Cisco 1601R, 1601, 1602, 1603, 1604 User Manual
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Table of Contents
Cisco 1600 Series Router Architecture.............................................................................................................1
Document ID: 5406..................................................................................................................................1
Introduction..........................................................................................................................................................1
Prerequisites.........................................................................................................................................................1
Requirements..........................................................................................................................................1
Components Used...................................................................................................................................1
Conventions............................................................................................................................................2
Hardware Overview.............................................................................................................................................2
Cisco 1601..............................................................................................................................................2
Cisco 1602..............................................................................................................................................2
Cisco 1603..............................................................................................................................................2
Cisco 1604..............................................................................................................................................2
Cisco 1605..............................................................................................................................................3
Block Diagram........................................................................................................................................3
Memory Details...................................................................................................................................................4
DRAM....................................................................................................................................................4
PCMCIA Flash.......................................................................................................................................5
NVRAM..................................................................................................................................................5
BOOT ROM...........................................................................................................................................5
Registers..................................................................................................................................................5
Sample Output........................................................................................................................................5
Boot Sequence.....................................................................................................................................................6
Packet Switching.....................................................................................................................................8
Switching Paths..................................................................................................................................................10
1 − Receive the packet..........................................................................................................................10
2 − Switch the Packet............................................................................................................................10
3 − Transmit the Packet........................................................................................................................11
NetPro Discussion Forums − Featured Conversations......................................................................................11
Related Information...........................................................................................................................................12
Cisco − Cisco 1600 Series Router Architecture
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Cisco 1600 Series Router Architecture
Document ID: 5406
Introduction
Prerequisites
Requirements
Components Used
Conventions
Hardware Overview
Cisco 1601
Cisco 1602
Cisco 1603
Cisco 1604
Cisco 1605
Block Diagram
Memory Details
DRAM
PCMCIA Flash
NVRAM
BOOT ROM
Registers
Sample Output
Boot Sequence
Packet Switching
Switching Paths
1 − Receive the packet
2 − Switch the Packet
3 − Transmit the Packet
NetPro Discussion Forums − Featured Conversations
Related Information
Introduction
This document provides an overview of the hardware and software architecture of the Cisco 1600 Series
Routers.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on the Cisco 1600 Series Routers.
The information in this document was created from the devices in a specific lab environment. All of the
devices used in this document started with a cleared (default) configuration. If your network is live, make sure
Cisco − Cisco 1600 Series Router Architecture
that you understand the potential impact of any command.
Conventions
For more information on document conventions, refer to the Cisco Technical Tips Conventions.
Hardware Overview
Cisco 1600 Series Routers are composed of these router models:
Cisco 1601 and 1601REthernet/Serial Modular Router•
Cisco 1602 and 1602REthernet/Serial Modular Router with 56K CSU/DSU (4−wire)
Cisco 1603 and 1603REthernet/ISDN−BRI (S/T interface) Modular Router
•
Cisco 1604 and 1604REthernet/ISDN−BRI Modular Router with NT1 (U interface)•
Cisco 1605RDual Ethernet Modular Router•
In addition, all the 1600 router models have one WAN interface card (WIC) slot where you can insert one of
the WAN Interface Cards for the Cisco 1600 Series Routers.
Cisco 1601
Figure 1 Cisco 1601 and 1601R Rear Panel
Cisco 1602
Figure 2 Cisco 1602 and 1602R Rear Panel
Cisco 1603
Figure 3 Cisco 1603 and 1603R Rear Panel
Cisco 1604
Figure 4 Cisco 1604 and 1604R Rear Panel
Cisco − Cisco 1600 Series Router Architecture
Cisco 1605
Figure 5 Cisco 1605R Rear Panel
Block Diagram
Figure 6 represents the basic block diagram of the 1600 router.
Figure 6 Basic Block Diagram of the 1600 Router
The basic characteristics and functions of each block in this platform can be summarized as:
ProcessorThe processor used in the 160x Series is the Motorola 68360 Complex Instruction Set
Computer (CISC). The main job of the processor is to load instructions defined in Cisco IOS®
software from PCMCIA Flash or from RAM (for the R models) and execute them, which basically
involves some manipulation of data. The M68360 is an embedded controller, and has a 32−bit
address, a 32−bit data bus, a 33 MHz internal clock, and a built−in Serial Communication Channels
(SCC).
•
MemoryThis is discussed in more detail in the Memory Details section.•
BusesBuses are used by the CPU to access various components of the system and transfer
instructions and data to or from specified memory addresses.
CPU Bus is for high speed operations, with direct processor access. It has a 32−bit address
and 32−bit data at 33 MHz. These include access to dynamic RAM (DRAM), Boot ROM,
Non−Volatile RAM (NVRAM), PCMCIA Flash, and WIC.
♦
Input/Output (I/O) Bus allows the M68360 to individually control other devices through the
SCCs. This includes Universal Asynchronous Receiver/Transmitter (UART), the Ethernet
controller, and the WAN port interface.
♦
•
Cisco − Cisco 1600 Series Router Architecture
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