User manual GAI-TRONICS PL1877A INSTALLATION AND SERVICE MANUAL

[. . . ] 43004-019C GAI-TRONICS® CORPORATION A HUBBELL COMPANY PL1877A (MRTI 2000) Microprocessor Radio Telephone Interconnect Installation and Service Manual GAI-Tronics Corporation 400 E. Mohnton, PA 19540 USA 610-777-1374 800-492-1212 Fax: 610-796-5954 VISIT WWW. GAI-TRONICS. COM FOR PRODUCT LITERATURE AND MANUALS CONFIDENTIALITY NOTICE This manual is provided solely as an operational, installation, and maintenance guide and contains sensitive business and technical information that is confidential and proprietary to GAI-Tronics. GAI-Tronics retains all intellectual property and other rights in or to the information contained herein, and such information may only be used in connection with the operation of your GAI-Tronics product or system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any third party. [. . . ] First, you can program the PL1877A (via parameter 25) to extend the direct access duration if mobile carrier is detected. The other method of extending the direct access duration is to require reception of a wildcard access code that includes the paged mobile's capcode or user ID digits. For example, suppose the PL1877A is operating in single-mode selective signaling and has just paged a mobile whose QuickCall II capcode is 023. If the PL1877A receives a wildcard access code that includes some or all of the digits 0, 2, and 3, the time allotted for direct access is extended to the overall access duration (parameter 357). Suppose the PL1877A is operating in multi-mode selective signaling and has just paged a mobile whose user ID is 56. If the PL1877A receives a wildcard access code that includes the digits 5 and 6, the time allotted for direct access is extended to the overall access duration. Programming the Wildcard Template for Use with Selective Signaling To program the wildcard template such that the wildcard access feature functions as described for selective signaling, follow the steps of this section: 1. If you wish to allow only the paged mobile user to answer a page (without direct access), restrict mobile access to users of multi-digit access prefixes by setting parameter 38 to 1. Also, disable all standard multi-digit access prefixes by setting parameters 362­385 to FF (hexadecimal FF). Determine the manner in which the mobile's capcode digits or user ID is to be encoded into the wildcard prefix. For example, suppose you have decided that wildcard prefixes are to consist of 5 digits represented by X X X X X. Since the PL1877A is programmed for multi-mode selective signaling, you want the 2-digit user ID (represented by YY) to be encoded into the wildcard prefix. There are a number of ways you can encode the user ID into the wildcard prefix. You must now determine what will be placed in those locations marked by X. You may either place fixed digits (0-9, A-D) in these positions or you may place wildcard digits (F) in them. Of course, you may also place a mixture of fixed and wildcard digits in them. Y12Y3 Y1FYF YFFYF 75 12/10 Operator Instructions PL1877A Microprocessor Radio Telephone Interconnect 5. For the example above, you have chosen Y 1 F Y F as the required wildcard structure. The last digit of your wildcard structure must be programmed into parameter 535. Thus, you would program parameters 530­535 as follows: parameter 530: FF parameter 533: F parameter 531: E parameter 534: E parameter 532: 1 parameter 535: F Notice that the Y digits (representing user ID digits) have been replaced by E (hexadecimal E). E is referred to as the capcode wildcard digit since it is actually a special wildcard digit that is replaced by capcode digits or the user ID digits. To complete the example above, suppose the PL1877A has just paged the mobile corresponding to user ID 56. The telephone user is waiting on a mobile answer since direct access is disabled. [. . . ] This occurs whenever the level of the ring component exceeds the threshold level of the positive and negative comparators. U402a functions as a differential mode amplifier, reflecting a high impedance load to the phone line. Phone line audio, entering U402a, is reduced in level by a factor of 20. 71. From this point the audio passes on to U402b, comprised as a gain stage of 26DB. [. . . ]