TIA-136 DIGITAL EAC-2100 Manual ---DRAFT--- Order No.
HEALTH AND SAFETY WARNINGS Installer Warning: Any over-the-air radiated use of this product is intended to be used with either Roof Top (Building-mount) or Pole Mounted (Non-building-mount) Antennas. Antenna installation must conform within the following guidelines to meet FCC RF exposure limits.
Field Support If you need technical assistance with the EAC-2100 , contact MIKOM US, an Allen Telecom Company at one of the following telephone numbers: Extend-A-Cell HOTLINE: (800) 800-7465 or (804) 386-5340
LIMITED WARRANTY MIKOM, an ALLEN TELECOM COMPANY, ("ALLEN TELECOM") warrants, on the terms and conditions hereto set forth, all products manufactured by it to be free under normal use and service from defects in materials and workmanship for a period of one (1) year from the date of shipment, to the first consumer (the "Warranty Period").
1900 MHz HIGH POWER TRANSLATING CHANNEL SELECTIVE REPEATER for TIA/EIA-136 PCS Networks MIKOM’s EAC2100 repeater is designed to provide wide area coverage for TIA/EIA-136, 1900 MHz networks. High power and gain, achievable due to the intelligent F1 to F2 architecture, allow the EAC2100 to provide coverage extension normally available only from macro -cells. Isolation requirements are also minimized due to the translating nature of the repeater.
1900 MHz HIGH POWER TRANSLATING CHANNEL SELECTIVE REPEATER for TIA/EIA-136 PCS Networks General Specifications AC Power / Current Requirements 120/240 VAC 50/60 Hz (Auto-ranging) 10A @ 240 VAC DC Power / Current Requirements 19-30 VDC (nominal 24 VDC) Maximum 40A @ 27.6 VDC Standby 10A @ 27.
Contents Page List of Figures ....................................................................................................................... vi Quick Start Checklist ........................................................................................................... vii 1. Introduction ............................................................................................................1-1 1.1 1.2 2. About This Volume ................................................................
Contents Page 3. Installing the Hardware ........................................................................................3-1 3.1 3.2 3.3 3.4 3.5 4. Introduction.................................................................................................3-1 Mechanical Installation ...............................................................................3-4 3.2.1 Uncrating the Equipment ..............................................................3-4 3.2.2 Mounting the Cabinet...........
Contents Page 5. Installing the Remote Link....................................................................................5-1 5.1 5.2 5.3 5.4 5.5 6. Introduction.................................................................................................5-1 Setting Up Service .....................................................................................5-3 Programming the Mobile Radio .................................................................5-4 Checking Out the Mobile ............
Quick Start Checklist Programming Initial Parameters (See Sections 4, 5, and 6) 1. Type SSS . (Nothing should show DISABLED. If anything shows disabled, refer to Appendix A, Troubleshooting Guide.) 2. Type ALA . (There should be no alarms. If there are any OUT OF SERVICE or memory alarms, refer to Appendix A.) 3. Type SET and go into submenu C, System Parameters. 4. Enter submenu A and program the site ID. 5. Enter submenu B and program the donor and boosted DCCH channels.
Quick Start Checklist Programming Initial Parameters (Continued) 12. From the command entry level >, use the TIM command to set the date and time. 13. From the command entry level >, enter DCS=0, DCH=0, and ALA=0 to reset the report values. Completing the Installation 1. Connect the antennas. The unit is now operational! 2. Type SCS and make some calls. You will see your MIN displayed on call originations and answers. 3.
2. Preliminary Decisions 1. 1.1 Introduction About This Volume 1.1.1 Contents This volume, pertaining to the TIA/EIA-136 EAC-2100 , contains detailed procedures for installing and operating the EAC-2100. This volume has been divided into a Quick Start Checklist and 12 sections, described below. Introductory Information • Quick Start Checklist: Brief summary of installation and setup procedures. • Section 1.
2. Preliminary Decisions Terminology Figure 1-1 lists key terms used in this volume. Additional terms and acronyms are defined in the Glossary. Figure 1-1. Important Terms Used in This Manual Term Definition TDMA Time Division Multiple Access. Commonly used to refer to the TIA/EIA-136 digital cellular system. Boost To receive, amplify, and reradiate signals to fill in weak coverage areas.
