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Chapter 2 Introduction
SeriaLAN is an Ethernet/802.3 Bridge through a WAN interface (RS-530 or X.21/V.11 or
V.35 or V.24/V.28). SeriaLAN is DTE equipment making a bridge through DCE equipment
(Synchronous Modem, DSL Modem , CSU/DSU, Fiber Optical Modem, etc). SeriaLAN uses a
store & forward mechanism. SeriaLAN is manageable by the network (LAN or WAN) through
TCP/IP protocol.
2.1. LAN Interface
SeriaLAN connects to other equipment of the local area network through its LAN Ethernet 10
/ 100 Base Tx interface.
To manage the burst of traffic, SeriaLAN stores Ethernet frames in a 400 frame buffer and
then transmits them at the speed of the serial link.
The Ethernet bridge transmits all frames with no exception : that includes broadcast frames.
Filtering consists of transmitting only frames whose destination address is not known
locally, i.e. it does not transmit frames whose destination address is locally known. This
feature optimizes the traffic between SeriaLANs and increases the data rate as seen from
the LAN side. The SeriaLAN bridge memorizes up to 10,000 local Ethernet addresses for this
filtering feature. The address of hosts that do not transmit nor receive frames for 3
minutes, is automatically cleared from this memory : method of aging.
2.2. Serial line interface
SeriaLAN connects through a serial interface software configurable as:
RS-530
V.35
RS-232/V.24/V.28
X.21/V.11
The DB25 connector is well suited for RS-530 and V.24/V.28. An adapter cable could be
necessary for the other modes:
V.35 - M34 M - ISO 2593
V.36 - DB37 M
X.21/V.11 - DB15 M - ISO4903
The remote half-bridge will be:
another CXR SeriaLAN