CHAPTER
Overview of the Router 1-1
1
Overview of the Router
Table 1-1 lists the router models discussed in this publication and provides a summary of
the interfaces supported on each model. These router models are similar in functionality,
but differ in the number of interfaces supported.
Table 1-1 Summary of Router Interfaces
Model
Ethernet
AUI
1
(DB-15)
1. AUI = attachment unit interface.
Token Ring
(DB-9)
Serial
(DB-60)
ISDN2 BRI3
(RJ-45)
2. ISDN = Integrated Services Digital Network.
3. BRI = Basic Rate Interface.
Cisco 2501/
CPA2501
1–2–
Cisco 2502/
CPA2502
–12–
Cisco 2503/
CPA2503
1–21
Cisco 2504/
CPA2504
–121
Cisco 2513/
CPA2513
112–
Cisco 2514/
CPA2514
2–2–
Cisco 2515
4
4. A CPA2515 model is not available.
–22–
1-2 Router Installation and Configuration Guide
Hardware Features
Note Throughout the remainder of the publication, one model number will be used in text
references. For example, references to the model 2501 router will apply to both the
Cisco 2501 and CPA2501 routers.
Hardware Features
In addition to the interfaces listed in Table 1-1, the routers include the following hardw are
features:
• Dynamic random-access memory (DRAM) for main memory and shared memory
• Nonvolatile random-access memory (NVRAM) for storing configuration information
• Flash memory for running the Cisco IOS software
• EIA/TIA-232 console port for local system access using a console terminal
• EIA/TIA-232 auxiliary port for remote system access using a 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).
Figure 1-1 to Figure 1-7 show the rear panels of the router models discussed in this
publication.
Overview of the Router 1-3
Hardware Features
Figure 1-1 Model 2501 Router Rear Panel
Figure 1-2 Model 2502 Router Rear Panel
H4262
Ethernet
AUI LED
Ethernet
AUI port
(DB-15)
Console
port (RJ-45)
Auxiliary port
(RJ-45)
On/off
switch
Power
Synchronous
serial LEDs
Synchronous
serial ports
(DB-60)
System
OK LED
H6585
Token Ring
port (DB-9)
Console
port (RJ-45)
Auxiliary port
(RJ-45)
On/off
switch
Power
Synchronous
serial ports
(DB-60)
Token Ring
LED
Synchronous
serial LEDs
System
OK LED
Loading...