2. Preliminary Decisions 1.2 About the TIA/EIA-136 EAC-2100 This section provides a brief overview of how the EAC-2100 operates. For a more detailed discussion, refer to Volume 3, Technical Information. 1.2.1 Use of Boosters Cellular telephone systems transmit signals in two directions between cell sites and subscriber telephones within the signal coverage area.
2. Preliminary Decisions The Forward Block Converter converts the 1930-1990 MHz signals from the donor cell site to the 870-890 MHz band. The 870-890 MHz block is fed to the 800 MHz TDMA RF modules for signal processing. The outputs of the 800 MHz modules are individually converted back to the 1930-1990 MHz band for subsequent transmission to the repeater coverage area.
2. Preliminary Decisions Model: Band: Channel Number Range: Forward Frequency Range: Reverse Frequency Range: Low Split A, D & B 1-1167 1930-1965 MHz 1850-1885 MHz High Split E, F, & C 833-1999 1955-1990 MHz 1875-1910 MHz Note that there is some overlap between the low split and high split bands. This is due to the characteristics of the duplexers. Boosting DCCH Channels. The EAC-2100 monitors the PCS donor DCCH channel to obtain system-specific information.
2. Preliminary Decisions 1.2.3 EAC-2100 Operation (Continued) Boosting to Multiple Donor Cells. To provide for situations in which in-progress calls may be linked to various neighboring cell sites (multi-donor operation), the system allows for entry of different donor DTC RF channel lists. For handing in subscribers, note that the donor antenna system at the EAC -2100 must be specifically designed for multiple donor operation.
2. Preliminary Decisions A. The reverse path signal level from the repeater is set such that it will trigger MAHO requests from the boosted subscribers, B. The donor site MAHO list must include all cell sites that are within overlapping coverage of the repeater, and C. Those adjacent cell sites that are within overlapping coverage with the repeater must have any secondary or backup verification feature (such as subscriber locate and verify before allowing handoff) disabled.
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2. Preliminary Decisions 2.1 Introduction Before the EAC-2100 can be installed, preliminary decisions must be made about the following: • • • • Use of Multi-hop configuration Booster site Antenna placement DCCH and DTC channels to be used As an installer, you may be involved in some or all of these decisions. The checklist in Figure 2 -1 provides a brief overview of preparations to be made prior to installing the EAC-2100. Figure 2-1. Pre-Installation Checklist Checklist q 1. 2. 2. 3. q 4. q 5. 6.
2. Preliminary Decisions 2.2 Use of Multi-Hop™ Configuration or Multi-Donor™ Units Multi-hop operation involves setting up two or more EAC-2100 units to operate together in a line. This configuration is described in greater detail in Section 7. Note that no additional equipment is required at neighboring cell sites along the multi-hop path. The MAHO feature of the TIA/EIA-136 system allows the cellular system to hand off a subscriber from the EAC-2100 multi-hop coverage area to any neighboring cell.
2. Preliminary Decisions 2.3.2 AC Mains Service The following AC mains service is requi red: • 120/240 VAC • single-phase • 20-amp minimum service 2.3.3 Space The EAC-2100 unit is approximately 22 in (W) x 23 in (D) x 36 in (H) (56 cm x 59 cm x 91 cm). If it is mounted on a wall bracket, allow an additional 3 in (8 cm) depth. For wall mounted applications, it is recommended the bottom of the cabinet should be at least 12 in (31 cm) above the ground or floor.
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2. Preliminary Decisions 2.3.4 Mounting Surface If the wall hanging bracket is used, make sure that the wall construction and the fastening hardware is adequate for handling at least the 210 lb (95 kg) of the EAC-2100. If the pedestal mount is to be used, make sure that the floor or concrete surface is adequate for handling approximately 60 pounds per square foot (300 kg per square meter). The pedestal has mounting holes to allow it to be bolted to the floor.
