Cisco 1600 Series Router Architecture

Module − SIMM (72−pin, 60 ns, with or without parity). If SIMM is non−parity, total DRAM can be up to 18 MB. If SIMM is with parity, total DRAM can be up to 16 MB (on−board 2 MB will be disabled).

Note: The Cisco 1605−R Series Router has 8 MB on−board. Therefore, total DRAM can be up to 24 MB on that router. For more information, see Comparison of Cisco 1601, Cisco 1604, and Cisco 1605−R Memory Architectures.

To install or replace the DRAM, see Installing or Replacing the DRAM SIMM in Cisco 1600 Series Routers.

PCMCIA Flash is the only way to permanently store and move a complete Cisco IOS software image, backup configurations, or any other files.

PCMCIA Flash on the Cisco 1600 Series router is implemented using one slot for Fast PC cards (up to 16MB).

The PCMCIA Flash card on the Cisco 1600 Series router uses the Filesystem Class "B". This is the same type used for the Cisco 1000 Series Router and Cisco 3600 Series Router. For PCMCIA format compatibility information, see PCMCIA Filesystem Compatibility Matrix.

NVRAM is used for writeable permanent storage of the startup configuration. It is also used for permanent storage of hardware revision and identification information, as well as Media Access Control (MAC) addresses for LAN interfaces. It is a battery−backed Static RAM (SRAM). The lifespan of NVRAM is specified in the maximum number of writes and a maximum time limit. NVRAM size is 8 KB.

BOOT ROM is an Erasable programmable read−only memory (EPROM) used for permanently storing startup diagnostic code (ROM Monitor), and RxBoot. Boot ROM size is 2 MB. The Cisco 1600 Series Router runs RxBoot from Boot ROM.

For information on upgrading the Boot ROM, see Upgrading the Boot ROMs in Cisco 1600 Series Routers.

Registers are small, fast memory units used for storing special purpose information, such as interrupt status, currently executing instruction, and so on. The location of registers depends upon their use. For example, the main processor contains the instruction register and other control registers. UART contains its own status register such as other I/O devices and data read/write registers on various components. The main processor also contains general purpose registers for integer and floating point data used in an instruction execution.

The different types of memory can be seen in the output of the show version command:

Router−1600#show version

Cisco Internetwork Operating System Software

Compiled Thu 22−Feb−01 12:56 by kellythw

Image text−base: 0x08041D10, data−base: 0x02005000

ROM: System Bootstrap, Version 11.1(7)AX [kuong (7)AX], EARLY DEPLOYMENT RELEASE SOFTWARE (fc2)

ROM: 1600 Software (C1600−BOOT−R), Version 11.1(7)AX, EARLY DEPLOYMENT RELEASE SOFTWARE (fc2)

Router−1600 uptime is 2 hours, 49 minutes

System returned to ROM by reload

System image file is "flash:/c1600−sy−l.121−7.bin"

cisco 1603 (68360) processor (revision C) with 13824K/4608K bytes of memory. Processor board ID 05317740, with hardware revision 00000000

1600 specifications

Cisco Systems 1600 series routers are well-regarded in the networking industry for their reliability, versatility, and performance. Designed to meet the needs of small to medium-sized businesses, the Cisco 1600 series is primarily oriented towards providing robust connectivity for branch offices and remote sites.

One of the most significant features of the Cisco 1600 series is its modular architecture. This allows users to customize their routers with various interface cards, enabling support for different types of WAN technologies, including serial, ISDN, and Frame Relay. The modular design not only enhances flexibility but also extends the lifespan of the equipment, as businesses can upgrade their capacity and functionalities according to evolving demands.

Another key characteristic of the Cisco 1600 routers is their advanced routing capabilities. These devices support a wide range of routing protocols, including RIP, OSPF, EIGRP, and BGP. This versatility ensures seamless integration into existing network infrastructures, facilitating the scalability and adaptability that modern networks require.

Security is also a crucial aspect of the Cisco 1600 series. Incorporating features such as access control lists (ACLs) and support for Virtual Private Networks (VPNs), these routers help businesses safeguard their sensitive data during transmission. Enhanced security features allow companies to implement secure remote access for employees, thereby maintaining productivity without compromising safety.

In addition to routing and security, the Cisco 1600 series boasts Quality of Service (QoS) capabilities. This technology enables better management of network traffic, ensuring that critical applications receive the bandwidth they need for optimal performance. By prioritizing important data flows, businesses can enhance user experience and minimize disruptions across their network.

The Cisco 1600 series routers are also equipped with user-friendly interfaces and management tools. Cisco's IOS software platform provides a command-line interface (CLI) and web-based graphical interface for straightforward configuration and monitoring. This simplifies network management tasks and reduces the learning curve for IT personnel.

In summary, the Cisco Systems 1600 series routers offer a significant combination of modularity, robust routing protocols, enhanced security measures, Quality of Service features, and user-friendly management options. These characteristics make them an excellent choice for small to medium-sized enterprises looking to establish a reliable and secure networking infrastructure. With the continued evolution of networking technologies, the Cisco 1600 series stands as a dependable solution for businesses navigating an increasingly complex digital landscape.