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Model 922-DSLH – User Manual
7.0 Functionality
The main functions of the 922-DSLH card are to provide a bi-directional media conversion between copper
Ethernet, copper DSL, and optical data as well as providing two gateways between copper Ethernet and serial
data. The Ethernet interface is accessed via the backplane connector and the DSL and optics via the front panel
connectors. The network protocols supported by the serial data gateways are UDP, Modbus TCP and PPP. The
serial protocols supported are RS-232, RS-422 and RS-485. This gateway functionality is handled by two
microcontrollers uC1 and uC2 (one uC per serial channel) and two Ethernet switches (SWA and SWB).
In addition to the media conversion and serial to Ethernet gateways, the 922-DSLH provides, via the
microcontroller diagnostic, extensive diagnostics information including but not limited to card S/N, FW version,
card temperature, humidity (RH), voltage, current draw, card powered up time, card turn off events, SFP
diagnostics (including optical link status and TX/RX power levels), Ethernet copper port link and both DSL link
status and user-defined switch configurations. The DSL link configuration and serial gateway configuration can
also be controlled via the uC diagnostics.
7.1 Gateway Functionality (uC1-2)
The 922-DSLH is a gateway which provides the conversion between RS-232/422/485 serial data and Ethernet
packets. The card can be configured in one of four modes of operation: UDP Gateway, Modbus Gateway, PPP
Gateway or disabled (no gateway functionality).
7.1.1 UDP Gateway
Serial to UDP. The RS-232/422/485 serial data is received from the serial port and it is stored into a buffer.
When the buffer is full or user specified inter-frame timeout is reached, the gateway sends the data in the
buffer as a UDP packet to a user specified destination (configurable IP and UDP port).
UDP to Serial. The UDP packet is received from the card's Ethernet port and the gateway listens to a user
specified UDP source (configurable IP and UDP port). If any packet is received on the source, the gateway
sends out the data through the corresponding serial port immediately. In this mode, all serial port settings,
such as baud rates, flow control, parity, etc., are supported.
7.1.2 Modbus Gateway (Modbus RTU to Modbus TCP)
This mode has two configuration options: RTU slave and RTU master.
RTU Slave. When the gateway is configured to connect a RTU slave on its serial port, it will create a Modbus
TCP server and listen to the Modbus TCP port (port 502 by default). Once a TCP client is connected to this
port, the gateway will forward all Modbus request from the TCP client to the serial port. It also forwards all
responses from the RTU slave to the TCP client.
RTU Master. When the gateway is configured to connect a RTU master on its serial port, it will keep trying to
connect to the user specified Modbus TCP server until the connection is successfully made. Once the
connection is built, the gateway will forward all Modbus request from the RTU master to the TCP server. It also
forwards all responses from the TCP server to the RTU master.
Please note that only one TCP connection is allowed for each gateway. In this mode, flow control is not
supported. The support of data bits, stop bits and parity bit complies with Modbus specification.
7.1.3 IWIS PPP Gateway (PPP to IP)
The PPP to IP gateway creates a tunnel which passes Ethernet traffic between a serial device and an Ethernet
network. From PPP perspective, users can configure the gateway as either a PPP client or PPP server. When
it is configured as a client, its IP address is obtained from its counterpart – the PPP server. When it is configured
as a server, users have to specify the local (server) IP address, the remote (client) IP address and its network
mask. The current implementation on the 922-DSLH uses the Password Authentication Protocol (PAP) for user
authentication. The same user name and password should be used on both sides (the client and the server). In
PPP mode, the serial port should NOT be configured using software flow control.
Focal Technologies Corporation
Page 7-1
A Moog Inc. Company
Document No. 922-0677-00, Rev 1.0
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