The channelized OC-3/STM-1/OC-12/STM-4 CES MDAs (m1-choc3-ces-sfp, m4-choc3-ces-sfp, m1-choc12-ces-sfp) provide an industry leading consolidation for DS-1, E-1 and n*64 kb/s for CES.
The channelized OC-3/STM-1/OC-12/STM-4 CES MDAs support CES. Circuit emulation services are interoperable with the existing 7705 SAR and 7250 SAS circuit emulation services. They are also interoperable with the 1850 TSS-5 circuit emulation services.
Two modes of circuit emulation are supported: unstructured and structured. Unstructured mode is supported for DS-1 and E-1 channels as per RFC4553 (SAToP). Structured mode is supported for n*64 kb/s circuits as per RFC 5086, Structure-Aware Time Division Multiplexed (TDM) Circuit Emulation Service over Packet Switched Network (CESoPSN). In addition, DS-1, E-1 and n*64 kb/s circuits are also supported as per MEF8, Circuit Emulation Services over Ethernet (CESoETH) (Oct 2004). TDM circuits are optionally encapsulated in MPLS or Ethernet as per the applicable standards.
All channels on the CES MDA are supported as circuits to be emulated across the packet network. This includes DS-1, E-1 and n*64 kb/s channels. Structure agnostic mode is supported for DS-1 and E-1 channels. Structure aware mode is supported for n*64 kb/s channel groups in DS-1 and E-1 carriers. N*64 kb/s circuit emulation supports basic and Channel Associated Signaling (CAS) options. CAS configuration must be identical for all channel groups on a DS-1 or E-1.
Circuits encapsulated in MPLS, use circuit pipes (Cpipes) to connect to the far end circuit. Cpipes support either SAP-spoke SDP or SAP-SAP connections.
Circuits encapsulated in Ethernet can be selected as a SAP in Epipes. Circuits encapsulated in Ethernet can be either SAP-spoke SDP or SAP-SAP connections for all valid Epipe SAPs. An EC-ID and far-end destination MAC address must be configured for each circuit.
Each OC-3/STM-1 port can be independently configured to be loop-timed or node-timed. Each OC-3/STM-1 port can be configured to be a timing source for the node. Each DS-1 or E-1 channel can be independently configured to be loop-timed, node-timed, adaptive-timed, or differential-timed. One adaptive timed circuit is supported per MDA. The CES circuit configured for adaptive timing can be configured to be a timing source for the node. This is required to distribute network timing to network elements which only have packet connectivity to network.