This document describes PCMCIA Fax/Modem Ethernet PC Cards, which are designed to provide advanced communication capabilities for portable computers. These cards integrate fax, modem, and Ethernet functionalities into a compact form factor, aiming to enhance connectivity and efficiency for users on the go.
Function Description
The PCMCIA Fax/Modem Ethernet PC Cards serve as multi-functional communication devices for portable computers. They are equipped with dedicated processors and memory to offload fax modem transmission tasks from the host computer's CPU, thereby freeing up system resources. This design ensures smoother operation and better overall system performance, especially during data-intensive communication activities.
The core functions include:
- Fax Modem Capabilities: The cards support both sending and receiving faxes from computers or fax machines. They incorporate high-speed modems with error correction and data compression features, which not only ensure reliable data transfer but also contribute to battery saving by allowing the notebook to run cooler and work faster.
- Ethernet Connectivity (Combo Cards): For the combo models (DME-336T and DME-560T), the cards also provide 10BASE-T Ethernet connectivity. This allows users to connect to local area networks (LANs) for high-speed data transfer. A key feature of the combo cards is the ability to transfer data with network stations and send/receive faxes concurrently in a single step, streamlining communication tasks.
- Data Transmission: The modems support high-speed data transmission, with options for up to V.34 33,600bps or 56,000 data transmission/reception, depending on the model.
Important Technical Specifications
The PCMCIA Fax/Modem Ethernet PC Cards adhere to several industry standards and offer a range of technical features:
- PCMCIA Compliance:
- PCMCIA Type II Release 2.1
- JEIDA 4.1
- PC Card 95
- Modem Speed:
- DME-336T and DM-336: 33.6Kbps (V.34)
- DME-560T and DM-560: 56Kbps
- Data Compression and Error Correction:
- V.42bis & MNP 2-5 data compression and error correction standards are supported, ensuring efficient and reliable data transfer.
- Fax Protocol:
- EIA/TIA 578 Class 1 compliant.
- Cellular Protocol:
- ETC (Enhanced Throughput Cellular) protocol for mobile cellular communication.
- Ethernet Standard (Combo Cards):
- 10BASE-T Ethernet connectivity.
- Connectors:
- RJ-11 phone cable plug for modem/fax connections.
- RJ-45 10BASE-T plug for Ethernet connections (on combo cards).
- Internal Components:
- Digital line protection.
- Internal DAA (Data Access Arrangement).
- Internal buffer memory provided, which means the cards do not consume system memory for their operations.
- Command Set:
- AT command set for modem control.
- Certifications:
- FCC Class B, CE Mark.
- Telecom Certifications: FCC Part 68, Japan PTT (JATE), German Telecom.
Usage Features
These PCMCIA cards are designed with several features to enhance user experience and operational efficiency:
- Advanced Engineering & Compact Design: The cards are built with advanced engineering principles, resulting in a compact design that is suitable for portable use.
- CPU Workload Alleviation: By having their own processors and memory, the cards handle fax modem transmission, reducing the burden on the host computer's CPU. This allows the computer to perform other tasks more efficiently.
- Fast Modem Speed & Battery Saving: The built-in high-speed modems, coupled with error correction and data compression, contribute to faster operation. This efficiency, in turn, helps save the notebook's battery life by allowing it to run cooler and work faster.
- Concurrent Operations (Combo Cards): The combo Fax/Modem Ethernet PC Cards offer the convenience of transferring data with network stations and sending/receiving faxes simultaneously in a single step. This multitasking capability is highly beneficial for users who need to manage multiple communication channels.
- Low Power Consumption: The cards are designed for low power consumption, which is crucial for extending the battery life of portable computers.
- Sleep Mode: They feature a sleep mode that activates when idle, further conserving power.
- Driver Support:
- LAN Drivers: ODI, NDIS 2.x, 3.x, Packet driver.
- Runs NE2000 drivers.
- Operation Environments: The cards are compatible with various operating environments, including:
- Novell NetWare 3.x, 4.x
- Microsoft Windows for Workgroups
- Microsoft Windows 3.1
- Microsoft LAN Manager
- Microsoft Windows 95
- Microsoft Windows NT 3.5x
Maintenance Features
While the document does not explicitly detail "maintenance features" in the traditional sense (e.g., cleaning instructions or repair procedures), several aspects of the design and functionality contribute to ease of use and long-term reliability, which can be considered indirect maintenance benefits:
- Internal Buffer Memory: The provision of internal buffer memory means the cards operate independently without relying on the system's RAM for their primary functions. This reduces potential conflicts and ensures consistent performance, minimizing the need for troubleshooting related to memory management.
- Digital Line Protection: This feature helps protect the card from electrical surges or anomalies on the telephone line, enhancing its durability and reducing the likelihood of hardware damage.
- Robust Driver Support: Compatibility with a wide range of LAN drivers (ODI, NDIS, Packet driver, NE2000) and operating systems ensures that the cards can be easily integrated into various computing environments. This broad support simplifies installation and reduces the effort required to keep the device operational across different system configurations.
- Industry Standard Compliance: Adherence to PCMCIA, JEIDA, and PC Card 95 standards ensures interoperability and ease of replacement if a card needs to be swapped.
- Telecom Certifications: Compliance with international telecom standards (FCC Part 68, Japan PTT (JATE), German Telecom) indicates that the cards meet regulatory requirements for reliable and safe operation in different regions, reducing the risk of issues related to network compatibility or legal compliance.
- CPU Workload Alleviation: By reducing the load on the host CPU, the cards indirectly contribute to the overall stability and longevity of the portable computer, as the system runs cooler and experiences less strain. This can be seen as a preventative measure against system-level issues that might arise from over-stressed components.
- Error Correction and Data Compression: These features ensure data integrity during transmission, reducing the need for re-transmissions and minimizing data corruption, which can otherwise lead to troubleshooting and data recovery efforts.
In summary, the PCMCIA Fax/Modem Ethernet PC Cards are versatile communication tools designed for portable computing, offering robust performance, broad compatibility, and features that enhance both user convenience and system efficiency.
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