2. Preliminary Decisions 2.4.1 Type The antennas for the booster area should be chosen by the same criteria as used for a cell site. A typical installation might use the following antennas: D1: One high-gain directional antenna pointed toward the donor cell. M1 and M2: Two identical directional or omnidirectional antennas. F NOTE: Regardless of the type of antenna chosen, the M1 and M2 antennas must have identical gain and patterns, and be installed to cover the same area.
2. Preliminary Decisions 2.4.2 Placement Requirements. Antenna locations must meet the following requirements for minimum signal level, physical separation, and isolation. • Minimum Signal Level: The minimum signal level from any cell to be used as a donor must be -75 dBm at the D1 antenna connector on the EAC-2100. The minimum signal level from the donor cell must be at least -100 dBm at the data mobile antenna feed.
2. Preliminary Decisions 2.4.2 Placement (Continued) • Isolation: Isolation between the D1 and M1 and between the D1 and M2 antennas must be at least 75 dB. Isolation between the mobile antenna and all of the others must be at least 60 dB. Figure 2-3 shows a typical installation. M1 and M2 are placed highest on the tower to achieve the best coverage to the boosted area. D1 is placed below M1 and M2. At least 25 feet (8 m) of vertical separation is usually needed to meet the isolation requirement.
2. Preliminary Decisions 2.4.2 Placement (Continued) Figure 2-3.
2. Preliminary Decisions 2.4.3 Measuring Signal Level and Isolation To verify the correct placement and alignment of the antennas, it will be necessary to measure the signal level from the donor cell site (on the selected donor DCCH channel) and the isolation between the various antennas to ensure they meet the required levels.
2. Preliminary Decisions 2.4.3 Measuring Signal Level and Isolation (Continued) Signals from the cellular system will likely be stronger than the sweep signal received from the tracking generator, and difficulty may be experienced in measuring the actual isolation. Many spectrum analyzers have difficulty reading signals below -60 to -70 dBm when sweeping a broad bandwidth.
2. Preliminary Decisions 2.5 Selecting Channels Before beginning to install the hardware, identify the various channels on which the system will operate: • • • • • DCCH channel Boosted DCCH channel Donor DTC RF channels (primary and neighboring) Boosted DTC RF channels Directed retry channels Make note of all selected channels. They will be entered as system parameters during installation (Volume 1, Section 4).
2. Preliminary Decisions 2.5.2 Selecting a Boosted DCCH Channel The boosted DCCH channel (Selection 1-4, RF boards menu) is the control channel that will be used in the EAC-2100 coverage area.
2. Preliminary Decisions 2.5.4 Selecting the Directed Retry Channels The Directed Retry Channels parameter (selection C, Control Channels Menu) is probably the best option for most EAC-2100 installations. The parameter is a factory-set default and is one of four options available under selection J (DCCH Channel State During "All Channels Busy") of the Control Channels Menu.
2. Preliminary Decisions 2.5.5 Selecting Donor DTC Channels The donor and boosted DTC channels can be accessed from the DTC Channels Menu, shown here with all available selections. Refer to this menu for sections 2.5.5 and 2.5.6.
2. Preliminary Decisions 2.5.6 Selecting Donor DTC Channels (Continued) Identify the donor DTC RF channels with the following guidelines in mind: • All DTC RF channels of the primary donor cell will be entered in the donor DTC RF channel list. List 1 is recommended for the primary donor cell. Also recommended is that the DVCC assigned to the donor also be assigned to the EAC-2100. However, a different DVCC may be assigned to the EAC-2100 if desired.
2. Preliminary Decisions 2.5.7 Selecting Boosted DTC Channels (Continued) The following table illustrates proper channel separation: If there is only one donor cell with DTC channels... 1, 22, 43... Closest allowable boosted channel set 4, 25, 47... Channel sets not recommended 2, 23... 3, 24... Example: If there is only one donor cell and it uses DTC channels 1, 22, 43..., then the closest spaced channel set that could be used for boosted DTC channels would be 4, 25, 47.... The channel sets 2, 23..
3. Installing the Hardware 3.1 Introduction This section provides instructions for: • • • • Mechanical installation Connecting ac power Installing the antennas Connecting external alarms/controls (optional) The checklist in Figure 3-1 presents a brief overview of these installation procedures. For more detailed descriptions of the procedures, refer to Sections 3.2− 3.5.
