RAD Data comm IPmux-16 operation manual Operation Modes, Testing, Timing Modes

IPmux-16Installation and Operation Manual Chapter 1 Introduction

Bundles composed of several timeslots (E1: 1-31, T1: 1-24) can be defined. Each bundle can be connected to a different destination bundle anywhere on the network.

Up to 496 sub-E1 or 384 sub-T1 remote bundles can be attached to one central IPmux-16. Multibundling enables concentrating many remote sites with few timeslots to the same TDM channel at the central site. A mesh topology application, in which the bundles at each site are defined to connect to several sites, is also supported.

Operation Modes

IPmux-16 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).

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-16 E1/T1 interface.

The available timing modes are:

•Loopback: The E1 or T1 Transmit clock is derived from the E1/T1 Receive clock.

Functional Description 1-7