Cisco 2500 Series Overview

The Cisco 2500 series is a multiprotocol router platform that is the basis for the following four product types:

A compact single LAN multiprotocol router
A compact router/hub with 8, 14, or 16 Ethernet ports
A compact router/access server with 8 or 16 asynchronous serial ports
A dual LAN/multiprotocol router

This chapter provides an overview of the systems and their physical configuration, and contains the following information:

The 2500 series is available in four fixed-configuration network-interface options, which are listed in Table 1-1 and shown in Figure 1-2 through Figure 1-8.

Table 1-1: Network Interface Options

Model	Ethernet	Token Ring	Serial	BRI	Async	Hub	Product Type
2501	1	0	2	0	0	0	Multiprotocol router
2502	0	1	2	0	0	0
2503	1	0	2	1	0	0
2504	0	1	2	1	0	0
2505	0	0	2	0	0	8	Router/hub
2506	0	1	2	0	0	8
2507	0	0	2	0	0	16
2516	0	0	2	1	0	14
2508	0	1	2	0	0	16
2509	1	0	2	0	8	0	Router/access server
2510	0	1	2	0	8	0
2511	1	0	2	0	16	0
2512	0	1	2	0	16	0
2513	1	1	2	0	0	0	Dual LAN/ multiprotocol router
2514	2	0	2	0	0	0
2515	0	2	2	0	0	0

The multiprotocol router is a fixed-configuration system that is ready for external network hardware connections and software configuration. The router system code operates from Flash memory by default. (For more information on system-code operation, see the section "System Operation Prerequisites" in the chapter "Preparing for Installation.")

The network interface types include Ethernet 802.3 (AUI and RJ-45), Token Ring 802.5 (DB-9), synchronous serial, asynchronous serial, and Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI). The chassis can be rack- or wall-mounted, or it can be placed on a table or desktop. Figure 1-1 shows the front of the router.

Figure 1-1: Router Front View

The Cisco 2500 series hub is available with 8, 14, or 16 hub ports supporting Ethernet interfaces. A single BRI port is supported with 14 hub ports. The hub system code operates from Flash memory by default. For more information on system-code operation, see the section "System Operation Prerequisites" in the chapter "Preparing for Installation."

The Cisco 2500 series access server contains one or two asynchronous 68-pin SCSI-type connectors, depending on the access server model. Using a modular SCSI-type breakout cable (available from Cisco Systems), you can connect to 8 asynchronous serial devices. The modular SCSI-type breakout cable contains one 68-pin connector on one side of the cable and eight DB-25 connectors or RJ-45 connectors on the other side of the cable (depending on the type of cable you ordered). Therefore, if the Cisco access server contains one asynchronous 68-pin SCSI-type connector, using the modular SCSI-type breakout cable you can connect to eight asynchronous serial devices. If the Cisco access server contains two asynchronous 68-pin connectors, you can connect to 16 asynchronous serial devices.

The access server interface types include Ethernet 802.3 (AUI), Token Ring 802.5 (DB-9), asynchronous serial, and synchronous serial. The chassis can be rack or wall-mounted, or it can be placed on a table or desktop.

Note This publication takes you through the initial hardware installation and selected maintenance procedures. Refer to the Router Products Getting Started Guide or the router products configuration publication for software configuration and operating information. To order UniverCD, Cisco's library of product information in CD-ROM format, or printed documentation, refer to Ordering Cisco Documentation, which is in your warranty package.

An example of each router configuration is shown in Figure 1-2 through Figure 1-8.

Figure 1-2: Configurations for Models 2501 and 2503 Multiprotocol Routers

Figure 1-3: Configurations for Models 2501-DC and 2503-DC Multiprotocol Routers

Figure 1-4: Configurations for Models 2502 and 2504 Multiprotocol Routers

Figure 1-5: Configurations for Models 2513, 2514, and 2515 Dual LAN/Multiprotocol Routers

Figure 1-6: Configurations for Models 2505, 2507, and 2516 Routers/Hubs

Figure 1-7: Configurations for Models 2509 and 2511 Routers/Access Servers

Figure 1-8: Configurations for Models 2510 and 2512 Routers/Access Servers

System Specifications

Table 1-2 contains the specifications for this system.