3. Installing the Hardware Checklist q 1. EAC-2100 uncrated and contents checked. (Sec. 3.2.1) q 2. Holes drilled on the wall (for the wall bracket) or in the pad for the pedestal mount (if using expandable anchors). (Sec 3.2.2) q 3. Hanging bracket or the pedestal positioned and bolted in place (orient the pedestal for either front or rear RF cable entry, as required) q 4. EAC-2100 either hung on the wall bracket or placed on the pedestal, using appropriate lifting aids. (Sec. 3.2.2) q 5.
3. Installing the Hardware Figure 3-2.
3. Installing the Hardware 3.2 Mechanical Installation 3.2.1 Uncrating the Equipment The container includes these items: • The EAC-2100 unit • EAC-2100 manual Remove the shipping material from around the cabinet. Check the contents and take care that no hardware or manuals are misplaced. 3.2.2 Mounting the Cabinet The cabinet may be mounted on the wall either by using the wall bracket, or on a concrete or other pad using the pedestal mount.
3. Installing the Hardware 3.2.2.1 Mounting the Cabinet on the Pedestal 1. If using expandable anchors, determine the bolt locations (see Figure 3-4) and drill holes in the pad. 2. Place the pedestal on the pad where it will be installed. 3. Bolt the pedestal to the pad. Be sure to orient the pedestal correctly for RF cable entry through the ROX blocks. 4. Place the EAC-2100 on the pedestal, assemble and bolt the retaining bars to clamp it to the pedestal.
3. Installing the Hardware 3.3 Installing the Antennas Antennas should already have been mounted, as described in Section 2.4.2, in locations that meet the following requirements: • Minimum signal level from any donor cell: -75 dBm or greater at the D1 antenna connector. (See Section 2.4.2 for multi-hop and multi-donor unit variations.) • Physical separation: M1 and M2 antennas separated at least 10 feet (3 m) horizontally or 3 feet (1 m) vertically.
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3. Installing the Hardware 3.4 Connecting External Alarms/Controls (Optional) The EAC-2100 includes the following inputs and outputs, which may be used to monitor or control non-EAC-2100 equipment: • • • • 4 digital inputs 4 open collector digital outputs 4 analog inputs 1 +5 Vdc/100 mA source for powering external circuitry These inputs and outputs are located on the DB15 connector on the front of the controller module. The signals on the pins are controlled and monitored via the local or remote link.
3. Installing the Hardware 3.5 Connecting External Alarms/Control (Optional) (Continued) Figure 3-7. Electrical Specifications for Inputs and Outputs Pins Specifications Digital Inputs (pins 6,7, 8, 9): Load: Low: High: > 100 kΩ < 2 Vdc > 4 Vdc max. +28 Vdc Open Collector Outputs (pins 2, 3, 4, 5): Max. +15 Vdc, 20 mA Impedance 733 Ω Analog input (pins 10, 11, 12, 13): Load: Range: +5 Vdc source (pin 1): 1MΩ 0− 5 Vdc, 20 mV resolution +5 Vdc ±5%, 100 mA max.
3. Installing the Hardware 3.5 Connecting External Alarms/Control (Optional) (Continued) Figure 3-8.
4. Setting Up for Initial Operation 4.1 Introduction Most of the EAC-2100 operating parameters are under software control and can be changed from either a local terminal or a remote terminal. You will probably have to change some of these parameters to get the system running. After programming channels, you will also need to tune the transmitter combiner and adjust power levels.
4. Setting Up for Initial Operation Figure 4-1. Setup Checklist Checklist ¨ 1. ¨ ¨ Local terminal connected: (Sec. 4.2 and 4.4) a. Terminal powered up and set to 9600 baud, even parity, 7 data bits, 1 stop bit, full duplex, all capitals, send carriage return only, auto XON/XOFF and soft scroll disabled. b. EAC-2100 powered up and password entered. ¨ 2. System status (SSS) and alarm (ALA) report checked; no disabled and no alarms shown. (Sec. 4.6.1) ¨ 3. Site ID entered. (Sec. 4.6.2) ¨ 4.
