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The Cisco 2520/CPA2520, Cisco 2521/CPA2521, Cisco 2522/CPA2522, and Cisco 2523/CPA2523 routers are full-featured multiport serial routers with synchronous serial, LAN, and asynchronous/synchronous serial ports permitting use as a router or communications server.
The multiport serial routers are available in the following configurations:
| Cisco 2520/CPA2520 | 1 Ethernet port with a selectable attachment unit interface (AUI) connection or 1 Ethernet 10BaseT connection
1 Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) port (RJ-45) 2 high-speed synchronous serial ports 2 low-speed asynchronous/synchronous serial ports |
| Cisco 2521/CPA2521 | 1 Token Ring shielded twisted pair (STP) port or 1 Token Ring unshielded twisted-pair (UTP) port
1 ISDN BRI port (RJ-45) 2 high-speed synchronous serial ports 2 low-speed asynchronous/synchronous serial ports |
| Cisco 2522/CPA2522 | 1 Ethernet port with a selectable AUI connection or 1 Ethernet 10BaseT connection
1 ISDN BRI port (RJ-45) 2 high-speed synchronous serial ports 8 low-speed asynchronous/synchronous serial ports |
| Cisco 2523/CPA2523 | 1 Token Ring STP port or 1 Token Ring UTP port
1 ISDN BRI port (RJ-45) 2 high-speed synchronous serial ports 8 low-speed asynchronous/synchronous serial ports |
Figure 1-1, Figure 1-2, Figure 1-3, and Figure 1-4 shows the rear panels of the Cisco 2520/CPA2520, Cisco 2521/CPA2521, Cisco 2522/CPA2522, and Cisco 2523/CPA2523 routers, respectively.
The multiport serial routers function not only as multiprotocol routers but also as communication servers (see Figure 1-1) for telecommuting services. The multiport serial routers offer high-speed synchronous serial lines for T1 connections, and low-speed asynchronous/synchronous serial lines to attach terminal equipment such as a channel service unit/data service unit (CSU/DSU).
Figure 1-1 through Figure 1-4 show the rear panels of the multiport serial routers.
Figure 1-1 : Cisco 2520/CPA2520 Multiport Serial Router---Rear Panel
Figure 1-2 : Cisco 2521/CPA2521 Multiport Serial Router---Rear Panel
Figure 1-3 : Cisco 2522/CPA2522 Multiport Serial Router---Rear Panel
Figure 1-4 : Cisco 2523/CPA2523 Multiport Serial Router---Rear Panel
The asynchronous/synchronous ports are configured as either asynchronous or synchronous. The default is a synchronous port configuration.
Asynchronous/Synchronous Port Features
The low-speed asynchronous/synchronous ports connect terminals, printers, modems, microcomputers, and remote LANs over asynchronous serial lines to an internetwork, or to synchronous devices such as DSU/CSUs on the same ports. The asynchronous/ synchronous ports support data transmission rates of up to 115.2 kbps on the following serial interfaces:
The multiport serial routers support numerous protocols. The following are examples of some of the low-speed synchronous and asynchronous protocols:
Communications Server Services
The multiport router acts as a communications server to connect terminals, printers, modems, microcomputers, and remote LANs over asynchronous serial lines to an internetwork. The communications server uses a set of connection services to allow remote networks access to an internetwork of LANs and WANs.
The router supports four types of server operation:
Remote node services support remote network connectivity with Serial Line Internet Protocol (SLIP), Point-to-Point Protocol (PPP), or AppleTalk Remote Access Protocol (ARA protocol).
Single users with laptop or desktop computing devices can access corporate data and many other resources on the Internet using dialup lines. Figure 1-5 shows an example network.
Figure 1-5 : Remote Node Services---Example Network
Terminal services provide terminal-to-host connectivity with virtual terminal protocols including Telnet, rlogin, local-area transport (LAT), TN3270, and X.25 packet assembler/disassembler (PAD). Terminal services can be used to connect to a modem in a modem pool for outbound connectivity. Figure 1-6 shows an example network.
Figure 1-6 : Terminal Services---Example Network
Routing services enable the multiport router to route packets over LANs and WANs using the asynchronous interfaces. A key benefit of asynchronous routing is that it provides low-cost operation by using dialup telephone networks only when needed. Figure 1-7 shows an example network.
Figure 1-7 : Asynchronous Routing---Example Network
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 PAD to Telnet (using Transmission Control Protocol/Internet Protocol [TCP/IP]). Protocol translation on the multiport router supports Telnet, TN3270, LAT, and X.25 PAD. Figure 1-8 shows an example network.
Figure 1-8 : Protocol Translation Services---Example Network
The system specifications of the Cisco 2500 series multiport routers are listed in Table 1-1.
Table 1-1 : System Specifications
| Description | Specification |
|---|---|
| Dimensions (H x W x D) | 1.75 x 17.5 x 10.56 inches (one rack unit) (4.44 x 44.45 x 26.82 cm) |
| Weight | 10 lb (4.5 kg) |
| Input voltage, AC power supply
Current Frequency Power dissipation |
100 to 240 VAC
0.6 to 1.2A 50 to 60 Hz 40W (maximum), 135.5 Btus1/hr |
| Input voltage, DC power supply
Current Power dissipation |
-- 40 to --72 VDC
1.5 to 1.0A 40W (maximum), 135.5 Btus/hr |
| Processor | 20-MHz Motorola 68EC030 |
| Network interface options | model 2520:
|
| Operating environment | 32 to 104°F (0 to 40°C) |
| Nonoperating temperature | --40 to 185°F (--40 to 85°C) |
| Operating humidity | 5 to 95%, noncondensing |
| Noise level | 34 dBa @ 3' (0.914 m) |
| Regulatory Compliance | FCC Class A. For more regulatory information, refer to the Regulatory Compliance and Safety Information document that accompanied you router. |
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