IPmux-1/1E Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-11
E1/T1
This section describes the IPmux-1 E1/T1 operation modes, which are:
• Unframed – valid for static and CESoIP/E1
• Fractional – valid only for static and CESoIP
• Fractional with CAS –valid only for static and dynamic CAS .
Unframed (Transparent)
In the transparent mode, the incoming bit stream from each channel (regardless of
framing) is converted into IP over Ethernet frames. This option provides clear
channel end-to-end service (unframed).
Fractional
In the fractional mode, the incoming bit stream is regarded as a sequence of
n x 64 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 timeslots without the whole E1
or T1 frame, as in transparent mode.
Use Fractional mode when grooming ISDN BRI channels from a remote IPmux-1E
unit.
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.
Use Fractional with CAS mode when grooming FXS/FXO/E&M channels from a
remote IPmux-1E unit.
ISDN BRI
The section describes the IPmux-1E ISDN BRI S-interface operation modes, which
are:
• TE mode
• NT mode.
The selected mode applies to all 4 channels. The NT or TE mode is determined by
phantom feeding and software setting, which is enabled/disabled by jumpers
located on the ISDN BRI card (see Chapter 2).
TE Mode
All four channels are configured in TE (Terminal Equipment) as defined in I.430.
NT Mode
All four channels are configured in NT (Network Termination) as defined in I.430.
TE Deactivation is not used in NT mode, and Layer 1 is always in active.
Note
Note