Specifications

IPmux-11 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-15
IPmux-11 contains an internal bridge where one of its ports is connected to a
TDMoIP interworking function, two external bridge ports is used as the user ports,
and the fourth is used as an Ethernet network port.
Internal
Switch
TDMoIP
E1 or T1 Port
Ethernet
Network Port
Ethernet
User Port 1
Ethernet
User Port 2
Figure 1-9. IPmux-11 with Two Ethernet User Port
Priority is always given to TDMoIP packets inside the internal switch.
Internal 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 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.
Network and user traffic can be limited to the following data rates:
Table 1-6. Rate Limiter Options
Network Interface User Interface
128 kbps, 256 kbps, 512 kbps,
1 Mbps, 2 Mbps, 4 Mbps,
8 Mbps
128 kbps, 256 kbps, 512 kbps,
1 Mbps, 2 Mbps, 4 Mbps,
8 Mbps, 16 Mbps, 32 Mbps,
64 Mbps.
Note