Specifications

Chapter 1 Introduction Installation and Operation Manual
1-4 Overview IPmux-24 Ver. 1.5
MPLS
IPmux-24 encapsulates PW payload with MPLS labels for transporting it over MPLS
networks (TDMoMPLS, CESoMPLS, SATOPoMPLS, HDLCoMPLS). Saving up to
20 bytes of overhead in comparison to the standard PWoIP encapsulation,
TDMoMPLS is ideal for bandwidth-sensitive networks.
IP
The data stream coming from the E1 or T1 port is converted into IP packets that
are transported over the Gigabit or Fast Ethernet ports, and vice versa. TDM
bytes are encapsulated in a UDP frame that runs over IP and over Ethernet. The
number of TDM bytes in an IP frame is configurable for throughput/delay
tradeoff. Each device has a two IP address (host IP and PW IP); the user can use
the same IP address for host and PW traffic. A configurable destination IP address
is assigned to the IP packets. IP ToS field support can be configured for IP Level
Priority.
Payload Encapsulation
Payload is encapsulated using the following methods:
• TDMoIP
• CESoPSN
• SAToP
• HDLCoPSN.
TDMoIP
TDMoIP (TDM over IP) payload encapsulation is implemented according to IETF
RFC 5087 and ITU-T Y.1413. It uses AAL1 format for constant rate/static
allocation of timeslots. The TDMoIP packet size is a multiple of 48 bytes. TDMoIP
encapsulation can be used with framed or unframed TDM service. It supports FDL
bit in T1 used for activating inband loopbacks.
CESoPSN
CESoPSN (Circuit Emulation Service over PSN) is a structure-aware format for
framed E1/T1 services. It converts structured E1/T1 data flows into IP or MPLS
packets and vice versa with static assignment of timeslots inside a bundle
according to ITU-T Y.1413 and IETF RFC 5086. The CESoPSN packet size is a
multiple of TDM frame size.
SAToP
SAToP (Structure Agnostic TDM over Packet) encapsulation method is used to
convert unframed E1/T1 data flows into IP or MPLS packets and vice versa
according to ITU-T Y.1413 and IETF RFC 4553. It provides flexible packet size
configuration and low end-to-end delay.