C2851-35UC-VSEC / K9

The Cisco C2851-35UC-VSEC/K9 is an enterprise-class integrated services router engineered for converged voice, data, and security in branch and mid-sized office networks. With dual Gigabit Ethernet LAN ports, extensive HWIC, AIM, NME, and PVDM expansion, it consolidates routing, IP telephony, and unified messaging onto a single Cisco platform. Built-in SNMP v3 management, IEEE 802.1p QoS, and IEEE 802.1Q VLAN support simplify operations for distributors, integrators, and end users across global deployments.

Product Features Comparison

Model	C2851-35UC-VSEC/K9, Cisco 2851 Integrated Services Router, PVDM2-48, NME-CUE, 35 CME/CUE/Ph lic	Juniper ACX5048-DC-L2-L3	ASR-903, Cisco ASR 903 Series Router, Chassis/High reliability/Modular design	CISCO3945-SEC/K9, Cisco 3900 Series Router, Security Bundle/SEC license
Brand	Cisco	Juniper	Cisco	Cisco
Routing Throughput	n/a	n/a	n/a	n/a
Interface Configuration	2 x RJ-45 10/100/1000Base-T LAN; 1 x RJ-45 Console; 1 x RJ-45 Auxiliary; 2 x USB; 13 expansion slots	48 SFP+/SFP ports; 6 QSFP ports	6 interface module slots; 2 power supply slots; 2 RSP slots	3 x 10/100/1000 RJ-45; 2 x SFP; 2 x USB; console/aux; multiple expansion slots
Supported Protocol	IEEE 802.1p QoS; IEEE 802.1Q VLAN; DES; 3DES; AES 128/192/256	QoS; Jumbo Frames up to 9216 bytes	n/a	Ethernet, Fast Ethernet, Gigabit Ethernet; OSPF; IS-IS; BGP; EIGRP; MPLS; IPv4/IPv6 routing
VPN Capability	DES, 3DES, AES 128/192/256 encryption	IP-VPN not included	n/a	VPN support; IPSec
Integrated Features	PVDM2-32 voice/fax DSP; NME-CUE; SNMP v3; Adv IP IOS	Layer 2 and Layer 3; redundant fans; redundant DC power	Fan tray with redundancy; modular PSU; high MTBF	Firewall protection; MPLS; QoS; Cisco IOS Security