used cisco 2821 router:

Device Type	Router
Form Factor	External - modular - 2U
Width	43.8 cm
Depth	41.7 cm
Height	8.9 cm
Weight	11.4 kg
RAM	256 MB (installed) / 1 GB (max)
Flash Memory	64 MB (installed) / 256 MB (max)
Connectivity Technology	Wired
Data Link Protocol	Ethernet, Fast Ethernet, Gigabit Ethernet
Network / Transport Protocol	IPSec
Remote Management Protocol	SNMP 3
Status Indicators	Link activity, power
Features	Firewall protection, hardware encryption, VPN support, MPLS support, URL filtering
Compliant Standards	IEEE 802.3af
Expansion Slots Total (Free)	4 ( 4 ) x HWIC ¦ 2 ( 2 ) x AIM ¦ 1 ( 1 ) x NME-X ¦ 1 ( 1 ) x EVM ¦ PVDM ¦ 2 memory ¦ 1 CompactFlash Card
Interfaces	2 x network - Ethernet 10Base-T/100Base-TX/1000Base-T - RJ-45 ¦ 2 x USB ¦ 1 x management - console ¦ 1 x network - auxiliary
Encryption Algorithm	DES, Triple DES, AES
Compliant Standards	CISPR 22 Class A, CISPR 24, EN 61000-3-2, VCCI Class A ITE, IEC 60950, EN 61000-3-3, EN55024, EN55022 Class A, UL 60950, EN50082-1, CSA 22.2 No. 60950, AS/NZ 3548 Class A, JATE, FCC Part 15, ICES-003 Class A, CS-03, EN 61000-6-2
Power Device	Power supply - internal
Voltage Required	AC 120/230 V ( 50/60 Hz )
OS Provided	Cisco IOS
Min Operating Temperature	0 °C
Max Operating Temperature	40 °C
Humidity Range Operating	5 - 95%

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