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FREQUENTLY ASKED QUESTIONS ABOUT THE EX74 1. Is there a limit to the number of EX74's that can be attached? No. You can attach one to any physical port on your controller or mux. SNA protocol defines the number of LU's and so long as there are LU's available, EX74's can be used to add physical ports. If there are 200 LU's available, all 200 can be converted to single session coax ports. 2. Do I need more memory for the controller? No. The EX74 is a self contained unit with sufficient memory and processing power to handle the additional terminals with no burden on the controller. 3. Will the EX74 slow the system down? No more than any method of adding capacity. In fact it may be slightly faster than a multiple controller approach due to polling reductions. 4. Is the EX74 compatible with 3299 mux's and/or passive doublers? Yes. With a doubler two EX74's can be attached with five terminals on each. With a 3299, an EX74 with five terminals can be attached to each mux port giving the user forty devices on one controller cable. 5. Is coax cable necessary? No. The same DPC connector used on the IBM 3174 is used on the EX74 so if you have the correct adapter connector, twisted pair works fine. Using IBM twisted pair medium, there is no distance degradation. With lesser cable types, distance is reduced accordingly. Standard telephone cable typically allows 800-1200 ft. 6. If my controllers are attached to a token ring, can it still be expanded with EX74's? Yes. EX74's can be used to expand either a gateway controller or a downstream node controller, eg 3174-13R. 7. If my controller is attached to the mainframe by way of a channel extender, can it still be expanded with EX74's? Yes, - copper, fiber or T1 extenders. 8. Can I attach any coax device? Any CUT coax device; that excludes DFT graphics terminals. 9. Can I attach the EX74 to any coax controller? Yes, so long as the controller is plug compatible with the IBM 3x74 and supports DFT devices. All IBM 3174 models and most 3274's are compatible. That includes controllers from Mem-Telex, Harris, Ideacourier and McData. 10. Will the EX74 support PC's and file transfer? The EX74 has been tested successfully against a large variety of PC coax platforms/ terminal emulation software. It supports IND$ file transfer. 11. Can I use the EX74 in a Bisync environment? Yes, but expansion is limited to 32 devices. For example an 8 or 16 port controller can be expanded to 32 devices but a 32 port unit is limited to 32 ports. There still may be cable saving reasons to attach EX74's but expansion is limited by the basic protocol. 12. Is a printer connected to the parallel port host addressable? The EX74 supports five addressable devices; so with four coax devices and a parallel printer attached, the printer can be a system printer - 3287 emulation. If you have 5 coax devices attached, then the parallel port can be used only for screen copy by the attached terminals. 13. Do print jobs queue in the EX74? Yes. Each port has a full 66 line page buffer so the keyboard is unlocked immediately after issuing the print command. Users will see a productivity improvement because of this buffering. 14. Can I have multiple sessions on a display attached to the EX74? No. The EX74 converts host sessions into physical ports on a one for one basis. While technically feasible, the set-up complications are considered excessive for most users. We recommend leaving users needing multiple sessions attached directly to the controller and attaching only single session users to the EX74. 15. How does the 3 year overnight replacement warranty work? The user calls and identifies the problem. If the Insync Tech Support Group cannot solve the problem on the phone, an RMA/conditional purchase order is issued and a unit from "Hot Standby" sent out using an express service. The user returns the discrepant unit. If the discrepant unit is not received back within 30 days, the RMA converts to a purchase order and an invoice issued accordingly. |
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