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MOTOTRBO TM

MOTOTRBO TM. LINKED CAPACITY PLUS. Communicate to a large field force across a wide area with a scalable, easy to use system… Wide Area Coverage Links adjoining single sites across an IP Network High Capacity Digital communication for up to 1200 users

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MOTOTRBO TM

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  1. MOTOTRBOTM LINKED CAPACITY PLUS

  2. Communicate to a large field force across a wide area with a scalable, easy to use system… Wide Area Coverage Links adjoining single sites across an IP Network High Capacity Digital communication for up to 1200 users using 12 voice paths per site across 5 sites Cost Effective Does not require additional hardware Linked Capacity Plus Value Proposition • “Connect More People, In More Locations, For Less”

  3. Linked Capacity Plus OVERVIEW • Combines all the benefits of IP Site Connect and Capacity Plus • Adds CAPACITY to existing IP Site Connect (IPSC) systems • Adds COVERAGE to existing Capacity Plus (Cap+) systems • No central controller needed • Logic is managed in a distributed fashion like Cap+ • Does not use a dedicated control channel • Resilient to channel interference • Suitable for shared channels • Repeaters (Peers) / sites connected via an IPv4 based network like IPSC • Linked Capacity Plus (LCP) requires more bandwidth than IPSC • Consists of up to 5 sites • Up to 6 trunked (voice and data) & 3 data revert repeaters per site • Same number of repeaters per site not required • Tolerates failures by design • The Master repeater is the single point of failure, however this single point of failure is limited only to the arbitration of IP addresses

  4. Site 1 Site 2 Site 3 BR 11 BR 21 BR 31 Master BR 22 BR 32 BR 12 BR 23 BR 33 BR 13 BR 24 BR 14 Switch Switch Switch Router Router Router WAN IP Network Rest Channels Linked Capacity Plus OVERVIEW }= A set of Single-Site Capacity Plus systems + Physical connection like an IP Site System + Some additional software Linked Capacity Plus System Wide Master Capacity Plus Trunking IP Site Connect Link Management, Wide Area call processing Additional Software  Dynamically forms an IPSC between the current Rest channels Identifies the Rest channel Combines the Call set-up procedures (i.e. Arbitration + TRT) Can use MTR3000 and/or 32MB DR 3000 repeaters (but NOT 8MB DR 3000 repeaters).

  5. Linked Capacity Plus OVERVIEW Features • Includes the following MOTOTRBO “special” features • Enhanced privacy • Transmit Interrupt • Digital telephone patch • GPS (including enhanced) • Data applications (ADP interfaces) • Option board • RDAC • Includes the following trunking system features • Selective site light-up: • Dynamic for individual calls • Static for talkgroup calls • Automatic subscriber roaming • Site restriction

  6. Supports up to 254 Local and Wide Area TALKGROUPS • Local and Wide Area Talkgroups • The ID space for Talkgroups is limited to {1..254} • A customer can define some of these IDs (say “w”) as Wide Area • The remainder of the IDs are Local • Local Talkgroup IDs can be reused at different sites • Thus, total number of talkgroups = (254 – w) * s + w(where “s” is the number of sites) • No local channels like IPSC • No local All Call Talkgroup • A Wide Area Talkgroup ID is associated with a set of sites • Enables Statically defined Selective site “light up” for Talkgroup calls • A number of channels at each site can optionally be reserved for Wide Area talkgroup calls. • All Wide Area talkgroup repeater configuration parameters are provisioned into the Master repeater only. Linked Capacity Plus OVERVIEW Features

  7. LCP data is similar to Cap+… • Radio to Radio data is always on a trunked channel • Server to Radio data is always on a trunked channel • Radio to Server data is either on a trunked or data revert channel • Radios share the revert channels • LCP data is similar to IPSC… • Supports both local and wide area data revert channels • A wide area / local setting is configured into all data revert repeaters • A wide area data revert channel is formed by multiple data revert channels (one per site) sharing a common Channel ID • Initially, LCP supports server data via Control stations ONLY • In the future, LCP will also support server data via the repeater IP interface Linked Capacity Plus OVERVIEW Features - Data

