RAD Data comm TDMoIP Gateway IPmux-16 - Manual (Page 15)

IPmux-16 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-7
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.