The Cisco 1921/K9 (CISCO1921/K9) is an Integrated Services Router (ISR) from Cisco's 1900 Series, specifically designed for small branch offices and small businesses. It's a compact, 1-rack-unit (1RU) device that offers a combination of data, security, and wireless services. It aims to provide high performance and a rich set of features in a small form factor, making it suitable for secure WAN connectivity, converged applications, and providing a reliable network infrastructure.

The 1921/K9 offers embedded hardware-based cryptography acceleration for enhanced security services like IPsec VPN. It is part of the Cisco ISR G2 (Generation 2) family, building upon the capabilities of previous generations with improved performance and modularity through Enhanced High-Speed WAN Interface Card (EHWIC) slots for flexible connectivity options.

It's important to note that the Cisco 1921/K9 has reached its End-of-Sale (September 29, 2018) and Last Date of Support (September 30, 2023), meaning it is no longer sold or officially supported by Cisco.

Cisco 1921/K9 Detailed Parameters

Parameter Category	Parameter	Specification
Chassis & Design	Model	CISCO1921/K9
	Form Factor	1RU (Rack-mountable, 19-inch optional)
	Integrated Components	Fixed configuration, all components integrated
	Airflow	Back to sides
Performance	Embedded Crypto Acceleration	Yes (IPsec + SSL)
Interfaces	Built-in Gigabit Ethernet Ports	2 x 10/100/1000Base-T (RJ-45)
	Expansion Slot(s)	2 x Enhanced High-Speed WAN Interface Card (EHWIC) slots
	Doublewide EHWIC slots	1 (consumes 2 EHWIC slots)
	Cisco Integrated Services Module (ISM) slots	0
	Management Ports	1 x Serial Console (RJ-45, up to 115.2 kbps), 1 x USB Console (mini-Type B, up to 115.2 kbps), 1 x Serial Auxiliary (RJ-45, up to 115.2 kbps)
	USB Ports	1 x External USB flash memory slot (Type A)
Memory	DRAM (Default/Maximum)	512 MB / 512 MB (DDR2 DRAM)
	Flash Memory (Internal Default/Maximum)	256 MB / 256 MB (USB Flash memory)
Power	Integrated Power Supply	AC and DC power-supply models
	Power Supply Options	PoE (external) - on AC models only
	Redundant Power Supply Support	No
	AC Input Voltage	100-240V ~
	AC Input Frequency	47-63 Hz
	Typical Power (no modules)	25W
	Maximum Power Capacity (AC Power Supply)	60W
	Maximum PoE Device Power Capacity (PoE PS)	80W
	DC Power Input	32-60 VDC, 4A (positive or negative, single source)
Software & Security	Operating System	Cisco IOS IP Base (default)
	Security Features	Embedded hardware-based cryptography acceleration (IPsec + SSL), Firewall protection, VPN support
Physical Specifications	Dimensions (H x W x D)	1.75 x 13.5 x 11.5 in. (4.45 x 34.29 x 29.21 cm)
	Weight (with AC power supply, no modules)	6.75 lb (3.06 kg)
	Rack-mount	Optional (19-inch EIA)
	Wall-mount	Yes (refer to installation guide for approved orientation)
Environmental	Operating Temperature (0-1800m altitude)	0°C to 40°C (32°F to 104°F)
	Operating Temperature (0-3000m altitude)	0°C to 25°C (32°F to 77°F)
	Operating Humidity	10% to 85% relative humidity (non-condensing)
	Operating Altitude	Up to 3,000m (10,000 ft)
	Storage Temperature	-40°C to 70°C (-40°F to 158°F)
	Storage Humidity	5% to 95% relative humidity (non-condensing)
	Acoustic Sound Pressure (typical/maximum)	32.99/58.33 dBA
Regulatory Compliance	Safety	UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
	EMC	47 CFR, Part 15 Class A, ICES-003 Class A, EN55022 Class A, CISPR22 Class A, AS/NZS 3548 Class A, VCCI V-3, EN 300-386, EN 61000 (Immunity), EN 55024, CISPR 24, EN50082-1
	Telecom	TIA/EIA/IS-968, CS-03, ANSI T1.101, IEEE 802.3, RTTE Directive
End-of-Life (EOL) Status	End-of-Sale Date	September 29, 2018
	Last Date of Support	September 30, 2023