4. Setting Up for Initial Operation 4.2 Powering Up the EAC-2100 One circuit breaker turns the AC power on and off to the EAC-2100. Figure 4-2.
4. Setting Up for Initial Operation 4.3 Connecting a Local Terminal The EAC-2100 communicates with a conventional ASCII, RS232 terminal. Connect the terminal as follows. 1. Using the cable provided in the tuck pack, connect the terminal to the 9-pin D-sub connector located on the front of the controller module. Figure 4-4.
4. Setting Up for Initial Operation 4.4 Connecting a Local Terminal (Continued) 2. Power up the terminal and set it to the following parameters: • 9600 baud • Even parity • 7 data bits, 1 stop bit • Full duplex (no local echo) If possible, also set the terminal to: • All capitals • Send carriage return only (no line feed) • Disable AUTO XON/XOFF and soft scroll If you are using a terminal emulation program, select TTY or VT100.
4. Setting Up for Initial Operation 4.4 Becoming Familiar with System Commands If you are new to EAC-2100 installation, you should use this section to gain familiarity with basic rules for entering commands, as well as key commands that will be used in setting up the system. If you are already familiar with the system, turn to Section 4.6. 4.4.1 Basic Commands Figure 4-5 lists definitions of symbols and abbreviations that are used in this section of the manual. Figure 4-5.
4. Setting Up for Initial Operation 4.5.1 Basic Commands (Continued) Entering Commands. Very few commands require entry of the data fields. After the initial command has been entered, the system usually prompts for data it needs. If a command does not depend on a certain field, any data entered in that field will be ignored. When entering commands: • Spaces may be added to separate the fields, after the first three letters have been entered. • Leading zeros may be omitted.
4. Setting Up for Initial Operation Figure 4-6. System Commands Command Meaning Purpose HEL HELp Gives a list of the primary commands. SET SETup Invokes a menu-driven entry mode used to inspect or change all EAC-2100 operating parameters. (To exit this command, type X and answer N .) SSS Show System Status Gives a one-page listing of current EAC-2100 parameter settings and conditions of monitored input parameters SCS* Show Call Status Shows current status of each board.
4. Setting Up for Initial Operation 4.5.1 Basic Commands (Continued) Ending a Session. A session can be ended in three ways: • LOC Command: This command should be used if the session involves only system monitoring or minor parameter changes. It ensures security, but lets alarms and call statistics continue to accumulate. • RES Command: This command should be used if extensive parameter changes have been made during a session.
4. Setting Up for Initial Operation 4.4.2 Using the SET Menus Configuring the EAC-2100 to fill in a coverage area in a specific cell ular system is easy, using either the local terminal or a remote terminal. From the command entry level (>), the SET command invokes the setup utility which displays a progression of menus. The menus provide a guided path to each EAC-2100 parameter. Figure 4-7 illustrates the paths to follow through the SET menus to reach each available parameter.
4. Setting Up for Initial Operation Figure 4-7.
4. Setting Up for Initial Operation 4.5 Setting Initial Parameters Before you can operate the EAC-2100, you must check system status and program the following: • • • • • • Site identification Donor DCCH channel Boosted DCCH channel Directed retry channels Donor DTC channels Boosted DTC channels You should already have the list of selected channels, as described in Section 2.4. You may also program alarms and thresholds, modem mobile MIN, mobile power step, and passwords at this time.
4. Setting Up for Initial Operation 4.5.2 Entering the Site ID 1. At the > prompt, type SET to display the SET Main Menu. Main Menu A RF Boards B Power Amplifiers C System Parameters D Alarms E Set Defaults 2. Type C to display the System Parameters Menu. System Parameters Menu A B C D Site ID ........................... Identification DCCH Channels ...........Donor DTC Channels ..............Donor Modem Control.............Passwords E Thresholds .....................
