Cisco 3825 - Manual (Page 24)

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Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03
Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router
New Features in Cisco IOS Release 12.4(16)MR1
• Emulation of TDM Circuit via MPLS/IP (PWE3/TDM), page 1-14
– Structure-agnostic TDM over Packet (SAToP), page 1-16
– Structure-aware TDM CESoPSN, page 1-16
• Transportation of ATM Service via MPLS/IP (PWE3/ATM), page 1-17
– Transparent Cell Transport Service/ATM Port Mode, page 1-17
– ATM N-to-One VCC Cell Mode, page 1-17
– ATM AAL5 CPCS-SDU Mode, page 1-18
– ATM One-to-One VCC Cell Mode, page 1-18
• Transportation of ATM Service via L2TPv3, page 1-20
– ATM Port Cell Relay Service, page 1-20
– ATM VCC Cell Relay Service, page 1-20
– ATM AAL5-SDU Mode, page 1-21
• Asymmetric PWE3, page 1-22
• Ethernet over MPLS, page 1-23
– VLAN Mode, page 1-23
– Port Mode, page 1-23
• PWE3 over MLPPP, page 1-24
• PWE3 Redundancy, page 1-24
– TDM PWE3 Redundancy, page 1-25
– ATM PWE3 Redundancy, page 1-25
– Ethernet PWE3 Redundancy, page 1-25
• Maximum Number of Supported ATM Ports, page 1-26
• ATM Cell Switching, page 1-26
Emulation of TDM Circuit via MPLS/IP (PWE3/TDM)
PWE3 is a mechanism that emulates the essential attributes of a T1/E1 line over a packet-switched
network (PSN). This evolutionary technology allows you to migrate all packet networks from legacy
TDM networks, yet provides transport for legacy applications. PWE3/TDM emulates T1/E1
unstructured and structured lines, including NxDS0 circuits over a Multiprotocol Label Switching
(MPLS) infrastructure.
Configuration for provisioning and creating the PW is done through the existing xconnect interface.
A new command cem-group has been added to this feature to create a circuit emulation (CEM) channel
from one or more time slots of T1/E1.
The group-number keyword identifies the group number used for this channel.
• For T1 controller, the range is 0-23. (24 cem-groups id)
• For E1 controller, the range is 0-30. (30 cem-groups id)
Use the unframed keyword to specify that a single CEM channel is being created, including all time slots
with no framing structure defined. If time slots are defined, the PWE3 circuit is circuit emulation service
over packet-switched network (CESoPSN).