Specifications

Installation and Operation Manual Chapter 1 Introduction
IPmux-24 Ver. 1.5 Overview 1-5
HDLCoPSN
IPmux-24 also supports HDLCoPSN (HDLCoMPLS and HDLCoIP) transmission. This
makes IPmux-24 suitable for the following data transfer applications:
• Port-mode Frame Relay (FRAD)
• Transparent X.25 (PAD)
• Transparent PPP (router).
The HDLCoPSN is implemented in IPmux-24 according to the IETF RFC 4618
(excluding clause 5.3 – PPP) and RFC 5087. The HDLC uses bit stuffing to ensure
the bits stream continuity. The HDLC frames include the 16-bit FCS for the frame
validity check.
QoS
QoS supports:
• Labeling IP level priority (ToS/Diffserv) for PW packets
• VLAN tagging and priority labeling according to IEEE 802.1p&Q for PW packets
• Using EXP bits for QoS marking of the PW traffic in MPLS networks.
The user can configure the ToS (Type of Service) of the outgoing TDMoIP packets.
This allows an en-route Layer 3 router or switch, which supports ToS, to give
higher priority to IPmux-24 TDMoIP traffic for delay-sensitive and secure
applications. IPmux-24 allows you to configure the WHOLE ToS byte field, since
different vendors may use different bits to tag packets for traffic prioritization.
This also enables operation according to various RFC definitions (for example
RFC 2474, RFC 791). The user can also configure VLAN priority bits for Level 2
priority.
Ring Topology
The ring topology is used to protect the transmission path, when data
propagates over two alternative paths (“clockwise” or ”counterclockwise”). To
comply with the Ethernet protocol characteristics, an arbitrary pair of adjacent
nodes on the ring keep the ring open by disconnecting a ring segment, thereby
preventing frames from making a full round trip. If a segment breaks (fails), the
redundancy mechanism automatically moves the blocking nodes to the ends of
the failed segment and reconnects the previously disconnected segment.
Therefore, full connectivity is restored for any single point of failure. For
pseudowire traffic and other user-specified traffic, this change takes effect
within 50 msec.
A single ring may include up to 16 IPmux-24 devices and up to 16 VLAN plus an
additional VLAN for management traffic.
Management
IPmux-24 can be managed locally by connecting an ASCII terminal to the
RS-232 port on the rear panel, or via an HTTP connection (Web-based
management tool), Telnet or SNMP. The SNMP management capability enables
fully graphical, user-friendly management using the RADview Service Center