4. Setting Up for Initial Operation 4.5.3 Setting the Donor DCCH Channel 1. From the System Parameters Menu, type B to display the Control Channels Menu. DCCH Channels Menu A B C D E F Donor DCCH Channel ................................ ................................ ..................... 335 Boosted DCCH Channel ..................................................................................... 340 RF Board To Use For DCCH Channel ...............................................................
4. Setting Up for Initial Operation 4.5.6 Setting the Donor DTC Channels 1. From the System Parameters Menu, type C to display the DTC Channels Menu. DTC Channels Menu A B C Default Values DTC Channels DVCC List A ................................ ................................ .......... List DTC Channels DVCC List B................................ ................................ ........... List DTC Channels DVCC List C ................................ ................................ ..........
4. Setting Up for Initial Operation 4.6.6 Setting the Donor DTC Channels (Continued) 3. Enter channels in the list, as described below. A given channel may be entered in only one list. The system will support a maximum of 105 total channels in all four lists (A, B, C, and M). A. To add a channel, type A [channel number] . B. To add multiple channels, after the A enter multiple channel numbers separated by commas or spaces.
4. Setting Up for Initial Operation 4.5.7 Setting the Boosted DTC Channels The DTC Channels menu gives you access to boosted DTC channels 2− 4. Boosted channel 1 is normally used to boost the DCHH channel. Program channels 2− 4 as follows. 1. Type the channel number (2 to 4), followed by to access the desired corresponding Boosted DTC Channel parameter. 2. Enter the channel number, followed by . 3. To return to the DTC Channels Menu, type X . 4. Repeat steps 1− 3 for each boosted DTC channel.
4. Setting Up for Initial Operation 4.6.8 Programming Alarms and Thresholds (Continued) 2. Type D to set the fan activation point (the internal temperature that causes the cabinet heat exchanger to be turned on). The 60oC default setting is adequate for most installations. Lower the threshold to 50oC if the DCCH channel transmitter output is increased to its maximum (45W) output level. 3. Type H to access the +28 Volt Supply - Low Alarm Point parameter.
4. Setting Up for Initial Operation 4.6.8 Programming Alarms and Thresholds (Continued) 4. If external analog inputs are connected to the EAC-2100 external alarm/controls ports, type K to access the External Analog Inputs menu. External Analog Inputs Menu PA 1− 6 Cage: 1 Ext. Analog Input 1 Alarm State DISABLED; Input Currently 0.0 Volts 2 3 4 Ext. Analog Input 2 Alarm State Ext. Analog Input 3 Alarm State Ext. Analog Input 4 Alarm State DISABLED; Input Currently 0.
4. Setting Up for Initial Operation 4.6.8 Programming Alarms and Thresholds (Continued) 5. If external digital inputs are connected to the EAC-2100 external alarm/controls ports, type L to access the External Digital Inputs menu. External Digital Inputs Menu PA 1− 6 Cage: 1 Ext. Digital Input 1 Alarm State 2 Ext. Digital Input 2 Alarm State 3 Ext. Digital Input 3 Alarm State 4 Ext.
4. Setting Up for Initial Operation 4.6.8 Programming Alarms and Thresholds (Continued) Choose the number of the output(s) connected and program the desired state. You may specify: • • • • Low Low if critical alarm exists High High if critical alarm exists The "low/high if critical alarm exists" options are provided to allow for connection to external alarm signaling equipment. 7. Type N to review the Critical Alarms Menu, shown here with default values.
4. Setting Up for Initial Operation 4.6.8 Programming Alarms and Thresholds (Continued) Critical alarms will cause the EAC-2100 to automatically dial an alarm telephone number when the Auto-Dial feature is enabled. Log only alarms will be counted and displayed in the ALA screen, but will not cause the EAC-2100 to dial its programmed alarm number. The default values shown below will be adequate for most installations. To change an alarm, type the letter of that alarm and .
4. Setting Up for Initial Operation 4.5.9 Programming the Modem Mobile MIN, Mobile Power Step, and Passwords The assigned mobile identification number (MIN) of the mobile and the desired mobile power step should be loaded into the booster. This allows the booster to trap calls to and from the remote link to force operation on the donor DTC channels. By doing so, the remote link does not tie up one of the boosted DTC channels. Passwords may also be programmed now. 1.
