Chapter 1 Introduction IPmux-1/1E Installation and Operation Manual
1-26 Functional Description
Ethernet User Port The Ethernet user port allows a user to aggregate both TDMoIP traffic and his
private network LAN traffic to a single Ethernet network connection without
requiring an access switch. This is a cost effective solution for MTU or small office
applications. A rate limiter to restrict user port traffic is supported.
IPmux-1/1E contains an internal switch where one of its ports is connected to a
TDMoIP interworking function, another external switch port is used as the user
port, and the third is used as an Ethernet network port.
Internal
Switch
TDMoIP
E1 Port
Ethernet
Network Port
Ethernet
User Port
Figure 1-18. IPmux-1/1E with Ethernet User Port
Priority is always given to TDMoIP packets inside the internal switch.
Internal Switch Operation Modes
IPmux-1/1E offers a user LAN port in addition to the LAN port on the network
side. The device performs switching at level 2. The switch supports both
transparent bridging and VLAN-aware bridging. The switch supports rate limiting of
traffic going from the user port to the network port. It supports up to 12K MAC
addresses (depending on their values and the order in which they are learned).
The switch modes are described later in this section. They are:
• Basic mode
• User Tagged mode
• User Untagged mode
• Rate mode
• Rate + User Tagged mode.
• Rate + User Untagged mode
Rate Limiter Option
In this option a rate limiter is available to limit user port traffic. This feature is
valuable when a limited bandwidth DSL modem, for example, is used to extend
the Ethernet link (generally when the Ethernet link rate is limited/shaped to a lower
rate after IPmux). In this case TDMoIP packets will be dropped in the modem
even if it was prioritized at the IPmux internal switch. This is prevented by limiting
the user port to actual link rate minus TDMoIP bandwidth. The rate limiter can
limit user traffic at 50 kbps steps up to 5 Mbps and in 1 Mbps steps from 5 Mbps
to 100 Mbps.
Note