Cisco CISCO1841-HSEC/K9 | 1800 Series 1841 2 x Ports 10/100Base-TX LAN + 3 x Expansion Slots 1U Rack-mountable Integrated Service Router

Here are 12 technical specifications for the Cisco 1841 64MB 256 RAM Integrated Service Router:

1. Processor: 1 x 333 MHz
2. RAM: 256 MB
3. Flash Memory: 64 MB
4. WAN Interface: 1 x 10Base-T/100Base-TX - RJ-45
5. LAN Interface: 2 x 10Base-T/100Base-TX - RJ-45
6. Expansion Slots: 2 x HWIC, 1 x AIM
7. Data Transfer Rate: 100 Mbps
8. Network / Transport Protocol: IPSec, PPPoE, PPPoA, DHCP, DNS, L2TPv3, PPTP, IPSec NAT Traversal
9. Routing Protocol: OSPF, RIP-1, RIP-2, BGP, EIGRP, HSRP, IGMPv2, IGMP, DVMRP, PIM-SM, static IP routing, GRE
10. Encryption Algorithm: DES, Triple DES, AES
11. Authentication Method: RADIUS, TACACS+
12. Power: AC 120/230 V (50/60 Hz)

Helpful notes:
1. The Cisco 1841 router is designed for small to medium-sized businesses that require secure and reliable internet connectivity.
2. It supports multiple protocols and routing protocols, making it a versatile option for network administrators.
3. The router's encryption algorithms and authentication methods provide added security for sensitive data.