4. Setting Up for Initial Operation 4.6 Setting Output Power 4.6.1 Setting Power Levels for Forward PAs 1− 4 1. With the system power OFF, connect power measuring equipment to the M1 antenna port for channels 1 and 2, and to the M2 antenna port for channels 3 and 4. Turn the power back on. Output power may be monitored using a through-line wattmeter (or a wattmeter with a built-in load) to monitor output power. 2. From the SET Main Menu, type B to display the Power Amplifiers Menu.
4. Setting Up for Initial Operation 4.7.1 Adjusting Power Levels for PAs 1− 4 (Continued) 5. Set the desired power level in dBm • If using a wattmeter, record the actual power reading (note, there may be small differences between the entered power level and the actual measured power level due to tolerances of the internal power reading circuitry and the external power meter). • The power reading at the M1 connector (for channels 1 & 2) or the M2 connector (for channels 3 & 4) should be +40.8 ± 1 dBm (12.
4. Setting Up for Initial Operation 4.6.2 Setting Reverse Path Output Power (If Necessary) The output power in the reverse direction (from booster to donor cell) is +20 dBm per channel. It is set at a much lower level than in the forward direction to prevent reuse interference with other cells that may be in the system. If the minimum received signal requirements are met for the forward direction, then by reciprocity +20 dBm per channel in the reverse direction is sufficient.
4. Setting Up for Initial Operation 4.6.4 Setting Time and Report Values The EAC-2100 keeps various statistics of calls handled by the booster and alarms that have been logged: • Running totals of the number and duration of calls handled per board can be displayed using the DCS command. • Incremental totals of certain call statistics can be displayed using the DCH command. • Alarms logged since the last system reset can be displayed using the ALA command.
5. Installing the Remote Link 5.1 Introduction The EAC-2100 normally will be equipped with an Ericsson T18D handset for remote link access. Use of the T18D for remote access will require that the local TIA-136 system have digital data service to the handset enabled. This is in addition to the normally available data originate feature available in TIA -136 systems. An alternative interface may be provided via the PCMCIA interface on the front of the controller card.
5. Installing the Remote Link 5.1 Introduction (Continued) The checklist in Figure 5-1 presents a brief overview of these procedures. For more detailed descriptions of the procedures, refer to Sections 5.2− 5.5. Figure 5-1. Remote Link Installation Checklist Checklist ¨ 1. Service set up with local supplier. (Sec. 5.2) ¨ 2. T18D handset programmed: (Sec. 5.3) 3. Handset checked out for proper operation: (Sec. 5.4) a. Powering up. b. Call originating. c. Answering. ¨ ¨ 5.2 ¨ ¨ ¨ 4.
5. Installing the Remote Link 5.3 Programming the Handset The handset is programmed via its keyboard. F NOTE: Procedure for programming the T18D to be provided later. Once programming and initial testing is complete, the handset should have its interface cable and RF cable connected, and then placed in the bottom of the cabinet. It should be secured via the clamp provided. 5.
5. Installing the Remote Link 5.5 Testing the Remote Link After the remote link has been installed and programmed, you should test its operation. The EAC-2100 should be able to answer calls placed from the remote link. It should also be able (if so programmed) to place calls to a predetermined number when certain alarm conditions exist. 5.5.1 EAC-2100 Answering The EAC-2100 constantly monitors and answers incoming calls even if it is being exercised via the local link.
5. Installing the Remote Link 5.5.2 EAC-2100 Originating The EAC-2100 constantly monitors and logs several alarm conditions. These conditions can be viewed using the ALA command. They are described in Volume 2, Operating Procedures. Each type of alarm can be defined as "critical" or "log only" using the SET command. If an alarm defined as critical occurs more than a predetermined number of times, a critical alarm is said to exist.
5. Installing the Remote Link 5.5.2 EAC-2100 Originating (Continued) Successful Call Sequence. When an auto-dial call is made, the following sequence occurs: 1. As the call is auto-dialed, the local console displays DIALING REMOTE LINK. ( from the local link at this point will abort the attempt.) 2. After the number is dialed, the EAC-2100 waits up to 90 seconds for a remote modem to answer and establish a connection. 3. Five seconds after connect, the EAC-2100 automatically lists the alarm report.
