Specifications

IPmux-4 Installation and Operation Manual Chapter 1 Introduction

Overview 1-3

T1 ports and framers comply with ANSI T1.403 standards. The T1 jitter

performance is according to G.824, TR-62411. The T1 framers support

pass-through, SF, ESF and CAS. The T1 port supports long haul and short haul

input signals and can be monitored for alarms and error statistics. FDL and transmit

PRM for T1/ESF are also supported.

E1 ports comply with G.703 and G.823 standards. E1 framers comply with G.704.

The E1 framers support pass-through, framed, CRC4 MF and CAS MF framing. The

E1 port supports long haul and short haul input signals and can be monitored for

alarms and error statistics.

The data stream coming from the E1 or T1 ports into IP frames is converted and

transferred over the Fast Ethernet port and vice versa.

The 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.

A single IP address should be set per device (Host IP). A destination IP address can

be configured for each bundle (see Multibundling, below). IP ToS field support can

be configured for IP Level Priority.

Ethernet

IPmux-4 has a half/full duplex, 10/100 Ethernet port for LAN connectivity.

The IPmux-4 Ethernet port supports auto-negotiation.

Half duplex operation in IPmux-4 is not recommended because collisions and

backoffs cause large delay variation and may exceed the delay variation buffer

tolerance at the receiving end, causing buffer underflows and errors to occur.

IPmux-4 supports VLAN tagging and priority.

Mode of Operation

IPmux-4 can operate in three different modes:

• Unframed full E1/T1 over UDP over IP over Ethernet

• Fractional E1/T1 over UDP over IP over Ethernet

• Fractional with CAS over UDP over IP over Ethernet.

Multibundling

A bundle is a group of timeslots originating from a specific E1 or T1 channel. Up to

31 bundles per E1 channel and 24 bundles per T1 channel can be defined for

transport over the network. Each bundle can contain 1 to 24/31 timeslots (T1/E1

respectively).

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