
2511--One Ethernet, two synchronous serial, 16 asynchronous high-speed lines.
Access Server Hardware Features
The access server has the following hardware features:
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8 or 16 ports for connection to modems, terminals, or other asynchronous (EIA/TIA-232) equipment
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2 MB to 16 MB (depending on the selected feature set) of primary memory, using dynamic random-access memory (DRAM) single in-line memory modules (SIMMs)
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32-KB nonvolatile random-access memory (NVRAM) to store configurations
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4-MB to 8-MB Flash memory for running the Cisco Internetwork Operating System (Cisco IOS) image
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2-MB shared packet memory
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Two synchronous serial ports for connection to a WAN
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EIA/TIA-232 console port for connection of a console terminal
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EIA/TIA-232 auxiliary port for connection of a terminal or modem
Note EIA/TIA-232 and EIA/TIA-449 were known as recommended standards RS-232 and RS-449 before their acceptance as standards by the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA).
The serial WAN connections use a proprietary, 60-pin connector. The Ethernet and Token Ring connections use standard LAN cabling with an attachment unit interface (AUI) or DB-9 connector.
The console terminal is used to provide basic and emergency local system access. The auxiliary port is used to provide basic and emergency remote system access.
The access server uses a 68-pin connector and breakout cable, which provides 8 RJ-45 ports on each cable. These ports use RJ-45-to-DB-25 adapters to connect to asynchronous devices.
Figure 1-1 Cisco 2500 Series Access Server (Model 2511 Shown)
Access Server Services
The access server connects terminals, printers, modems, microcomputers, and remote LANs over asynchronous serial lines to an internetwork. The access server uses a set of connection services to allow remote networks access to an internetwork of LANs and WANs.
The access server supports four types of server operation:
Remote Node Services
Remote node services support remote network connectivity with Serial Line Internet Protocol (SLIP), Point-to-point Protocol (PPP), AppleTalk Remote Access Protocol (ARA protocol), and XRemote.
Terminal Services
Terminal services provide terminal-to-host connectivity with virtual terminal protocols including Telnet, local-area transport (LAT), TN3270, and rlogin. Terminal services can be used to connect to a modem in a modem pool for outbound connectivity.
Asynchronous Routing Services
Routing services enable the access server to route packets over LANs and WANs using asynchronous interfaces to a remote LAN or WAN.
Protocol Translation Services
Protocol translation allows terminal services running over one protocol to be translated to terminal services running over another protocol such as an X.25 packet assembler/disassembler (PAD) to Telnet (using Transmission Control Protocol/Internet Protocol [TCP/IP]). Protocol translation on the access server supports Telnet, TN3270, LAT, X.25, and PAD.
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