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ET/5025 Series Synchronous Communications Adapters
We have new MK5025 Parts for Sale! Contact us with your requirements.The Emerging Technologies ET/5025 series of synchronous communications adapters provide the highest level of functionality available for INTEL-type architecture machines. Combining performance and economy, the ET/5025, ET/5025-16 and ET/5025PQ adapters easily achieve 2Mbs performance with all of the feature flexibility required by today's diversified communications environment. The price/performance attributes of the products allow for a single solution for low speed and high speed applications, substantially reducing the cost of development and simplifying future enhancements. The ET/5025 and ET/5025-16 have RS-232 interface and can optionally be equipped with field-upgradable V.35, EIA-530, RS-449 or X.21 interfaces for high-speed operation. The ET/5025PQ PCI board had 1,2 or 4 ports with V.35, EIA-530 or X.21 interfaces. Smarter than "Intelligent" boardsThe term "intelligent board" has become an archaic term as host CPU speeds have exploded over the past several years. An "Intelligent" board incorporates a complete computer on-board, with a CPU and an SIO chip to off-load the communications overhead. They almost always use processors which are many times slower than typical host processors, causing hosts to wait while the slower board completes its tasks. These boards are very expensive to build, difficult to debug, and costly to maintain. In addition, they run the interrupt processing and communications protocols in software or firmware, which is very slow compared to hardware. The MK5025 and MK50H25 RISC ProcessorsBoth the ET/5025 and ET/5025-16 communications adapters utilize the MK5025 RISC-based processor, the most popular and powerful HDLC protocol processor on the market. HDLC processors implement all physical and link layer protocol processing (LAPB / LAPD / HDLC) in microcode, and can perform operations hundreds of times faster than software based implementations. Most of today's highest performance communications products utilize dedicated protocol processors (which off-load communications and interrupt overhead) with shared memory interface drivers. This type of implementation takes full advantage of modern 486 and Pentium CPU speeds, and eliminates the time consuming software handshaking required with most "intelligent" boards. Virtually all Ethernet boards on the market utilize this technique, as does the ET/5025 line of products. Boards implemented with dedicated HDLC processors are much easier to maintain and provide a high level of reliability due to the widespread use of the processors in every conceivable environment. Because of their functional simplicity, boards equipped with dedicated protocol processors substantially outperform "intelligent" cards at a much lower cost.
ET/5025-16 - The ultimate ISA performer
The ET/5025-16 board provides the highest possible performance from a 16-bit communications board on an ISA-compatible bus platform. The ET/5025-16 is specifically tailored for high-speed applications where bus throughput is a critical or limiting factor. The ET/5025-16 uses high speed static RAM to achieve zero wait state operation, producing bus throughput up to 33% higher than bus mastering and standard cycle access cards. The ET/5025-16 will operate at bus speeds up to 16mhz, allowing actual bus transfer rates of over 50Mbs. The ET/5025-16 features a 16-bit ISA/EISA compatible bus interface and can optionally be equipped with a second RISC processor on-board, providing 2 channels capable of 100% (single flag separation) communications throughput at speeds of 2Mbs. Because of its multi-processor design, there is no degradation of performance by adding a second T1 port. For further discussion on the architecture of this board and to see how we stack up against our competition, click here. SPECIFICATIONS: ET/5025-16
Hardware Compatibility: ISA, EISA Bus Width: 16 bits Operating Systems: MS-DOS, MS-WINDOWS, System V UNIX, BSD/OS, FreeBSD, NetBSD and Linux Interfaces: RS-232C, V.35, RS-530, RS-449, X.21 Data Rates:
Standards: CCITT X.25 1980 /1984 /1988, PPP, Frame Relay, HDLC, LAPB On-Board Processor: 1 or 2 MK5025/MK50H25 processors @ 10 mhz On-Board Memory:
Base I/O: 200h - 3E0h in 20h Increments IRQ: 2,3,4,5,7,10,11, or 15 Jumper Selectable Bus Throughput: Up to 50mb/sec Data Throughput:
Max Bus Speed: 16mhz ET/5025 - Economy without trade-offs |
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