Sun Microsystems 819-1207-11 manual Hdlc Mode

Page 39

HDLC Mode

The default operating mode used by the SunHSI software is the HDLC full-duplex protocol (mode=fdx). In this mode the transmitter is always enabled. The transmitter sends flag bytes continuously when it is not sending a data frame.

If no message is currently being transmitted, the driver will attempt to start sending its next message. At this point the driver indicates that it is busy transmitting, to prevent the transmission of another message concurrently. The driver also activates a mechanism that ensures that the transmit operation will not hang if the hardware is not responding.

When the transmission is completed, the busy mechanism previously set is cleared and the next message can be transmitted. If the transmission is hung an abort sequence is sent instead of the cyclic redundancy check (CRC), so that the receiver will not interpret the frame as valid data. The message is discarded, and the output error statistic is incremented, which allows for a proper recovery by higher level protocols.

The received data is buffered until a complete frame has been received. If any error occurs during the reception of a frame, the appropriate statistic is incremented and the frame is discarded.

IBM (SDLC) Mode

SDLC mode is designed to support IBM system network architecture (SNA) communications. It uses most of the same protocols used in HDLC mode, with two major exceptions:

■When the line is idle, instead of sending flag bytes the transmitter is disabled.

■The request-to-send (RTS) and clear-to-send (CTS) signals are used to gate transmission.

IBM Full-Duplex Mode

When the SunHSI software is set to this mode (mode=ibm-fdx), the software uses a full-duplex point-to-point communication protocol. Both ends of the link are expected to have RTS and CTS signals asserted at all times when data is being exchanged. When starting a message transmission, the interface raises the RTS signal and expects the CTS signal to be asserted immediately. If this is not done, all messages currently queued for transmission are discarded, and the write operation returns an error.

Chapter 4 SunHSI Utilities

19

Page 38 Page 40
Image 39
Page 38 Page 40
Contents Sun PCI High Speed Quad Port Serial Interface Adapter Please Recycle Contents Cable Pin Assignments & Signals SunVTS Diagnostic Testing Page Figures Page Table D-1 TablesPage FCC Class a Notice Regulatory Compliance StatementsICES-003 Class a Notice Avis NMB-003, Classe a Bsmi Class a Notice Page Declaration of Conformity Page How This Book Is Organized PrefaceRelated Documentation Typographic ConventionsDocument Feedback Documentation, Support, and TrainingPage Product Description Product Overview1SunHSI/U Adapter Features1Hardware and Software Requirements Hardware and Software RequirementsPage SunHSI/U Adapter Installation Installation ProcessTo Install the Adapter External Cabling RS-232 to RS-449 Connections Page Installation Overview SunHSI PCI Software InstallationHsip Before Installing the Software Verifying the Software and Hardware RequirementsTo Remove Older Versions of the Software To Install the SunHSI Software Installing the SoftwareAt the ok prompt, type the boot command with the -roption To Test the Installation Configuring the SoftwareTo Configure for Point-to-Point Protocol Edit the /etc/netmasks file as follows Hsipinit Utility SunHSI UtilitiesOperating Modes Options T1 Compatibility OptionsHdlc Mode Hsiploop Utility Hsipstat Utility Page Pin Assignments Cable Pin Assignments & SignalsDCD1A Appendix a Cable Pin Assignments & Signals RTS4A RS-449 Interface Signals Interface SignalsPage Null Modem Cable Requirements Building the Null Modem Cable Configuring Internal or External ClockingRS-449 Null Modem Cable RS-449 SignalsFigure B-1Null modem Cable Both Suns Supply Clocking Appendix B Null Modem Cable Requirements Figure B-3X.21 to RS-449 Converter To RS-449 ConverterData Signal Inversion T1 Inverted Data and Clock SignalsHdlc Zero Insertion Algorithm Bipolar with 8-Zero SubstitutionClock Signal Inversion Page Using the SunVTS sunlinkTest SunVTS Diagnostic TestingPage Viewing the Man Pages Man PagesTo View Man Pages in the C Shell Environment To View Man Pages in Bourne or Korn Shell Environments Glossary

819-1207-11 specifications

Sun Microsystems 819-1207-11 is a prominent model that showcases the company's legacy in server and workstation innovation. As part of Sun Microsystems’ commitment to providing powerful computing solutions, this model highlights key features and technologies designed for demanding enterprise environments.

One of the primary characteristics of the 819-1207-11 is its robust performance capabilities. Equipped with a high-speed processor architecture, this model supports multi-threading and multi-processing, allowing it to efficiently handle simultaneous tasks. This is particularly essential for businesses that rely on running numerous applications at once, ensuring high availability and responsiveness.

The 819-1207-11 is designed with extensive memory support, featuring scalability that can accommodate increased workloads as businesses grow. The architecture allows for ample RAM, which enhances the performance of memory-intensive applications, such as databases and enterprise resource planning (ERP) systems. This characteristic makes the system an appealing choice for organizations with evolving computing needs.

In terms of connectivity, the model is equipped with a variety of ports and interfaces that facilitate seamless integration into existing infrastructure. The incorporation of high-speed Ethernet support ensures fast data transfers and efficient network communication, which is vital for large data centers and cloud environments.

The storage capabilities of the 819-1207-11 also stand out. With support for advanced storage technologies such as RAID configurations, the system enhances data redundancy and performance. This is crucial for enterprise users who prioritize data integrity and availability.

Security features are also a hallmark of the 819-1207-11, with built-in mechanisms to safeguard sensitive information. Encryption technologies ensure that data at rest and during transmission is protected against unauthorized access, aligning with compliance requirements that many organizations must adhere to.

Furthermore, the system is designed with a focus on manageability. Integrated systems management tools allow IT departments to monitor performance, troubleshoot issues, and optimize resource allocation with ease. This simplifies operations, ultimately enhancing uptime and productivity.

Overall, the Sun Microsystems 819-1207-11 represents a blend of performance, scalability, and security, making it a compelling choice for businesses that require reliable computing solutions to drive their operations forward. Its technological advancements underscore the company's pivotal role in the evolution of enterprise computing.
Top Page Image Contents