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This list of Frequently Asked Questions (FAQs) is meant to help you get answers to some of your most common types of questions relating to CQ and CQ's productivity, connectivity, and security solutions. These include questions about CQ’s products and services, how CQ’s products relate to different hardware devices, and general questions about synchronous communications. If you have other questions, you can e-mail CQ for more information.
Synchronous Communications Overview
What is the difference between asynchronous and synchronous communications?
Both of these forms of communication are a means of transmitting data. The difference is in the format that the data is transmitted.
Asynchronous communications is the method of communications most widely used for PC communication and is commonly used for e-mail applications, Internet access, and asynchronous PC-to-PC communications. Through asynchronous communications, data is transmitted one byte at a time with each byte containing one start bit, eight data bits, and one stop bit, thus yielding a total of ten bits. With asynchronous communications, there is a high amount of overhead because every byte sent contains two extra bits (the start and stop bits) and therefore a substantial loss of performance.
Synchronous communications is the more efficient method of communications. CQ’s connectivity solutions communicate through the synchronous method of communications.
Through synchronous communications, data is transmitted as frames of large data blocks rather than bulky individual bytes. One advantage of synchronous is that control information is easily inserted at the beginning and end of each block to ensure constant timing, or synchronization. Another advantage of synchronous is that it is more efficient than asynchronous. For example, a 56 Kbps dial-up synchronous line can carry 7000 bytes per second (56000/8) compared to a 56 Kbps dial-up asynchronous line which can only carry 5600 bytes per second (56000/10). When transmitting large amounts of information, this translates into a significant increase in speed and performance.
What is host connectivity and how does terminal emulation relate to it?
The HOST END (IBM® mainframe or midrange computer) determines the type of communications. If the HOST END stipulates synchronous communications, then the PCs or Local Area Networks (LANs) that connect to it must use synchronous connectivity solutions to access the host’s applications. These solutions include terminal emulation software products that emulate IBM’s industry standard specified protocols. Protocols include batch file transfer programs (3770 and 3780) and interactive database access programs (3270 and 5250). CQ’s software solutions emulate these protocols to provide access to IBM hosts.
Which type of communications relates to CQ’s PC-to-Host connectivity solutions?
Synchronous. CQ’s protocols for file transfers are based on IBM’s specifications. These synchronous protocols include interactive data base access 3270 and 5250 protocols and batch file transfer 3770 and 3780 protocols.
What are the host communications protocols that CQ provides?
There are several different communications protocols that you can use to communicate with a host. These protocols are split into two unique categories. The categories are Systems Network Architecture (SNA) and Binary Synchronous Communications (BSC), or Bisync.
What is the difference between the SNA and BSC protocols?
SNA and BSC are separate sets of network protocols developed by IBM for IBM’s mainframe computers.
Many of CQ’s solutions also use the Synchronous Data Link Control (SDLC) protocol for mainframe synchronous communications. SDLC is a protocol used in IBM’s SNA networks. SDLC is similar to HDLC.
What are the SNA protocols as defined by IBM?
What are the BSC protocols as defined by IBM?
What are the types of IBM-compatible mainframes and hosts?
IBM compatible mainframes include IBM ES/9000®, S/390®, S/370™, and S/3090™ mainframes as well as compatible systems manufactured by companies such as Amdahl® and Hitachi®. IBM-compatible midrange computers include IBM AS/400 and System/3x hosts.
Which protocols does CQ emulate?
CQ offers connectivity solutions for Microsoft’s® Windows® 32-bit operating systems, including Windows 95, Windows 98, Windows NT®, Windows 2000, and Windows XP. These solutions include CQ-3770®, CQ-3780®, and CQ-3270®.
For more information on all of CQ’s connectivity solutions, use any of the following contacts:
- E-Mail Address email@cq-comm.com
- Internet Address http://www.cq-comm.com
- Phone Number (770) 844-0233
(M-F, 9:00 AM to 5:00 PM EST, excluding certain holidays)
AutoSync 2 modems communicate synchronously directly through the PC’s asynchronous serial port without the need for an additional internal synchronous adapter card.
The AutoSync 2 feature is a technology available in a limited number of external, internal, and PCMCIA modems. AutoSync 2 modems use the PC’s standard asynchronous communications port for synchronous communications, eliminating the additional expense of an internal synchronous adapter card as well as the additional maintenance costs associated with the card.
Does CQ support the AutoSync 2 technology in its communications software?
CQ was the first software manufacturer to support the AutoSync 2 technology in its synchronous host connectivity solutions. CQ continues to support AutoSync 2 in all of our software emulation products
How does the AutoSync 2 feature help me communicate synchronously?
With the AutoSync 2 technology, users can dial-up remotely to hosts at speeds between 9600 bps and 33.6 Kbps. CQ has designed its software to interact with the AutoSync 2 feature to provide a direct PC-to-host or LAN-to-host synchronous link without an internal synchronous adapter card. Novice computer users and non-technical people in the field do not have to open the PC to install a card and, since there is no card, there is never card failure.
Which modems support the AutoSync 2 technology?
The Hayes OPTIMA™ line of modems are the only modems that support the AutoSync 2 technology. Hayes OPTIMA modems currently available include:
- OPTIMA 56K External Business
- OPTIMA 56K Internal Business
- OPTIMA 336 External Business
- OPTIMA 336 PCMCIA
Hayes AutoSync 2 modems are available
directly from CQ!
Contact CQ for more
information.
What is the "AutoSync 2 Advantage" as it relates to CQ’s connectivity solutions?
AutoSync 2 modems provide several benefits to users communicating with any one of CQ’s software emulations. These benefits include:
Check out CQ's newest Enterprise
Extender solutions - CQ-3770EE®
and CQ-3270EE®.
These new solutions allow SNA communications over existing IP connections
through IBM's Enterprise Extender technology for the ultimate in
convenient and reliable SNA interactive connectivity.
Use this link for a Technical Overview of Enterprise Extender.
If you have a question for CQ that was not answered on this page, please contact CQ or send an e-mail to email@cq-comm.com and a CQ Representative will respond to your request.
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email@cq-comm.com |