Specifications

Chapter 1 Introduction Installation and Operation Manual
1-4 Overview MPW-1 MP-4100 Ver. 2.0
Features
MPW-1 is a pseudowire server I/O module that provides TDM pseudowire access
gateway services over packet-switched networks (Ethernet, IP, and MPLS) for
TDM traffic (E1, T1, SHDSL, ISDN, high-speed and low-speed data, voice) received
via the Megaplex-4100 TDM buses from other modules. The MPW-1 module has
eight independently-configurable internal DS1 ports, each capable of handling 32
timeslots, for a total processing capacity of 256 timeslots (the equivalent of 8 E1,
or 2.048 Mbps, streams). Multiple MPW-1 modules can be installed in the
Megaplex-4100 chassis, in accordance with the required pseudowire transport
capacity.
The MPW-1 module provides pseudowire emulation services over packet-switched
networks using the following user-configurable protocols:
• TDMoIP (TDM over IP) in accordance with RFC5087, and TDMoMPLS in
accordance with RFC5087 and ITU-T Rec. Y.1413
• HDLCoPSN (HDLC over PSN) in accordance with RFC5087 and RFC4618
(except Clause 5.3 – PPP)
• CESoPSN (structure-aware TDM circuit emulation over PSN) in accordance
with RFC5086
• SAToPSN (structure-agnostic TDM over PSN) in accordance with RFC4553
MPW-1 meets the requirements for edge-to-edge simulation of TDM circuits over
PSN in accordance with RFC4197, including high-performance adaptive timing
recovery capabilities. Pseudowires of all types, except HDLCoPSN, can be selected
as timing sources for the Megaplex-4100 nodal timing subsystem.
The number of pseudowires supported by each MPW-1 internal DS1 port depends
on the payload framing mode:
• Each framed internal DS1 port can be served by up to 16 pseudowires, where
each pseudowire can be separately routed to its desired destination over the
PSN, for a total of 128 destinations per module. The total number of
pseudowires is up to 640 per Megaplex-4100 chassis.
The actual number of active pseudowires depends on internal DS1 port
timeslot assignment (a timeslot can be included in a single pseudowire). An
internal cross-connect matrix, similar in capabilities to the cross-connect
matrices in other I/O modules, provides full control over timeslot routing from
any TDM port within the Megaplex-4100 to the desired pseudowire,
independently for each port, using either DS0 or DS1 cross-connect mode.
• An unframed E1 or T1 port is served by a single pseudowire (in this case, only
the DS1 cross-connect mode can be used).
Each pseudowire terminated on the MPW-1 can be independently configured to
handle the desired type of traffic:
• Transparent transfer of data (unframed E1 streams) using TDMoPSN, or
SAToPSN
• Transfer of framed E1 and T1 streams, using TDMoPSN and CESoPSN.
To support voice payload, the signaling information can also be transported.
Note that when using CESoPSN, any timeslots carrying signaling information
(either channel-associated signaling (CAS), or common-channel signaling