CISCO1921/K9 |Network Hardware and ICT Service Professional Provider
Cisco 1921 Modular Router, 2 GE, 2 EHWIC slots, 512DRAM, IP Base
List Price:
Brand New Sealed

Product Overview

The Cisco 1921 builds on the best-in-class offering of the Cisco 1841 Integrated Services Routers. All Cisco 1900 Series Integrated Services Routers offer embedded hardware encryption acceleration, optional firewall, intrusion prevention, and advanced security services. In addition, the platforms support the industry's widest range of wired and wireless connectivity options such as Serial, T1/E1, xDSL, Gigabit Ethernet, and third-generation (3G) wireless (Figure 1).

Figure 1. Cisco 1921 Integrated Services Router

Key Business Benefits

Cisco ISR G2 routers provide superior services integration and agility. Designed for scalability, the modular architecture of these platforms enables you to grow and adapt with your business needs. Table 1 lists the business benefits of the Cisco 1900.

Table 1. Key Features and Benefits of the Cisco 1921 Integrated Services Router

Service integration•   The Cisco 1921 offers increased levels of services integration with data,   security, wireless, and mobility services, enabling greater efficiencies and   cost savings.
Services on demand•   A single Cisco IOS Software Universal image is installed on each ISR G2. The   Universal image contains all of the Cisco IOS Software technology sets that   can be activated with a software license, allowing your business to quickly   deploy advanced features without downloading a new Cisco IOS Software image.   Additionally, larger default memory is included to support the new   capabilities.

  High performance with integrated services
•   The Cisco 1900 Series enables deployment in high-speed WAN environments with   concurrent services enabled up to 15 Mbps.

  Network agility
•   Designed to address customer business requirements, the Cisco 1921 with the   modular architecture offers a performance range of modular interfaces and   services as your network needs grow.
• Modular interfaces offer increased bandwidth,   a diversity of connection options, and network resiliency.

  Energy efficiency
•   The Cisco 1921 architecture provides energy-savings features that include the   following:
• The Cisco 1900 Series offers intelligent   power management and allows you to control power to the modules based on the   time of day. Cisco EnergyWise technology will be supported in the future.
• Services integration and modularity on a   single platform performing multiple functions optimizes raw-materials   consumption and energy usage.
• Platform flexibility and ongoing development   of both hardware and software capabilities lead to a longer product   lifecycle, lowering all aspects of the TCO, including materials and energy   use.
• High-efficiency power supplies are provided   with each platform.
• DC Power option available (CISCO1921DC/K9).

  Investment protection
•   The Cisco 1921 maximizes investment protection:
• Reuse of a broad array of existing modules   supported on the original ISRs provides a lower TCO.
• A rich set of Cisco IOS Software features is   carried forward from the original ISRs and delivered in the Universal image.
• This router gives you the flexibility to grow   as your business needs evolve.

Architecture and Modularity

The Cisco 1921 is architected to meet the application demands of today's branch offices with design flexibility for future applications. The modular architecture is designed to support expanding customer requirements, increased bandwidth, and fully integrated power distribution to modules supporting 802.3af PoE and Cisco Enhanced PoE (ePoE). Table 2 lists the architectural features and benefits of the Cisco 1921.

Table 2. Architectural Features and Benefits

Architectural Feature


Modular platform

• The Cisco 1921 ISRs are highly modular platforms with multiple module slots to provide connectivity and services for varied branch-office network requirements.

• The ISRs offer an industry-leading breadth of LAN and WAN connectivity options through modules to accommodate field upgrades to future technologies without requiring replacement of the platform.


• The Cisco 1921 is powered by high-performance multicore processors that support growing demands of branch-office networks by supporting high-throughput WAN requirements.

Embedded IP Security/Secure Sockets Layer (IPsec/SSL) VPN hardware acceleration

• Embedded hardware encryption acceleration is enhanced to provide higher scalability, which, combined with an optional Cisco IOS Security license, enables WAN link security and VPN services (both IPsec and SSL acceleration).

• The onboard encryption hardware outperforms the advanced integration modules (AIMs) of previous generations.

Integrated Gigabit Ethernet ports

• All onboard LAN and WAN ports are 10/100/1000 Gigabit Ethernet routed ports.

Innovative universal-serial-bus (USB)-based console access

• A new, innovative, mini-Type B USB console port supports management connectivity when traditional serial ports are not available.

• The traditional console and auxiliary ports are also available. You can use either the USB-based console or the RJ-45-based console port to configure the router.

