Specifications

IPmux-4 Installation and Operation Manual Chapter 1 Introduction

Functional Description 1-7

Operation Modes

IPmux-4 operation modes are:

• Unframed

• Fractional

• Fractional with CAS.

Unframed

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

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

channel end-to-end service.

Fractional

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

nx64 Kbps channel groups (according to framing). Each predefined group of

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

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).

The relevant portion of the signaling channel is packetized and sent to the

destination.

Testing

Diagnostic capabilities include E1/T1 local and remote loopback tests for rapid

location of faults. Any of the E1/T1 ports can be looped locally toward the line, or

toward the remote end (see Chapter 4 for more information).

Timing Modes

The E1/T1 Transmit (Tx) clock can operate in several timing modes to provide

maximum flexibility for connecting the IPmux-4 E1/T1 interface. The clock of each

port (each port is autonomous) must be configured correctly on both the Receive

and Transmit ends to ensure proper operation and to prevent pattern slips.

Available timing modes are:

• Loopback – the E1 or T1 Transmit clock is derived from the E1/T1 Receive (Rx)

clock.

• Adaptive – in this mode, the E1 or T1 Tx (towards the TDM device) 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

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