User guide

2." General Information
Overview
Thank you for selecting the RLH 16 Channel T1/E1 over IP/Ethernet multiplexer. This modular
multiplexer unit can be used to provide T1/E1 communication channels over Ethernet or IP networks.
The RLH 16 Channel T1/E1 multiplexer has many optional parameters, that can be modified by the user
to suite different application requirements. Please read this guide carefully before installing the product.
It is well known that the T1/E1 signal comes from PCM technology which is TDM in nature. It transmits
information in a constant bit rate of E1 2048kbit/s, TDM technology occupies fixed transmission
bandwidth, with QoS features suitable for real-time applications such as voice and video. The QoS
features include short and stable transmission delay, low jitter and wander, etc.
On the other hand, Ethernet is based on statistical multiplexing, transmitting and exchanging information
in packets. It does not take up a fixed transmission bandwidth, which is good for achieving higher
bandwidth utilization. But Ethernet technology does not provide adequate QoS for real time applications.
Until recently, voice and data were, and still are to a large extent, transported over two separate
networks. But the requirement for both types of information to be carried over a unified network is
growing rapidly. Packets over SONET/SDH techniques to integrate data into the TDM network have
been around for many years. But for voice over packet based data networks, most of the efforts are
spent on creating special equipment that specifically packets voice or video signals, such as equipment
used for VoIP.
However, to take advantage of the data network, it is neither cost effective, nor necessary to replace all
TDM based equipment with new packet based equipment. The RLH 16 Channel T1/E1 Mux can be used
to emulate transparent T1/E1 channels over an Ethernet with adequate QoS, so that most existing T1/
E1 based applications can be readily setup over Ethernet LANs and WANs. One such application is to
build T1/E1 links with low cost wireless LAN bridges, replacing much more costly microwave radios.
RLH 16 Channel T1/E1 over GE Features
• Provide 16 channels of T1/E1 over 1 a single Ethernet port.
• Provide 5 GE electrical ports and 1 GE optical port, 6 GE ports serve as network uplinks or users ports, any of the
5 GE electrical ports may act as an NM port
• Support Ethernet spanning tree protocol which enables normal work and protection in ring and mesh topology,
enabling very fast network protection
• User-friendly Web server supported for easy setup and maintenance, alarm log provided
•
Support SNMP V1/V2 network management ␣Ethernet built-in layer 2 switch, support VLAN, comply with IEEE
802.3Q and 802.3ad, support 802.1P.
• Provide two pluggable T1/E1 cards, each card supports 8 channels
• Point to point and point to multipoint application
• Stable T1/E1 clock recovery, low jitter and wander
• Low processing delay for T1/E1 channels, high bandwidth usage efficiency
General Information! RLH Industries, Inc. - 16 Channel T1/E1 over GE with Fiber! 7