Optional external power supply for distribution of PoE

• An optional upgrade to the power supply provides inline power (802.3af-compliant PoE) and Cisco Standard Inline Power to optional integrated switch modules.

Modularity Features and Benefits

The Cisco 1921 provides significantly enhanced modular capabilities (refer to Table 3) that offer you investment protection. Most of the modules available on previous generations of Cisco routers, such as the Cisco 1841 ISR, are supported on the Cisco 1921. Additionally, you can easily interchange modules used on the Cisco 1921 with other Cisco routers to provide maximum investment protection. Taking advantage of common interface cards across a network greatly reduces the complexity of managing inventory requirements, implementing large network rollouts, and maintaining configurations across a variety of branch-office sizes.

A complete list of supported modules is available at

Table 3. Modularity Features and Benefits



Cisco Enhanced High-Speed WAN Interface Card (EHWIC)

• The EHWIC slot replaces the high-speed WAN interface card (HWIC) slot and can natively support HWICs, WAN interface cards (WICs), and voice/WAN interface cards (VWICs).

• Two integrated EHWIC slots are available on the Cisco 1921 for flexible configurations for support of two modules: One doublewide HWIC-D or two singlewide EHWIC/HWIC modules are supported.

• Each EHWIC slot offers high-data-throughput capability.

USB 2.0 ports

• One high-speed USB 2.0 port is supported. The USB port enables another mechanism for secure-token capabilities and storage.

 Product Specifications of Cisco 1941 Integrated Services Router

Cisco1941, Cisco1941W

Services and Slot Density

Embedded hardware-based crypto acceleration (IPSec)


Total Onboard Gigabit Ethernet 10/100/1000 WAN ports


RJ-45-Based Ports


SFP-Based Ports


SM Slots


Double-Wide SM Slots




Double-wide EHWIC slots 
(use of a double-wide EHWIC slot will consume two EHWIC slots)


ISM Slots

1 (0 on the Cisco 1941W)

Memory (DDR2 Error Correction Code [ECC] ECC DRAM) - Default

512 MB

Memory (DDR2 ECC DRAM) - Maximum

2.0 GB

Compact Flash (external) - Default

slot 0: 256 MB

slot 1: none

Compact Flash (external) - Maximum

slot 0: 4 GB

slot 1: 4 GB

External USB flash memory slots (Type A)


USB Console Port (Type B) (up to 115.2 kbps)


Serial Console Port (up to 115.2 kbps)


Serial Auxiliary Port (up to 115.2 kbps


Power Supply Options


Redundant Power Supply Support


Power Specifications

AC Input Voltage

100-240 V ~

AC Input Frequency

47-63 Hz

AC Input Current range AC Power Supply (Max) (Amps)


AC Input Surge Current

<50 A

Typical Power (No Modules)

35 W

Maximum Power capacity with AC power supply

110 W

Maximum Power capacity with PoE power supply (platform only)

110 W

Maximum PoE device power capacity with PoE power supply

80 W

Physical Specifications

Dimensions (H x W x D)

3.5 in x 13.5 in x 11.5 in

Rack Height

2 RU

Rack-mount 19in. (48.3 cm) EIA


Wall-mount (refer to installation guide for approved orientation)


Weight - with AC power supply (no modules)

12 lbs

Weight - with POE power supply (no modules)

12.8 lbs

Maximum Weight - Fully Configured

14 lbs


Front to Side

Environmental Specifications

Operating Condition

Temperature - 5906 feet (1800 m) max. altitude

0-40˚C (32-104˚F)

Temperature - 9843 feet (3000 m) max. altitude

0-25˚C (32-77˚F)


3000 m (10000 ft)


10 to 85% RH

Acoustic: Sound Pressure (Typ/Max)

26/46 dBA

Acoustic: Sound Power (Typ/Max)

36/55 dBA

Transporation/Storage Condition


-40-70˚C (-40-158˚F)


5 to 95%RH


4570m (15000 ft)

Regulatory Compliance


UL 60950-1

CAN/CSA C22.2 No. 60950-1

EN 60950-1

AS/NZS 60950-1

IEC 60950-1


47 CFR, Part 15

ICES-003 Class A

EN55022 Class A

CISPR22 Class A

AS/NZS 3548 Class A


CNS 13438

EN 300-386

EN 61000 (Immunity)

EN 55024, CISPR 24





ANSI T1.101

ITU-T G.823, G.824

IEEE 802.3

RTTE Directive

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