Table 1-2: System Specifications

Description	Design Specification
Dimensions (H x W x D)	1.75" (one rack unit) x 17.5" x 10.56" (4.44 cm x 44.45 cm x 26.82 cm)
Weight	10 lb (4.5 kg)
Input voltage, AC power supply Current Frequency Power dissipation	100 to 240 VAC 0.5 to 1.0 A 50 to 60 Hz 40W (max.), 135.5 Btus/hr
Input voltage, DC power supply Current Power dissipation	40 W, 40 to 72 VDC, universal 0.5 to 1.0 A 40W (max.), 135.5 Btus/hr
Processor	20-MHz Motorola 68EC030
Router network interface options	1 Ethernet and 2 synchronous serial (2501) 1 Token Ring and 2 synchronous serial (2502) 1 Ethernet, 2 synchronous serial, and 1 BRI¹ (2503) 1 Token Ring, 2 synchronous serial, and 1 BRI (2504) 1 Ethernet, 1 Token Ring, 2 synchronous serial (2513) 2 Ethernet, 2 synchronous serial (2514) 2 Token Ring, 2 synchronous serial (2515)
Hub network interface options	2 synchronous serial, 8 hub, RJ-45 (2505) 2 synchronous serial, 16 hub, RJ-45 (2507) 2 synchronous serial, 1 BRI, 14 hub, RJ-45 (2516)
Access server network interface options	1 Ethernet, 2 synchronous serial, 8 asynchronous serial (2509) 1 Token Ring, 2 synchronous serial, 8 asynchronous serial (2510) 1 Ethernet, 2 synchronous serial, 16 asynchronous serial (2511) 1 Token Ring, 2 synchronous serial, 16 asynchronous serial (2512)
Ethernet interface	Ethernet AUI² IEEE³ 802.3
Token Ring interface	IEEE 802.5 (DB-9)
Synchronous serial interfaces	EIA/TIA-232⁴, EIA/TIA-449, V.35, X.21 (NRZ/NRZI⁵ and DTE/DCE⁶ mode) EIA-530 (NRZ/NRZI and DTE mode) All serial interfaces use the DB-60 connector at the chassis
Asynchronous serial interfaces	EIA/TIA-232, EIA/TIA-449, V.35, X.21 (NRZ/NRZIand DTE/DCEmode) EIA-530 (NRZ/NRZI and DTE mode) Asynchronous serial interfaces use the breakout cable (RJ-45)
BRI	ISDN⁷ Basic Rate S/T (RJ-45) (2503, 2504, and 2516 only)
Console and auxiliary ports	Asynchronous serial (RJ-45)
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)
Agency approvals	Safety: UL 1950, CSA 950, EN60950, TUV-GS-mark EMI: FCC Class A, VCE Class B, Canadian DOC Class A, EN55022 Class B (CISPR22 Class B), VCCI Class 2

¹ BRI=Basic Rate Interface.
² AUI=Attachment unit interface.
³ IEEE=Institute of Electrical and Electronic Engineers.
⁴ EIA/TIA=Electronic Industries Association/Telecommunications Industry Association. 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).
⁵ NRZ/NRZI=Nonreturn to zero/Nonreturn to zero inverted.
⁶ DTE/DCE=Data terminal equipment/Data communications equipment.
⁷ ISDN=Integrated Services Digital Network.

Memory Configurations

The systems contain the following types of memory:

Primary memory (main memory)--Dynamic random-access memory (DRAM) that stores the running configuration and routing tables.
Shared memory--Shared DRAM that is used for packet buffering by the router network interfaces.
System-code memory--Flash or programmable read-only memory (PROM); stores the operating system software image.
Boot ROM memory--Stores a subset of the operating system software image that is called the system bootstrap image or the bootstrap program (or ROM monitor). The system bootstrap image allows you to boot the router when Flash memory does not contain a valid system image.

: The boot ROM prompt follows: Router(boot)>. The bootstrap program (ROM monitor) prompt is the greater than sign (>), which differs from the user-level operating-system prompt of router>. (For more information, see the appendix "Virtual Configuration Register," and the appendix "Bootstrap Program."

Nonvolatile random-access memory (NVRAM)--Stores the system configuration file and the virtual configuration register.

Table 1-3 shows possible memory configurations for the router models.

Table 1-3: Memory Configurations

Memory Type	Memory Capacity
Primary memory (DRAM SIMMs)	1 MB (expandable to 4, 8, or 16 MB)
Shared (packet) memory	1 MB (DRAM on the board)¹
System-code memory (Flash or PROMs)	4 MB (expandable)
Boot ROM memory	2 MB (expandable)
Nonvolatile RAM (NVRAM) memory	32 KB

¹ The router has 2 MB of permanent (fixed) DRAM memory and a DRAM SIMM socket for upgrading the memory. 1 MB of this permanent memory is used by the CPU and is called primary memory. The other 1 MB of memory is used by the network interface ports to store packets and is called shared or packet memory. When a DRAM SIMM is installed in the DRAM SIMM socket, all of the DRAM memory on this SIMM becomes primary memory for the CPU, and the 2 MB of DRAM that is permanent on the board becomes shared memory.

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