Specifications

Chapter 1 Introduction IPmux-11 Installation and Operation Manual
1-2 Overview
Features
E1
The E1 port complies with G.703, G.704, and G.823 standards. E1 framers comply
with G.704. The E1 framers support unframed, framed, CRC-4 MF and CAS MF
framing. The E1 port supports long haul and short haul input signals and can be
monitored for alarms and error statistics.
T1
The T1 port and framers comply with ANSI T1.403, G.703, and G.704 standards.
T1 jitter performance is according to G.824 and TR-62411. The T1 framers
support unframed, SF, ESF and Robbed Bit signaling. The T1 port supports long
haul and short haul input/output signals and can be monitored for alarms and error
statistics. FDL and transmit performance monitoring for T1/ESF are also supported.
Ethernet Ports
IPmux-11 is available with three Ethernet ports (two user and one network port).
The Ethernet ports work in the following bridge modes:
• Transparent
• Tagged
• Untagged
• Double Tagged.
Half-duplex operation in the IPmux-11 network port is not recommended when
transmitting small-size packets, because collisions and backoffs cause large delay
variation and may exceed the delay variation buffer tolerance at the receiving end,
resulting in buffer underflows and errors.
IP
The data stream coming from the E1 or T1 port is converted into IP packets that
are transported over the Fast Ethernet ports, and vice versa.
TDM bytes are encapsulated in a UDP frame that runs over IP and over Ethernet.
The number of TDM bytes in an IP frame is configurable for throughput/delay
tradeoff.
Each device has a single IP address (Host IP). A configurable destination IP address
is assigned to the IP packets. IP ToS field support can be configured for IP Level
Priority.
The Ethernet ports can be either UTP or fiber.
• Fiber option – standard 100BaseFx full-duplex port (see Table 1-1).
• UTP option – A standard 10/100BaseT half/full-duplex port with
auto-negotiation support. If auto-negotiation is disabled, Ethernet mode should
be configured.
Note