Datex-Ohmeda F-LM1, Technical Reference Manual

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Datex-Ohmeda S/5 Light Monitor
Document No. 8000060-1
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3.2.3 Single PCMCIA socket
Single PCMCIA Socket meets PCMCIA type II. There is a push button for removing the DataCard.
DataCard connector allows to insert/remove the DataCard, when a monitor is switched ON.
3.3 Network option
3.3.1 Network controller
Network connection is 10Base-T and meets IEEE 802.3. Network connector is a modular jack, RJ-
45. The controller for network connection is a single chip network controller DP83907 (D3) by
National Semiconductor. It is connected to the ISA bus via a100-pin connector. The network
controller creates control signals to memory circuits and to status LEDs. Between the controller and
the network connector there are filters and isolation for transmit and receive signals.
3.3.2 Network controller configuration EEPROM
For Ethernet address and initializing the controller there is a serial EEPROM programmed by
manufacturer.
Ethernet address in the EEPROM is unique.
3.3.3 Communication memory
For transmit and receive buffers there are two 32 kB SRAM circuits. Reading from the receive buffer
and writing to the transmit buffer is done by CPU via Network controller. The network controller
maintains the state of the buffers.
3.3.4 Clock
For the communication there is a 20 MHz oscillator.
3.3.5 Signal filtering and isolation
10Base-T interface consists of a lowpass filter on the unisolated transmit side of the transformer
and a lowpass filter on the unisolated receive side of the transformer. The data transformer is
hospital grade approved.
On the isolated side of the transformer there is a common mode choke both for transmitting and
receiving lines.
3.3.6 Network connector RJ-45
Network Connector, modular jack RJ-45 is located on the rear panel of a monitor. All rear panel
connectors are described in Part II/Power Supply Unit 1.3.4.