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Emergency Atarm / Call <br /> Emergency AlarmlCall provides users the ability to inform dispatch personnel of a life- <br /> threatening situation. By depressing the radio's Emergency Alarm button, an alarm is sent to the <br /> dispatcher. Upon activation of the emergency radio's Push-T'o-Talk, a channel is assigned for a <br /> predetermined amount of time. In the event that all voice channels are occupied, the system is <br /> capable of functioning in one of the following two modes: <br /> Emergency Top-of-Queue <br /> If all voice channels are occupied when an emergency call is made, then the r�nit initiating the <br /> emergency shall be placed at the top of the busy queue list and allowed access to the next <br /> available voice channel. The emergency unit shall be given the highest level of priority <br /> regardless of how many units are already in queue. As soon as any user of any of the busy <br /> channels de-key,the emergency caller is granted the channel. This virtually eliminates channel <br /> contention and assures the first available, clear channel will be assigned. <br /> Emergency Ruthless Preemption <br /> If all voice channels are occupied when an emergency call is made,then the unit initiating the <br /> emergency shall be allowed access to the voice channel with the lowest priority user currently <br /> assigned. It must be noted that until the current user de-keys, there will be RF contention <br /> between the emergency user and the current transmitting unit. Once the non-emergency user de- <br /> , keys, the channel belongs to the emergency user. <br /> Call Alert <br /> Call Alert allows you to initiate a signal that notifies the user to call back the alerting party. Call <br /> Alert capability helps ensure that important messages get through, even if the called party is away <br /> from the vehicle. In addition, Call Alert signaling takes place over the system control channel, <br /> which helps to preserve valuable voice channels for other communications. <br /> STARCOM21 Wide Area Radio Roaming <br /> Motorola's STARCOM21 wide area trunking system offers a sophisticated set of radio roaming <br /> features and capabilities simplifying user operation of the radio while ensuring that the radio is <br /> operating on the optimum site. Motorola's wide area roaming features and benefits are described <br /> below: <br /> Automatic Site Registration <br /> Automatic Site Registration is the automatic registration process that takes place whenever a <br /> radio is turned on or when the user roams from one trunking site to another. No operator <br /> intervention is required. This important feature enables continuous call processing for the user <br /> and effortless user roaming throughout the system. <br /> De-Registration <br /> There are three instances when a radio unit will de-register fi•om a site. The first method is when <br /> a radio unit is turned off. The radio will perform a soft power down de-registering itself with the <br /> Zone Controller. The second way is when a user moves from one site to another. Automatic Site <br /> Registration occurs at the new site, and the Zone Controller automatically de-registers the radio at <br /> the old site. The third way a radio unit is de-registered is via a Time-Out Timer. De-registration <br /> CSA.NoESS.FINAL.4-8-08 5 <br /> Motorola Contract No.08-17033/LF <br />