CHAPTER
1
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:
• System Specifications
• Memory Configurations
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
Token
Model Ethernet
2501 1 0 2 0 0 0
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
2507 0 0 2 0 0 16
2516 0 0 2 1 0 14
2509 1 0 2 0 8 0
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
2514 2 0 2 0 0 0
2515 0 2 2 0 0 0
Ring Serial BRI Async Hub Product Type
Multiprotocol router
Router/hub
Router/access server
Dual LAN/
multiprotocol router
Cisco 2500 Series Overview 1-1
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.
H1690
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.
1-2 Cisco 2500 Series Hardware Installation and Maintenance
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
H1686
DB-9 DB-60 RJ-45 On/off
switch
DB-15 DB-60 RJ-45 On/off
Power
Power
switch
Figure 1-3 Configurations for Models 2501-DC and 2503-DC Multiprotocol Routers
H1688
H2857
Cisco 2500 Series Overview 1-3
System Specifications
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"
Weight 10 lb (4.5 kg)
Input voltage, AC power supply
Current
Frequency
Power dissipation
Input voltage, DC power supply
Current
Power dissipation
Processor 20-MHz Motorola 68EC030
Router network interface
options
Hub network interface options 2 synchronous serial, 8 hub, RJ-45 (2505)
Access server network interface
options
Ethernet interface Ethernet AUI
Token Ring interface IEEE 802.5 (DB-9)
Synchronous serial interfaces EIA/TIA-232
Asynchronous serial interfaces EIA/TIA-232, EIA/TIA-449, V.35, X.21 (NRZ/NRZI
(4.44 cm x 44.45 cm x 26.82 cm)
100 to 240 VAC
0.5 to 1.0 A
50 to 60 Hz
40W (max.), 135.5 Btus/hr
40 W, 40 to 72 VDC, universal
0.5 to 1.0 A
40W (max.), 135.5 Btus/hr
1 Ethernet and 2 synchronous serial (2501)
1 Token Ring and 2 synchronous serial (2502)
1 Ethernet, 2 synchronous serial, and 1 BRI
1
(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)
2 synchronous serial, 16 hub, RJ-45 (2507)
2 synchronous serial, 1 BRI, 14 hub, RJ-45 (2516)
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)
2
IEEE3 802.3
4
, 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
and
DTE/DCE
mode)
EIA-530 (NRZ/NRZI and DTE mode)
Asynchronous serial interfaces use the breakout cable (RJ-45)
1-8 Cisco 2500 Series Hardware Installation and Maintenance
Memory Configurations
Description Design Specification
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.
Cisco 2500 Series Overview 1-9
Memory Configurations
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)
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
1
the memory. 1 MB of this permanent memory is used by the CPU and is called
other 1 MB of memory is used by the network interface ports to store packets and is called
primary memory. The
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.
1-10 Cisco 2500 Series Hardware Installation and Maintenance
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