  8. Linked Capacity Plus OVERVIEW Features - Data Flexibility for configuring Data Revert Repeater Channel IDs. Example System 1 Site 1 (Ch ID 33W) Site -2 (Ch ID 33W) Site 3 (Ch ID 33W) Site 4 (Ch ID 33W) Site 5 (Ch ID 33W) Example System 2 Site 1 (Ch ID 33W) Site -2 (Ch ID 33W) Site 3 (Ch ID 33W) Site 4 (Ch ID 35W) Site 5 (Ch ID 35W) Example System 3 Site 1 (Ch ID 33L) Site -2 (Ch ID 33L) Site 3 (Ch ID 43L) Site 4 (Ch ID 47L) Site 5 (Ch ID 47L)

  9. Linked Capacity Plus OVERVIEW Features • LCP does not support… • Priority Queuing of Calls • Requires a central controller • Priority Monitor* • This is however supported for All Call and Emergency call • Subscriber Access Control • Will however be supported in a release later this year • (* this is the ability for radios to leave a call in progress to join a higher priority call)

  10. For the purpose of the following: • T = Total number of Radios supported by LCP system • R = Number of Radios supported by Cap+ system • N = Number of trunked channels at the smallest LCP site • S = Number of LCP Sites • W = Average number of Sites associated with Wide Area Talkgroups • L = Number of Local calls as a fraction of the total number of calls • A LCP system handles Local calls as efficiently as Cap+, therefore if all calls are Local, T = the sum of the number of radios supported by each individual site. • The number of radios supported by a given LCP site = the number of radios supported by a Cap+ system having the same number of trunked channels. • If there are Wide Area calls, T is estimated by first estimating R for a Cap+ system having N trunked channels (note: Wide Area calls generally take 240ms longer to start). • If all calls are Wide Area, T = R. • If there are a mixture of both Local and Wide Area calls, T = R*S (L + (1-L)/W) Linked Capacity Plus OVERVIEW System Loading

  11. Linked Capacity Plus OVERVIEW • Requires a software upgrade of radios and repeaters • Repeaters must have 32MB of flash memory • Compatible with current and next generation MOTOTRBO radios • Requires feature activation in the repeater • HKVN4108A DR 3000 Full license key* • HKVN4063A DR 3000 Incremental license key (from Cap+) • HKVN4109A MTR3000 Full license key* • HKVN4070A MTR3000 Incremental license key (from Cap+) • New LCP compatible version of RDAC available • GMVN5520F RDAC CD • * The full LCP license does not support Cap+ channels, so if a repeater needs also to support Cap+ channels then a Cap+ / Incr. LCP license combination should be purchased instead.

  12. New New New Old Old Old New New Linked Capacity Plus OVERVIEW Backwards compatibility with Cap+ An old (non-upgraded) Cap+ radio will only operate on a single LCP site. However, its ID must still be unique across all sites for the LCP system. Site 1 Site 2 • Old radios can neither make nor receive Wide Area Individual Calls • Old radios can receive incoming audio targeted to a Wide Area TG but can not transmit audio to a Wide Area TG. • Compatible Individual calls • Compatible Group calls • Incompatible Calls (1) (1) (1) (2) (2) Local TG Wide Area TG

  13. Rest Channels Site 2 Site 3 Site 1 BR 21 BR 31 Master BR 11 BR 22 BR 32 BR 12 BR 23 BR 33 BR 13 BR 24 BR 14 Router + Switch WAN IP Network Linked Capacity Plus COMPONENTS Complete System System Wide Master TRNK CS TRNK CS LAN Network LAN Network LAN Network Conv CS BR 34 Conv CS RDAC PC1 Router + Switch Router + Switch Data Revert Repeaters (Optional)

  14. Rest Channels Site 2 Site 3 Site 1 BR 21 BR 31 Master BR 11 BR 22 BR 32 BR 12 BR 23 BR 33 BR 13 BR 24 BR 14 Router + Switch WAN IP Network Linked Capacity Plus Components The role of the “Master” System Wide Master • Requires a static IP address which all repeaters (via their configuration) need to be aware of • Introduces repeaters to each other • Is the single point of failure TRNK CS TRNK CS LAN Network LAN Network LAN Network Conv CS BR 34 Conv CS RDAC PC1 Router + Switch Router + Switch Data Revert Repeaters (Optional)

  15. Linked Capacity Plus Components • If the Master repeater fails… • The system continues to function • Additional repeaters, sites, or host PCs CANNOT be added to the system • A redundant repeater can be switched to act as a Master

