Specifications

1-4
Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB
OL-21227-02
Chapter 1 Cisco MWR 2941 Router Overview
Features
a SONET/SDH circuit, or carried over a network using unstructured Circuit Emulation Service (CES).
Termination of specific carrier layers used between the PE and circuit emulation (CE) is performed by
an appropriate network service provider (NSP).
For instructions on how to configure SAToP, see the “Configuring Structure-Agnostic TDM over Packet
(SAToP)” section on page 4-79. For a sample SAToP configuration, see the “TDM over MPLS
Configuration” section on page A-14.
Structure-aware TDM Circuit Emulation Service over Packet-Switched Network
CESoPSN encapsulates structured (NxDS0) TDM signals as PWs over PSNs. It complements similar
work for structure-agnostic emulation of TDM bit-streams, such as PWE3-SAToP.
Emulation of NxDS0 circuits saves PSN bandwidth and supports DS0-level grooming and distributed
cross-connect applications. It also enhances resilience of CE devices due to the effects of loss of packets
in the PSN.
CESoPSN supports channel-associated signaling (CAS) for E1 and T1 interfaces. CAS provides
signaling information within each DS0 channel as opposed to using a separate signaling channel. CAS
also referred to as in-band signaling or robbed bit signaling.
For instructions on how to configure SAToP, see the “Configuring Circuit Emulation Service over
Packet-Switched Network (CESoPSN)” section on page 4-79. For a sample SAToP configuration, see
the “TDM over MPLS Configuration” section on page A-14.
Transportation of Service Using ATM over MPLS
An Asynchronous Transfer Mode (ATM) over MPLS PW is used to carry ATM cells over an MPLS
network. It is an evolutionary technology that allows you to migrate packet networks from legacy
networks, yet provides transport for legacy applications. ATM over MPLS is particularly useful for
transporting 3G voice traffic over MPLS networks.
You can configure ATM over MPLS in the following modes:
• N-to-1 Cell Mode—Maps one or more ATM virtual channel connections (VCCs) or virtual
permanent connection (VPCs) to a single pseudowire.
• 1-to-1 Cell Mode—Maps a single ATM VCC or VPC to a single pseudowire.
• Port Mode—Map one physical port to a single pseudowire connection.
The Cisco MWR 2941 also supports cell packing and PVC mapping for ATM over MPLS pseudowires.
For more information about how to configure ATM over MPLS, see the “Configuring Transportation of
Service Using ATM over MPLS” section on page 4-80. For sample ATM over MPLS configurations,
see the “ATM over MPLS Configuration” section on page A-17.
Transportation of Service Using Ethernet over MPLS
Ethernet over MPLS (EoMPLS) PWs provide a tunneling mechanism for Ethernet traffic through an
MPLS-enabled Layer 3 core network. EoMPLS PWs encapsulate Ethernet protocol data units (PDUs)
inside MPLS packets and use label switching to forward them across an MPLS network. EoMPLS PWs
are an evolutionary technology that allows you to migrate packet networks from legacy networks while
providing transport for legacy applications. EoMPLS PWs also simplify provisioning, since the provider
edge equipment only requires Layer 2 connectivity to the connected customer edge (CE) equipment. The
Cisco MWR 2941 implementation of EoMPLS PWs is compliant with the RFC 4447 and 4448
standards.