Cisco 1921 Specs The Cisco 1921 Router, which Memory and Flash Memory can't upgrade, is designed for branch offices.
Cisco 1921 Specs Model Services and Slot Density Embedded hardware-based cryptography acceleration (IPsec + SSL) RJ-45 onboard LAN/WAN 10/100/1000 ports EHWIC slots Doublewide EHWIC slots (use of a doublewide EHWIC slot will consume 2 EHWIC slots) Cisco Integrated Services Module (ISM) slots Memory (DDR2 DRAM): Default/maximum USB flash memory (internal): Default/maximum External USB flash-memory slots (Type A) USB console port (mini-Type B) (up to 115.2 kbps) Serial console port (up to 115.2 kbps) Serial auxiliary port (up to 115.2 kbps Integrated power supply Power-supply options Redundant-power-supply support Power Specifications AC input voltage AC input frequency AC input current range AC power supply (maximum) (amps) AC input surge current Typical power (no modules) Maximum power capacity with AC power supply Maximum power capacity with PoE power supply (platform only) Maximum PoE device power capacity with PoE power supply DC power input DC input wire size Safety ground-wire size Wire terminal (lug) Overcurrent protection Physical Specifications Dimensions (H x W x D)
Cisco 1921 Integrated Services Router Yes 2 2 1 0 512 MB/512 MB 256 MB/256 MB 1 1 1 1 AC and DC power-supply models POE (external) - on AC models only No 100-240V ~ 47-63 Hz 1.5-0.6 <50A 25W 60W 70W 80W 32-60 VDC, 4A, positive or negative, single source AWG 14 (2.0 mm2) AWG 14 (2.0 mm2), minimum Amp/Tyco No.32957 20A maximum 1.75 x 13.5 x 11.5 in. (4.45 x 34.29 x 29.21
Rack height Rack-mount 19 in. (48.3 cm) EIA Wall-mount (refer to installation guide for approved orientation) Weight: With AC power supply (no modules) Weight: With PoE power supply (no modules) Airflow
cm) 1 rack unit (1RU) Optional Yes 6.75 lb 7.5 lb Back to sides
The ports and slots on the back panel of Cisco 1921/K9
①
EHWIC slot
⑤
USB serial port
②
Auxiliary port
⑥
RJ-45 serial console port
③
GE 0/0（down）and 0/1(up)
⑦
USB port
④
Input power connector
⑧
POE
Source: http://www.cisco.com/c/en/us/products/collateral/routers/1900-series-integrated-services-routersisr/data_sheet_c78-598389.html From https://howcisco.wordpress.com