  16. Rest Channels Site 2 Site 3 Site 1 BR 21 BR 31 Master BR 11 BR 22 BR 32 BR 12 BR 23 BR 33 BR 13 BR 24 BR 14 Router + Switch WAN IP Network Linked Capacity Plus Components The role of a Repeater (Peer) • Exchange “Keep Alive” messages • Use information to dynamically configure system • Participate in selecting the next Rest Channel • Distribute the voice/data payload to all repeaters TRNK CS TRNK CS LAN Network LAN Network LAN Network Conv CS BR 34 Conv CS RDAC PC1 Router + Switch Router + Switch Data Revert Repeaters (Optional)

  17. Linked Capacity Plus Components Communication among repeaters • LCP repeaters at a given site use IP Limited Broadcast address (255.255.255.255) messages to communicate among each other when managing (for example) the site’s Rest Channel (note: Cap+ repeaters communicate with each other using multiple unicast messages). • LCP repeaters at a given site are configured with a common Site IP Address (referred to as the Rest Channel IP Address by the CPS) and the current Rest Channel repeater at the site uses this Site IP Address when sending periodic Keep Alive messages to the other sites. • At the start of a new call the source Rest channel repeater does not know which are the current Rest channel repeaters at the other sites. The source Rest channel repeater therefore sends one message to each Site IP Address associated with the call (note: the source Rest channel repeater finds out from the Master repeater which Site IP Addresses to use). When a repeater at a given site receives a Site IP address message, it re-broadcasts this message to the other repeaters at that site using the IP Limited Broadcast address message (note: the repeater that receives the Site IP Address message will normally be the Rest channel repeater unless the Rest channel has changed since the last Keep Alive message was generated). The current Rest Channel repeater at the site then responds to the Site IP address message. This mechanism enables all repeaters involved in a call to learn which are the other repeaters (at the other sites) involved in the same call.

  18. Rest Channels Site 2 Site 3 Site 1 BR 21 BR 31 Master BR 11 BR 22 BR 32 BR 12 BR 23 BR 33 BR 13 BR 24 BR 14 Router + Switch WAN IP Network Linked Capacity Plus BACK END NETWORK LAN Network • Repeaters at a site are connected over a LAN like Cap+ • Repeaters use an IP Limited Broadcast address to communicate with all repeaters at its site • Only LCP repeaters should be present on the LAN TRNK CS TRNK CS LAN Network LAN Network LAN Network Conv CS BR 34 Conv CS RDAC PC1 Router + Switch Router + Switch Data Revert Repeaters (Optional)

  19. Rest Channels Site 2 Site 3 Site 1 BR 21 BR 31 Master BR 11 BR 22 BR 32 BR 12 BR 23 BR 33 BR 13 BR 24 BR 14 Router + Switch WAN IP Network Linked Capacity Plus BACK END NETWORK WAN IP Network • An IP Network is used for voice/data communication between sites like IPSC • Requires greater bandwidth (compared to IPSC) from ISP provider TRNK CS TRNK CS LAN Network LAN Network LAN Network Conv CS BR 34 Conv CS RDAC PC1 Router + Switch Router + Switch Data Revert Repeaters (Optional)

  20. Rest Channels Site 2 Site 3 Site 1 BR 21 BR 31 Master BR 11 BR 22 BR 32 BR 12 BR 23 BR 33 BR 13 BR 24 BR 14 Router + Switch WAN IP Network Linked Capacity Plus BACK END NETWORK Router + Switch • All repeaters (and only the repeaters) at a site must be behind a router and a switch TRNK CS TRNK CS LAN Network LAN Network LAN Network Conv CS BR 34 Conv CS RDAC PC1 Router + Switch Router + Switch Data Revert Repeaters (Optional)

  21. Linked Capacity Plus BACK END NETWORK Considerations • The Master repeater is the only repeater which must have a static IPv4 address, the other repeaters (and RDAC applications) may have either static or dynamic IP IPv4 addresses. • Since LCP repeaters at a given site use IP Limited Broadcast address messages to communicate among each other, then: • All repeaters pertaining to a given site must be behind a single Ethernet Switch/Router • This is because IP Limited Broadcast address messages never get forwarded by a site’s router to the WAN. • The only devices that can be on the site’s LAN are the repeaters pertaining to that site (and any RDAC applications) • This is because IP Limited Broadcast address messages (which are received by all devices on the LAN) could have an undesired effect on other devices. • Hairpinning routers generally* do not need to be used • Again, this is because IP Limited Broadcast address messages never get forwarded by a site’s router to the WAN. • * A Hairpinning router must be used at a site if that site contains multiple LCP devices and one of these devices is either a Master repeater or an RDAC application, since: • Peers need to address the Master repeater using its WAN address. • An RDAC application communicates directly with repeaters (rather than using IP Limited Broadcast address messages).

