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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
1
Cisco ASR 901 Router Overview
Cisco ASR 901 Mobile Wireless Router is a cell-site access platform specifically designed to aggregate
and transport mixed-generation radio access network (RAN) traffic. The router is used at the cell site
edge as a part of a 2G, 3G, or 4G radio access network (RAN). The Cisco ASR 901 is availabe in the
following models:
• Cisco ASR 901-TDM version (A901-12C-FT-D, A901-4C-FT-D, A901-6CZ-FT-D,
A901-6CZ-FT-A)
• Cisco ASR 901-Ethernet version (A901-12C-F-D, A901-4C-F-D, A901-6CZ-F-D, A901-6CZ-F-A)
The Cisco ASR 901 router helps enable a variety of RAN solutions by extending IP connectivity to
devices using Global System for Mobile Communications (GSM), General Packet Radio Service
(GPRS), Node Bs using HSPA or LTE, Base Transceiver Stations (BTSs) using Enhanced Data Rates for
GSM Evolution (EDGE), Code Division Multiple Access (CDMA), CDMA-2000, EVDO, or WiMAX,
and other cell-site equipment.
The Cisco ASR 901 router transparently and efficiently transports cell-site voice, data, and signaling
traffic over IP using traditional T1/E1 circuits, including leased line, microwave, and satellite. It also
supports alternative backhaul networks, including Carrier Ethernet and Ethernet in the First Mile (EFM).
The Cisco ASR 901 router also supports standards-based Internet Engineering Task Force (IETF)
Internet protocols over the RAN transport network, including those standardized at the Third-Generation
Partnership Project (3GPP) for IP RAN transport.
Custom designed for the cell site, the Cisco ASR 901 features a small form factor, extended operating
temperature, and cell-site DC input voltages.
The Cisco ASR 901 TDM version provides 12 Gigabit Ethernet ports, 16 T1/E1 ports and one
Management port. Whereas, the Cisco ASR 901 Ethernet version does not contain the 16 T1/E1 ports.
It has only 12 Gigabit Ethernet ports and one management port.
The Cisco ASR 901 router supports Ethernet Virtual Circuits (EVC) only. Metro-Ethernet Forum (MEF)
defines an Ethernet Virtual Connection as an association between two or more user network interfaces
identifying a point-to-point or multipoint-to-multipoint path within the service provider network. An
EVC is a conceptual service pipe within the service provider network.
For more information on EVCs, see Configuring Ethernet Virtual Connections, page 8-1.