Month of July 2002 - Page Number 1

Showing 1 - 10 of 374 from July 2002
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  1. 1.
    This document details a method that can be used to determine the transmission order and priority of voice grant updates on an active channels based on Subscriber Unit (SU) affiliation and current channel assignment. This method is used to advertise voice grants on an active channel in a timely manner and in a way that...
    IPCOM000009017D | Original Publication Date: 2002-Jul-31
  2. 2.
    Installation and service of frequency converters are improved by using a power socket. The power socket is mounted to a wall, and motor and mains cables are connected to terminals inside the power socket. Then the frequency converter is put on top of the socket. The socket may incorporate a metallic plate for earth...
    IPCOM000009016D | 2002-Jul-31
  3. 3.
    Most protocols operate by setting a timer when data is transmitted. If no acknowledgment for this data is received before the timer expires then the data is transmitted. An enhancement to this is to send a message when the timer expires requesting a new acknowledgment. This technique is sometimes referred to as...
    IPCOM000009015D | Original Publication Date: 1999-Jan-01
  4. 4.
    Spiral inductors of relatively low manufacturing accuracy are constructed on a PCB. An indication of the inductors' values is marked on the PCB. Parts can then be added to the PCB later in such a way as to compensate for variation between the inductors' actual and optimum values.
    IPCOM000009014D | Original Publication Date: 1999-Jan-01
  5. 5.
    The lower priority outbound signaling packets (OSPs) that exist in the OSP sequencer do not need to be transmitted as frequent as the higher priority ones. This becomes critical when the control chan- nel is fully loaded with OSPs because if the lower priority OSPs are transmitted as frequent as the higher priority...
    IPCOM000009013D | Original Publication Date: 1999-Jan-01
  6. 6.
    Motorola tmnked systems use system IDS, talk- group IDS and individual IDS to control system access. Unauthorized users, equipped with valid IDS, may compromise the privacy and even the reli- ability of a trunked system. Encrypted radio com- munication can be a solution, but price and export regulatory barriers limit...
    IPCOM000009012D | Original Publication Date: 1999-Jan-01
  7. 7.
    The Top Popper is a hex tool bit used in a stan- dard hex drive hand tool. The Top Popper has a machined extension to provide a lip designed to pro- vide leverage to remove snap-on covers used on modules such as Quantar exciters and receivers, and iDEN power amplifiers.
    IPCOM000009011D | Original Publication Date: 1999-Jan-01
  8. 8.
    Heatsinking has always been one of the main challenges in the mechanical design of electrical systems such as engine management modules. A cost-effective solution to dissipate the heat of SMT components on FR4 substrate had to be developed considering the following requirements: wide) were used, but different features...
    IPCOM000009010D | Original Publication Date: 1999-Jan-01
  9. 9.
    A common feature of many microprocessor (and digital signal processor) systems is an area of non- volatile memory that holds the boot code for the processor. Sometimes this boot code needs to be overwritten (e.g. for updating to a more recent ver- sion). However if the boot code becomes corrupted due to some...
    IPCOM000009009D | Original Publication Date: 1999-Jan-01
  10. 10.
    The FCC Report and Order (CC Docket No. 94- 102) states that, if so requested by the PSAP (Public Safety Answering Point), the wireless carrier must send all 911 calls to the PSAP. This infers that all subscriber units must be able to place a 911 call.
    IPCOM000009008D | Original Publication Date: 1999-Jan-01