  22. Linked Capacity Plus BACK END NETWORK Considerations • If no more than 3 repeaters per site need to be supported, then the “D Link EBR2310” Ethernet Switch/Router should be sufficient. • For expanding the number of switch ports, the “HP Procurve 2510-24 (J9019B)” Ethernet Switch can be used in conjunction with the EBR-2310 Router. • The CISCO ASA-5505 (8 port) Switch/Router can also be used. • For a customer LAN, no Public IP address is required if a Remote IP network connection is not required from any other public network. If for example RDAC is required to be connected from the Public system without using a VPN configuration, then one Public static IP address is required. • Once the IP network is setup and rigorously tested (bandwidth analysis etc.), it is advisable not to change or keep changing IP network configuration. Overall quality and reliability of the LCP system is highly dependent upon a stable IP network. • Refer to the System Planner for details on how to calculate the bandwidth requirements of the backend network.

  23. All Start • A Wide Area Talkgroup call only starts if channels are available at all associated sites • Local calls can capture all the trunked channels at a site, leaving no channels available for Wide Area Talkgroup calls. To overcome this, LCP allows a configurable number of channels at each site to be reserved for Wide Area Talkgroup calls. • Call queuing is not supported, however a radio tries up to 3 times to setup a call with random delays inserted in between each attempt. • Selective Site Light Up for Individual Calls • An Individual call setup goes out on all sites where a channel is available. • These sites all attempt a high-speed handshake (called “RTR”) with the target radio. • The site that succeeds with the high-speed handshake and the site where the initiating radio is located remain in the call while the other sites drop out. If the initiating and target radios are on the same site this leaves 1 site involved in the individual call and if the initiating and target radios are on different sites this leaves 2 sites involved in the individual call. • The high-speed handshake occurs concurrently with the call set-up, so no additional delay. Linked Capacity Plus PROCEDURES

  24. Start of a Call • “TRT” in Cap+ restricts the effect of collisions. • “Arbitration” in IPSC ensures that all the sites select the same call. • LCP improves and combines these two processes into a single process called “TR-A-RT”. • This process can also allocate the channels for up to 5 concurrent calls (each occurring at separate sites) in one arbitration. • The Wide Area Call setup time for LCP is approximately 240 ms more than for Cap+ (this increases where more than 2 concurrent calls need to be allocated). • The Local Call setup time for LCP is same as for Cap+. • LCP supports Digital Telephone Patch Calls. • A radio can receive an incoming telephone call on any site, however a radio can only initiate an outgoing telephone call on a site connected to an APP (i.e. a radio can not initiate a telephone call via an APP connected to a different site). Linked Capacity Plus PROCEDURES

  25. Linked Capacity Plus procedures Wide Area Group Voice Call A radio starts a call on an idle Rest ChannelThe radio transmits a burst over the air and waits for the response from the Rest Channel. BR 11 BR 21 BR 31 1 BR 12 BR 22 BR 32 BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network Note: If two or more radios at a site start calls at the same time their call starts will collide, the Rest Channel repeater may not receive the transmission correctly and will not provide a response. If the radio does not get the response from the Rest Channel repeater it will retry after a random delay.

  26. Linked Capacity Plus procedures Wide Area Group Voice Call • 2.When a burst is received the Rest Channel repeater • Selects the next Rest channel (like Cap+) and informs the start of the call and the new Rest Channel to all repeaters at the site. • Tells the radio its call is conditionally accepted, starts an “arbitration window” (the duration depends on the inter-repeater delay) and asks the radio to wait for the final acceptance. • Invites the Rest Channels at the other sites to join the call (invitations sent using site common IP addresses). BR 11 BR 21 BR 31 2b 2c BR 12 BR 22 BR 32 BR 13 2a BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network Note: Each site has a common IP address. A message addressed to the common IP address is received by all the repeaters at the site.

