Network Interconnections - Alcatel-Lucent 7750 Configuration Manual

Interface Configuration
Signaling (CAS) options. CAS configuration must be identical for all channel groups on a given
DS-1 or E-1.
Circuits encapsulated in MPLS will 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 CMA/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.
On the 7750 SR-c12 CES CMA, a BITS port is also provided. The BITS port can be configured as
one reference sources (ref1, ref2) in the system timing subsystem.

Network Interconnections

With the introduction of Alcatel-Lucent's 7750 SR, the SR-Series product family can fill the
needs of smaller service providers as well as the more remote point of presence (PoPs) locations
for larger service providers. To support the use of lower speed links as network links in the
likelihood that lower speed circuits are used as network or backbone links, the 7750 SR-Series
supports a DS-1/E-1/DS-3/E-3 port (ASAP MDAs) or channel and an MLPPP bundle (ASAP
MDAs) as network ports to transport and forwarding of all service types. This feature allows
service providers to use lower speed circuits to interconnect small PoPs and CoS that do not
require large amounts of network/backbone bandwidth.
7750 SR Interface Configuration Guide Page 31