5 Connectivity This section describes how to connect multiple LGCell systems and how to connect specific microcellular base stations (MBSs) to the LGCell. Please refer to the tables in Section 2, LGCell Equipment, for important information on system gains and maximum RF power per carrier. Contents Connectivity Connecting Multiple LGCell Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Connecting two LGCells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Connectivity
Connecting Multiple LGCell Systems Connecting multiple LGCell systems increases the total number of Remote Antenna Units (RAUs). Multiple LGCells can be stacked to increase the total number of RAUs through the use of power combiner/dividers. LGC Wireless provides Integration Modules which may be used with the LGCell to efficiently centralize additional radio capacity inside a facility. These Modules provide the connection between the radios for the facility and the LGCell system.
The following are procedures for connecting two LGCells. For Dual Band installations, connect a power combiner/divider for each Main Hub band. 1 Connect Cables From LGCells to Hybrid Power Combiner/Divider Connect the DUPLEX, FORWARD, or REVERSE connector of one of the Main Hubs to an input/output port on the power combiner/divider using an N-male to Nmale coaxial cable jumper.
6 Common Problems, Troubleshooting, and Frequently Asked Questions This section provides procedures for troubleshooting LGCell problems based on the front panel diagnostic LEDs. LGCell has no user-serviceable parts. Faulty or failed units are fully replaceable through LGC Wireless. U.S. customers, please contact us at 1-800-530-9960. International customers, please contact us at +1-408-487-2400.
-2 Common Problems, Troubleshooting, and Frequently Asked Questions
Common Problems and Troubleshooting The LGCell has three sources of potential problems: • Malfunction of one or more LGCell component • Faulty cabling/connector • Antenna, base station, or repeater problem By far, most problems discovered have to do with faulty cabling. All CAT 5 cable should be tested to TIA/EIA 568-A specifications. The diagnostic procedures are based on information in the Diagnostic Table on page 9. The table lists all LEDs and indicates what to do under certain circumstances.
LED Indicator Description The LGCell Main Hub, Expansion Hubs, and RAUs have front panel LEDs. The LEDs provide diagnostic information and operational status of each unit. Together they provide an efficient diagnostic display system, which help technicians find the fault if there is a malfunction. Main Hub LEDs There are two sets of LEDs on the Main Hub front panel: •Main Hub MMF Ports •Main Hub Functionality LEDs • Main Hub MMF Ports LEDs Provides status on each of the Main Hub’s four MMF ports.
Expansion Hub LEDs There are two sets of LEDs on the front panel • Expansion Hub UTP/STP Ports • Expansion Hub Functionality • UTP/STP Ports LEDs Provides status on each of the Expansion Hub’s four UTP/STP ports. LED LINK STATUS SYNC • Color Indication Green Indicates good connection to the RAU. Red Connection problem between Expansion Hub and the RAU plugged into that port. Green Indicates RAU connected to it is operating properly. Red Problem with the RAU plugged into that port.
RAU LEDs RAUs have two LEDs: •Sync •Power LED Color Indication SYNC Red Antenna lost sync and has shut down RF power. POWER Green Antenna is plugged in and the connected Expansion Hub is on. Troubleshooting Guidelines The LGCell Main Hub, Expansion Hub, and RAUs have front-panel indicator LEDs that provide diagnostic information and the operational status of each unit. Together they provide an efficient diagnostic display system for maintenance and fault location if a malfunction ever exists.
Problem/Symptoms Check No downlink signal output when all diagnostic LEDs are green. Make sure that there is a reasonable amount of power at the input of the Main Hub. Measure the output power of the coaxial cable using a power meter. The LGCell is intended for a different frequency band. Verify that your system corresponds to the desired frequency spectrum (for example, 800 MHz, 1800 MHz, or 1900 MHz). Check the part number of each unit. The LGCell is factory set for different bands of operation.
Diagnostic Procedures Use the following table when diagnosing system problems. While troubleshooting, you can copy the blank table on page 12 and use it to record the LED colors on the Main Hub, the particular Expansion Hub indicating a fault, and the RAUs connected to it. This is necessary because the Main Hub, Expansion Hubs and RAUs might be geographically distributed. To determine where the fault might be 1 2 6-8 Go to the Main Hub and record the LEDs.
Diagnostic Table Remote Alarm See Note Contacts Visual Alarm LEDs RAU Expansion Hub PORT LEDS POWER SYNC LINK SYNC STATUS Main Hub HUB LEDS PORT LEDS DB-9 Connector HUB LEDS SYNC POWER LINK SYNC STATUS SYNC POWER MAJOR ERROR ALARM LATCH CONTACT CONTACT Green Green Green Green Green Green Green Green Green Green Short Short 1 Off Off Off Off Off Off Red Red Green Green Open Open 2 Off Off Green Red Green Green Green Red Green Green Open* Open 3 Off Off Re
4 Power is not being delivered to the RAU. • Switch the UTP cable to a different Expansion Hub port to see if the same problem occurs. If the LEDs on the new port are both green, there is a problem with the Expansion Hub. If the problem persists, there is a problem with either the RAU or the UTP/ STP cable. • Check that the UTP/STP cable has been properly crimped and passes a standard TIA/EIA 568-A CAT 5 compliance test. If the cable passes the CAT 5 test, replace the RAU.
• If the problem persists, replace the Main Hub. • If the problem persists, replace the Expansion Hub. 8 The Main Hub is off. Make sure the power cord is connected to a live AC power jack and that the Main Hub power switch is in the 1 position. 9 Main Hub is not properly generating the synchronization signal. Turn off the Main Hub and turn it back on. If the sync LED stays off, the Main Hub might require replacement.
Diagnostic Table Use the following blank table to record LEDs as you troubleshoot Remote Alarm See Note Contacts Visual Alarm LEDs RAU Expansion Hub PORT LEDS POWER SYNC 6-12 LINK SYNC STATUS Main Hub HUB LEDS PORT LEDS SYNC POWER LINK SYNC STATUS DB-9 Connector HUB LEDS SYNC POWER MAJOR ALARM ERROR LATCH CONTACTS CONTACT Common Problems, Troubleshooting, and Frequently Asked Questions
Frequently Asked Questions The following list provides answers to some frequently asked questions about LGCell: 1 What is the LGCell Distributed Antenna System? The LGCell Distributed Antenna System (DAS) contains multiple low-power radiating elements that are deployed around indoor facilities to improve coverage and capacity.
6 Can the LGCell system share the same UTP Category 5 Cable with the Ethernet network? No. The LGCell system can use the existing unused cabling inside the building; however, you cannot use the same cable to connect an RAU and a computer. 7 What is the minimum power input to the Main Hub? The coverage area of an RAU is directly related to the input down link power at the Main Hub. Therefore, an input power that generates an output power of 0dBm per channel optimizes the coverage area of an RAU.