  27. Linked Capacity Plus procedures Wide Area Group Voice Call • 3. When an invitation is received from the source repeater, the Rest Channel at the destination sites • Select the next Rest channel and inform the start of the call and the new Rest Channel to all repeaters at their sites. • Inform the non-participating radios the Rest Channel has changed. • Accepts or Rejects the invitation depending on the channel availability at its site. BR 11 BR 21 BR 31 3c BR 12 BR 22 3a BR 32 3b 3b 3a BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Switch Switch Switch Site 3 Router Router Router WAN IP Network

  28. Linked Capacity Plus procedures Wide Area Group Voice Call 4. During the “arbitration window”, if the source repeater receives no rejections from the sites associated with the talkgroup then it informs the source radio to start the call. If one or more rejections are received, then the source repeater asks the source radio not to start the call. 4 BR 11 BR 21 BR 31 BR 12 BR 22 BR 32 BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network

  29. Linked Capacity Plus procedures Wide Area Group Voice Call • 5. When permission is received to start a call • The source radio transmits a voice header followed by a voice burst every 60ms. • The source repeater sends the header/bursts to all repeaters participating in the call. • The destination repeater transmits the received header/bursts over the air. BR 11 BR 21 BR 31 5a 5b BR 12 BR 22 BR 32 5c 5c BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network

  30. D S Linked Capacity Plus procedures Private Voice Call Steps 1 to 4a of a Private Voice Call are the same as a Wide Area Group Voice Call. 4b. The destination repeaters ask the destination radio to respond by transmitting a query over the air. 4c. If the destination radio is present then it responds. 4d. If the destination repeater does not receive a response, it informs the source repeater it is not interested in participating in the call. 4a BR 11 BR 21 BR 31 4b 4d BR 12 X BR 22 4b BR 32 4c BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network S: Source Radio D: Destination Radio

  31. D S Linked Capacity Plus procedures Private Voice Call • 5. When permission is received to start a call • The source radio transmits a voice header followed by a voice burst every 60ms. • The source repeater sends the header/bursts to at most one repeater (i.e. the repeater which did not send a rejection). • The destination repeater transmits the received header/bursts over the air. BR 11 BR 21 BR 31 5a 5b BR 12 BR 22 BR 32 5c BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network S: Source Radio D: Destination Radio

  32. E A TG E E TG TG Linked Capacity Plus procedures Wide Area All Call A radio starts a Wide Area All Call on an idle Rest ChannelSteps 1 to 4a are the same as a Wide Area Group Call. BR 11 BR 21 BR 31 1 BR 12 BR 22 BR 32 BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network E : Radios participating in an Emergency Call TG: Radios participating in a Talk Group Call Note: LCP does not support Local All Call.

  33. E E E Linked Capacity Plus procedures Wide Area All Call 4b. The start of a Wide Area All Call is announced on the Traffic and Rest Channels of all sites 4c. All radios receiving non-emergency calls move to the channels where the Wide Area All Call is in progress. These radios make a late entry into the Wide Area All Call. BR 11 BR 21 BR 31 4a BR 12 BR 22 BR 32 4b 4b 4b BR 13 BR 23 BR 33 Master BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network E : Radios participating in an Emergency Call

  34. P P P Linked Capacity Plus procedures Phone Call (Radio to Phone) LCP supports only Private Radio to Phone Calls (i.e. no Talkgroup Radio to Phone Calls). A radio can only initiate a phone call at a site where there is at least one Phone Patch device. A radio starts a Phone Call on an idle Rest Channel by transmitting a burst over the air The Rest Channel provides the current status (i.e. busy or idle) of all “phone capable” channels at the site. 1 BR 11 BR 21 BR 31 2 BR 12 BR 22 BR 32 Phone Patch BR 13 BR 23 BR 33 Master Phone Patch BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network P: Radio initiating a call to a phone Note: If there is no idle phone capable channel at the site, the radio retries after a random delay

  35. P P P Linked Capacity Plus procedures Phone Call (Radio to Phone) • A radio moves to an idle phone capable channel and initiates a phone call. • The remaining steps are the same as for Private Voice Call. BR 11 BR 21 BR 31 BR 12 BR 22 BR 32 BR 13 BR 23 BR 33 Phone Patch Master Phone Patch BR 14 BR 34 Site 1 Site 2 Site 3 3 Switch Switch Switch Router Router Router WAN IP Network P: Radio initiating a call to a phone

