Installation and Operation Manual Chapter 1 Introduction
IPmux-11 Ver. 2.00 Functional Description 1-17
Internal
Switch
TDMoIP
E1 or T1 Port
Ethernet
Network Port
Ethernet
User Port 1
Ethernet
User Port 2
Figure 1-11. IPmux-11 with Two Ethernet User Port
Priority is always given to TDMoIP packets inside the internal switch.
Switch Operation Modes
IPmux-11 offers two user LAN ports in addition to the LAN port on the network
side. The device performs switching at Layer 2. The switch supports both
transparent bridging and VLAN-aware bridging. The switch supports rate limiting of
traffic going from the user ports to the network port. It supports up to 1024 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:
Transparent
Untagged
Tagged
Double tagged.

Rate Limiter Option

In this option a rate limiter is available to limit user port traffic. This feature is
valuable when a limited bandwidth 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 by a lower-rate device 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.
Network and user traffic can be limited to the following data rates:
Network interface (egress) – 256 kbps, 512 kbps, 1 Mbps, 2 Mbps, 4 Mbps, 5
Mbps, 8 Mbps, 10 Mbps, 16 Mbps, 20 Mbps, 25 Mbps, 40 Mbps, 50 Mbps,
80 Mbps
User interface (ingress) – 256 kbps, 512 kbps, 1 Mbps, 2 Mbps, 4 Mbps,
8 Mbps, 16 Mbps, 32 Mbps, 64 Mbps
When the rate limiter is disabled, there is automatic per-port limiting of 64 Mbps
on every port, for protection against broadcast, multicast, and flooding, which
could otherwise saturate the channel. If the default VLAN priority is lowered, then
this automatic limit is lowered accordingly, to maintain this protection. Setting the
default VLAN priority changes the automatic rate limiting in the following manner:

Note