Specifications

Installation and Operation Manual Chapter 1 Introduction

IPmux-8/16 Ver. 6.00 Functional Description 1-11

Operation Modes

IPmux-8/16 operation modes for E1/T1 are:

• Unframed

• Fractional

• Fractional with CAS.

For IPMux-16 with E3/T3 TDM interfaces, unframed is the only operation mode.

Unframed

In the unframed mode, the incoming bit stream from each port (regardless of

framing) is converted into UDP/IP over Ethernet frames. This option provides clear

channel end-to-end service.

Framed

Fractional

In the fractional mode, the incoming bit stream is regarded as a sequence of

N × 64 kbps channel groups (according to framing). Each predefined group of

channels is converted into a structure block. The structure block is packetized into

UDP/IP frames and transmitted.

This mode allows transmission of several selected time slots and not the whole

E1/T1 as in transparent mode.

Fractional with CAS

In the fractional-with-CAS mode, the structure block (as described under

Fractional Operation Modes, above) also includes Channel Associated Signaling

(CAS).

Testing

Diagnostic capabilities include local and remote loopback tests for rapid location

of faults. Any of the ports can be looped locally toward the line, or toward the

remote end (see Chapter 6 for more information).

Timing Modes

The TDM Data Transmit (Tx) clock operates in several timing modes, to provide

maximum flexibility for connecting the IPmux-8/16 TDM interface.

The available timing modes are:

• Loopback clock – the TDM Tx clock is derived from the receive (Rx) clock.

• Adaptive clock – the TDM Tx clock is regenerated using the Adaptive method.

In this method, the fill level of the buffer receiving packets is monitored. If the

buffer begins to overfill, the regenerated Tx clock frequency increases to avoid

overflow. If the buffer begins to empty, the Tx clock (toward the TDM device)

decreases to avoid underflow.

In adaptive timing mode the regenerated clock is subject to network Packet Delay

Variation and may not comply with jitter and wander specifications.

Note