Cisco A903-RSP1B-55 is the Cisco ASR 903 Route Switch Processor. Cisco ASR 900 Series RSP modules contain separate control plane and data plane components. These include the main control plane CPU for the Cisco IOS Software operating system and platform control software. The data-plane packet processing and traffic management is performed by the Carrier Ethernet application-specific integrated circuit (ASIC).


Cisco ASR 900 Series Aggregation Services Routers

Full-featured, efficient aggregation platform

The ASR 900 Series is a modular aggregation platform that delivers cost-effective converged mobile, residential, and business services. You get redundancy, a shallow depth, low power consumption, and high service scale in routers packed with useful features and optimized for small aggregation and remote point-of-presence (POP) applications.

Features and benefits

  • Broadband aggregation
  • Pre-aggregation for mobile applications
  • Timing services
  • Suitable for harsh environments
SKU: CISCO A903-RSP1B-55 Category:


Sub Brands



Power consumption of chassis with 2 power supplies, 1 fan tray, and 1 RSP A903-RSP1B-55: 210W
RSP memory (DRAM) A903-RSP1B-55: 4 GB
Flash memory (storage) 2 GB
Service scale A903-RSP1B-55: Large
Ethernet interface module compatibility A900-IMA1X



TDM and ATM interface module compatibility A900-IMA16D



Maximum transmission unit (MTU) Configurable MTU of up to 9216 bytes, for bridging on Gigabit Ethernet, 10 and 100 Gigabit Ethernet
Maximum interface throughput 55 Gbps
IP version 4 performance 65 Mpps
IP version 6 performance 65 Mpps
Management ports Copper 10/100/1000Base-T LAN management port – RJ45 connector port Console/Aux RS232 serial ports – RJ45 connector port Console – USB 2.0 type A receptacle connector port
Timing ports BITS simultaneous input and output (J1/T1/E1) – RJ48 connector port

1 pps input – mini-coax connector port 1 pps output – mini-coax connector port 2.048/10 MHz input – mini-coax connector port 2.048/10 MHz output – mini-coax connector port

External USB flash memory Mass storage – USB 2.0 type A receptacle connector port
Shipment package size in inches (L x W x H) 14.38 x 14.38 x 6.25
Shipment package weight 6.2 lbs.
MTBF at 104ºF (40ºC) operating temperature 300,000 hours
Maximum Single-Dimensional Service Scale
MAC addresses 256,000
Bridge domains 4,000
Ethernet flow points 8,000
L3 interfaces 1,000
IPv4 routes 80,000
IPv6 routes 40,000
Multicast routes 8,000
MPLS VPN 1,000
MPLS labels 64,000
EoMPLS tunnels per system 8,000
VPLS instances 4,000
Queues 32,000
Classifications 24,000
Ingress policers 16,000
Class maps 4,000
Queue counters (packet and byte) 128,000
Policer counters (packet and byte) 96,000
IPv4 ACL entries
BFD sessions 511
IEEE 802.1ag (CFM) at 3.3ms interval 256


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