  36. P P P Linked Capacity Plus procedures Group Phone Call (Phone to Radio) LCP supports both Private and Group Phone to Radio Calls. When a phone call is received, the Phone Patch activates the “PTT Line”, and the repeater requests, receives and verifies the DTMF digits. The repeater checks for an idle slot, and if a slot is idle starts the call. The source repeater invites the Rest Channels at the destination sites to join the call. After the “arbitration window”, the Rest Channel announces the start of the phone call. 4 BR 11 BR 21 BR 31 4 4 4 BR 12 BR 22 BR 32 3 Phone Patch 1 BR 13 BR 23 BR 33 Master Phone Patch BR 14 BR 34 Site 1 Switch Switch Switch Site 2 Site 3 Router Router Router WAN IP Network Note: If there is no idle phone capable channel at the site, the radio retries after a random delay P: Radio initiating a call to a phone

  37. P P P Linked Capacity Plus procedures Group Phone Call (Phone to Radio) The participating radios at the source site moves from the Rest Channel to the Phone Channel. The Rest Channels at the destination sites move. The Non-participating radios move to the new Rest Channels. BR 11 BR 21 BR 31 BR 12 BR 22 BR 32 Phone Patch BR 13 BR 23 BR 33 Master Phone Patch BR 14 BR 34 Site 1 Site 2 Site 3 Switch Switch Switch Router Router Router WAN IP Network P: Radio initiating a call to a phone Note: If there is no idle phone capable channel at the site, the radio retries after a random delay

  38. S E Linked Capacity Plus procedures Emergency Voice Call • An emergency call starts just like a talkgroup call unless • An Emergency Call to the same talkgroup is already in progress, in which case the call starts over the same channels either politely (after interrupting the ongoing call) or impolitely. • A Rest Channel at a site is not idle, in which case the Rest Channel drops the ongoing call and participates in the Emergency Call BR 11 BR 21 BR 31 This figure shows the state before the initiation of the emergency call. A radio a site 3 is sourcing an interruptible call for the emergency talkgroup. BR 12 BR 22 BR 32 BR 13 BR 23 BR 33 BR 14 BR 34 Site 1 Site 2 Site 3 BR 11 BR 21 BR 31 This figure shows the state after the initiation of the emergency call by a radio at site 1. Note that the Rest channels do not change and the radio at site 3 has stopped its transmission. BR 12 BR 22 BR 32 BR 13 BR 23 BR 33 BR 14 BR 34 Site 1 Site 2 Site 3

  39. Linked Capacity Plus procedures Emergency Voice Call User initiation of Emergency • LCP only uses impolite channel access for emergency calls (where necessary). • When a repeater detects an impolite call it updates the system call status to the new call. • LCP frees up channels at associated sites (if necessary) during an emergency call setup. • The start of an emergency call is announced over all busy channels at all associated sites, thereby allowing radios to leave their current calls and join the emergency call (where applicable). • After setting up an emergency call, if there are no free channels left at a site then the busy rest channel shifts to a channel where there is a non emergency call in progress (thus ensuring that one emergency call does not clear down another emergency call). Yes Radio on Traffic channel? Move to Rest Channel No Emergency Call for same Talkgroup already active? Emergency Call transmitted over ongoing Emergency Call because receiving radios already on channel. Yes No Yes Rest Channel Idle? Emergency Call transmitted on Idle Rest channel. No Call on busy Rest Channel interruptible? Transmit interrupt used to stop ongoing call. Emergency Call then transmitted on Idle Rest channel. Emergency Call transmitted impolitely over busy Rest channel. No Yes

  40. Linked Capacity Plus procedures Roaming • To minimise the amount of Beacon signalling • An LCP (Roaming) Beacon is appended to every 5th Cap+ (Lost Signal Detection) Beacon • To facilitate faster scanning • The Rest Channels at all the sites synchronise their Beacons • The LCP (Roaming) Beacons at a given site contain a list of Rest Channel IDs for that site’s neighbouring sites • Radios use the list of Rest Channel IDs for a site’s neighbouring sites to determine which channels to scan when trying to roam using either Passive or Active Site search • The list of neighbouringsites for each site isconfigured only into theMaster repeater (note:the Master repeatershares this informationwith all the otherrepeaters in the system) CPS Configurable Interval 5 * Cap+ Beacon Interval Site 1 Rest Channel Site 2 Rest Channel Site 3 Rest Channel Site 4 Rest Channel Site 5 Rest Channel Cap+ Beacon LCP Beacon

