Cisco Systems IPMUX-1E Timeslot Assignment in a Bundle, First Channel Second Channel

Chapter 1 Introduction IPmux-1/1EInstallation and Operation Manual

Note If the jumpers enable phantom feeding, the TE mode cannot be selected as the IPmux-1E operation mode. If phantom feeding is disabled, both NT and TE are valid options.

FXS/FXO/E&M

The section describes the FXS/FXO/E&M operation modes, which are:

•E1 mode

•T1-D4 mode

•T1 ESF mode.

The IPmux-1E FXS/FXO/E&M operation modes allow IPmux to work opposite E1, T1-D4, or T1-ESF. Two parameters are set internally when choosing one of the options:

•A-Law/∝-Law

A-Law when E1 mode is selected

∝-Law is used in PCM CODEC when T1 (D4 or ESF) is selected.

•E1, T1-D4, and T1-ESF with CAS are structured differently in the TDM ↔IP interworking function. A different structure must be used when working opposite each one.

Timeslot Assignment in a Bundle

A bundle is a group of timeslots associated with a specific E1 or T1 channel. IPmux-1/1E places individual or multiple TDM timeslots (up to 31 timeslots) into bundles with a single IP address destination.

ISDN BRI

The timeslot (TS) assignment in a bundle for IPmux-1E with ISDN BRI (when working opposite IPmux with E1/T1 or Megaplex) is assigned as follows:

First Channel

B1 B2 D

Second Channel

B1 B2 D

…

MSB Bits 7, 6 contain D channel information

MSB Bits 7, 6 contain D channel information

Figure 1-10. Timeslot Assignment in a Bundle, for IPmux-1E/ISDN

As shown in Figure 1-10,the four ISDN BRI channels consume 12 timeslots in the bundle. The E1/T1 IPmux should work in framed mode (no CAS).

The three TS groups in the bundle are assigned according to ISDN BRI channel numbers; the first group is assigned to the lowest ISDN BRI channel that is enabled, etc.

1-12 Functional Description