6. Optimizing Performance 6.1 Introduction After the EAC-2100 has been installed, the system must be checked out to determine if adjustments to the hand-in and handback thresholds are needed to ensure optimum performance. 6.2 Handoff from EAC back to donor – “Handback” When the subscriber is operating on the EAC 2100 DTC, the donor cell is not aware that the EAC is handling the call. Should the subscriber move towards the donor, the EAC itself must initiate the handoff.
5. Installing the Remote Link 6.3 Handoff from EAC to a cell adjacent to the donor Handoff from the EAC-2100 to adjacent cells happens almost automatically because of the fundamental role of the subscriber unit in the TDMA handoff process. When a call is operating on the EAC-2100, the MAHO reports from the subscriber are repeated back to the donor. The donor compares the RSSI reports from the adjacent cells to the “current RSSI”.
5. Installing the Remote Link Note that the RSSI that the portable subscriber would experience from the EAC is computed from the average RSSI at the EAC from the portable and the PA power settings. Once the signal conditions are met, the EAC will attempt a hand-in by using an available RF Module to send a handoff message to the subscriber.
5. Installing the Remote Link For calls operating on a donor DTC, hand-in will occur if the signal level from the donor is weaker than -100 dBm AND if the signal level from the EAC would be at least 5 dB better than from the donor. For calls operating on the EAC, handback to the donor will occur if the signal level from the donor is better than –100 dBm. Or, handback will occur if the signal level from the donor is at least 2 dB better than it is from the EAC.
5. Installing the Remote Link From the example settings, it is clear that it is possible to set the parameters such that a repeating hand-in / handback situation occurs. For operation, the sum of the minimum improvement levels should be at least 7 dB and the handback load shed level should be set at least 10 dB stronger than the handin load shed level. 6.8 Complete list of DTC related parameters Following is a complete list of the parameters that pertain to DTC operation.
5. Installing the Remote Link REVERSE PA POWER SET – DTC (Power Amplifiers Menu) These settings set the reverse power level that will be transmitted; the default settings of +20 dBm work in most installations. About the only time changes are needed is if the path to the donor is very good. In this case, the signal level from the EAC at the donor may be so high that it triggers power control actions in calls that are being handled by the EAC.
5. Installing the Remote Link DISTANCE FROM DONOR CELL (Control Channels Menu) This parameter is needed for DTC operation to establish the timing advance of the reverse transmissions. The allowable range is 0 to 96 kilometers. This value must be set accurately for proper DTC operation.
5. Installing the Remote Link HANDBACK- THESHOLD –DTC – MINIMUM IMPROVEMENT – (Thresholds and Power Control Menu) Default: 2 dB, Range: 0 (disabled) 1 -120 dB This parameter sets the level of improvement that the EAC calculates will occur before doing a hand-back on a call that is currently operating on one of the EAC DTC channels. See above for complete discussion of hand -in and hand-back for DTC.
5. Installing the Remote Link HAND-BACK MOBILE POWER LEVEL DTC – (Thresholds and Power Control Menu) Default: 2, Range: 0-16 This setting is the DMAC attenuation code that will be used for calls that are handed back to the donor. This should be set to the same as is being used for the donor cell. Level 2 represents a maximum size cell, assuming a predominance of subscriber units.
5. Installing the Remote Link MOBILE SYNC LOST – This indicates that sync was lost with the mobile after having had sync. This will occur if the subscriber unit travels away from the EAC coverage area towards an area that is not covered by the donor or any of its neighbors. DONOR SYNC LOST – This indicates that sync was lost with the donor after having had sync. UNSUCSSFUL SETUP WITH DONOR – This reason is listed if the initial IS136 call setup negotiation fails on the EAC to donor link.
5. Installing the Remote Link When entering the SSR command, each TDMA channel will have 3 RSSIs displayed. These represent the average RSSI in slots 1&4, 2&5 and 3&6. With TDMA channels, a * beside the RSSI indicates that the EAC will not attempt a hand-in on the channel / slot.