  41. Linked Capacity Plus procedures Roaming – Passive Site Search (Automatic Roaming) • For LCP a radio builds up a sorted roam list based on the LCP (Roaming) Beacons channels transmitted on the home site’s Rest Channels. • While the home site signal strength remains above a programmable threshold, the radio remains on the home site. • If the home site signal strength drops below a programmable threshold, then the radio starts to scan through the sorted roam list for a new site • The radio only scans for a new site while in the idle state (e.g. it does not scan for a new site while still receiving a call of interest on the current site). • Also, the radio does not scan for a new site if the radio’s Site Lock feature is enabled. • During a Passive Site search, the radio identifies the site with the strongest signal and then makes that site its new home site. • If a better site is not found, then the radio remains on the current home site and continues scanning. • While a radio is carrying out a Passive Site Search, it needs to leave its current home site for short durations which may cause the radio to miss activity on its home site (resulting in late entry to voice calls, or missed control/data). • To minimise missed activity, the programmable threshold should not be configured too high. • Additionally, a user may suspend automatic roaming using the Site Lock feature (this is particularly useful if the radio is stationary and the user is satisfied with the quality of service from the current home site).

  42. Linked Capacity Plus procedures Roaming – Active Site Search • Active Site Search consists of the radio sending wake-up messages to each site in its sorted roam list (which it builds up from the LCP Beacons) until it finds an active site. • Active Site Search is initiated as follows: • When the radio initiates a transmission and it’s home site rest channel repeater can not be woken. • Or, when the user initiates a Manual Site Roam (either using the menu or a programmable button). • On waking a repeater, the radio synchronises itself with the repeater, completes the transmission and makes the new site its home site. • If the end of the sorted roam list is reached and a site is not found, the radio provides the user with a failure indication. • Active Site Search does not necessarily find the best site, but rather allows the radio to move to the next “in range” site. • Radios only transmit a single (polite) wake up message to any given repeater, however there may still be regulatory reasons why it might not be desirable for a radio to transmit wake up messages on each of its sorted roam list member’s frequencies until a site is found. Where this is the case, then radios should be configured with Active Site Search disabled.

  43. Linked capacity Plus User Interface Home Screen Roaming Icon: Radio not in locked state. It will disappear after the user locks the site. Channel name Press PB to lock site Turn on repeaters Out of range state (Same as Cap+) Unlock state Lock State Radio’s LED will flash yellow if radio in system busy or local system busy state

  44. Linked capacity Plus User Interface Site Information Press Programmable Button to display site alias Site Alias Site Number Press site button to display site alias Press Programmable Button to find site Cannot find site Press PB to find site Successfully Found Site

  45. Linked capacity Plus CONFIGURATION Repeater - Network Select Master or Peer Similar Configuration to Cap+ (note: the LCP beacon interval is five times the Cap+ beacon interval and the LCP beacon duration consists of a single burst appended to every 5th Cap+ beacon)

  46. Linked capacity Plus CONFIGURATION Repeater - Talkgroups • Wide Area Talkgroups are associated with a set of sites • Enables statically defined Selective Site “Light-Up” • Any Talkgroup not defined in this table is assumed to be a Local Talkgroup • Subscribers do not need Wide Area or Local Talkgroup categorization • These parameters are configured in one repeater only (the “Master”)

  47. Linked capacity Plus CONFIGURATION Repeater - Talkgroups • Channels at each site can be reserved for Wide Area Talkgroups only • Neighbouring sites for each site are defined • Neighbouring sites are overlapping sites only and speed up automatic roaming • These parameters are configured in one repeater only (the “Master”) Site 1 Site 4 Site 5 Site 6 Site 3 Site 2

  48. Linked capacity Plus CONFIGURATION Repeater - Channel

  49. Linked capacity Plus CONFIGURATION Subscriber - Overview LCP Personalities Channel lists for each site Site list for all sites

  50. Linked capacity Plus CONFIGURATION Subscriber – Channel Lists for each site Defines channels at given site

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