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®
TRACER 2 x E1
User’s Manual
TRACER 2 x E1 User’s Manual, 2001 61280004L2-1C
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61280004L2-1C TRACER 2 x E1 User’s Manual, 2001
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RADIO FREQUENCY INTERFACE STATEMENT This equipment has been tested and found to comply with the limits for an intentional radiator, pursuant to Part 15, Subpart C of the FCC Rules. This equipment generates, uses, and can radiate radio frequency energy. If not installed and used in accordance with the instructions, it may cause interference to radio communications. The limits are designed to provide reasonable protection against such interference in a residential situation. However, there is
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61280004L2-1C Radio Frequency Interference Statement • The installed antenna must not be located in a manner that allows exposure of the general population to the direct beam path of the antenna at a distance less than 15 feet (4.6 meters). Installation on towers, masts, or rooftops not accessible to the general population is recommended; or • Mount the antenna in a manner that prevents any personnel from entering the area within 15 feet (4.6 meters) from the front of the antenna. • It is recomm
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61280004L2-1C Table of Contents Page Section 1. Tracer Description Introduction .................................................................................................................................... 1 Applications .................................................................................................................................... 1 Spread Spectrum .........................................................................................................................
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61280004L2-1C Table of Contents E1 Interfaces ..................................................................................................................... 13 Link Planning ............................................................................................................................... 14 Antenna Feedline Loss ..................................................................................................... 15 Antenna Gain ................................................
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61280004L2-1C Table of Contents Main Menu Screen...................................................................................................... 27 E1 Status / Configuration / Loopback Screen ............................................................ 28 Link Performance History .......................................................................................... 29 E1A Statistics Page....................................................................................................
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61280004L2-1C Table of Contents Carrier Sync Status or E1 Mux Sync Status ............................................................... 41 RFC Link Up Status ................................................................................................... 42 ES Values in E1A or E1B Performance History Menu .............................................. 42 SES Values in E1A or E1B Performance History Menu............................................ 43 Section 5. Specifications Transmitter ...
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61280004L2-1C Table of Contents Illustrations Figure 1-1. Typical Application..................................................................................................1 Figure 1-2. Bandwidth Division ................................................................................................. 2 Figure 1-3. BBP .......................................................................................................................... 3 Figure 1-4. BBP Rear Panel ........................
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61280004L2-1C Table of Contents viii TRACER 2 x E1 User’s Manual
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SECTION 1 TRACER DESCRIPTION INTRODUCTION The Dual E1 version of TRACER provides two, individual E1 transports via a 2.4 GHz or 5.8 GHz, direct sequence, spread spectrum microwave link. The transmitter output power is 20 dBm maximum while the receiver sensitivity is -89 dBm @ 2.4 GHz and -87 dBm @ 5.8 GHz. System performance is determined, in part, by the engineering of the microwave link. Each TRACER radio is comprised of two components – the baseband processor and the radio frequency conve
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61280004L2-1C Section 1 TRACER Description Direct Sequence A direct sequence transmitter spreads the signal by mixing the data with the output of a pseudorandom number generator which changes state at a rate higher than the data rate. This rate is called the “chipping” rate. The TRACER chipping rate is twelve times the data rate. Coding Many different pseudorandom sequences exist. The sequences are called pseudorandom because, although they appear noise-like, they are determinant and repeat
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61280004L2-1C Section 1 TRACER Description E1 Interfaces The E1 interfaces conform to the ITU G.703 and G.704 electrical and signaling interface recommendations. Two interfacing configurations are allowed - two pair of BNC coaxial connectors or two 15-pin sub-D connectors and RJ48 connectors. The coaxial connection provides a 75Ω unbalanced connection. The shield of the TX coaxial connection is attached to earth ground. A strap is provided to optionally connect the shield of the RX coaxial c
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61280004L2-1C Section 1 TRACER Description A block diagram of the BBP is shown in Figure 1-5. RS-232 UART µ C Baseband Processor Board DSP E1 A E1 Spread Data Viterbi Spectrum Multiplexer Encoder/ Data Decoder Pump E1 B E1 Fc = 140 MHz IF Filter Σ 90 Fc = 70 MHz 90 IF Interface Board 21-56 VDC Figure 1-5. BBP Block Diagram VT100 RS-232 Interface An RS-232 interface is provided via a 25-pin D connector for attaching a VT100 compatible terminal. The active signals used on this interface are l
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61280004L2-1C Section 1 TRACER Description • Loss of signal • Code violation • CRC error • Framing error • Remote alarm • UA1 A seven-day error history of the E1 interfaces and radio link is also provided. Fifteen-minute histories are provided for the most recent 24 hours of operation. The status of the microwave link can also be monitored from the management system. The transmitter power setting as well as an indication of the received microwave signal level are provided. Alarm Contacts
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7 6 5 4 3 61280004L2-1C Section 1 TRACER Description TRACER E1A E1B FREQ SYSTEM ALM ALM TEST LBK LBK PLAN A RF LOW CV/CRC CV/CRC POWER PLAN B LINK DOWN LOS/OOF LOS/OOF Figure 1-6. BBP Front Panel with Door Closed 1234 TEST ALM LBK ALM LBK GND L RSSI +5 +12 A TST RF LOW HDB3 HDB3 RESET LBKA LBKB TEST CAS CAS UP CCS CCS DOWN PWR LOS CV LOS CV B FAIL LINK AMI AMI OOF CRC OOF CRC CODE TX PWR CLK Q RF -5 -12 PWR E1A E1B PLAN REMOTE ERROR Figure 1-7. BBP Front Panel with Door Open As a rule, a gree
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61280004L2-1C Section 1 TRACER Description The LEDs that indicate error conditions in the spread spectrum data pump and RFC are listed below. All of these LEDs are visible through the front panel. Any one of these LEDs indicates an error condition that precludes system operation. Link Down .............. Red if the RF link is not operational. E1 interfaces will transmit UA1 on the affected E1 to indicate an error. RF Low ................... Red if the received RF carrier level is below -80 dBm.
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61280004L2-1C Section 1 TRACER Description Built-In Tests The TRACER has several features to aid in site setup and later debugging. These diagnostics include E1 loopbacks and a link test with BERT (Bit Error Rate Test) data. A link test is performed by pressing the test button. The remote unit will then send a pseudorandom data pattern, and the local end will compute a BER. After the conclusion of the test, the remote end will automatically be instructed to terminate the pattern generation. If
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61280004L2-1C Section 1 TRACER Description Three SMA connectors, located on the RFC module, provide RF and IF connection points. A test point is provided for monitoring the received signal strength indicator (RSSI). The voltage (relative to the GND test point) present on this test point represents the level of the received signal. This signal is used to align the antenna when installing the system and to verify the link is performing as designed. NOTE The voltage level present at the RSSI test
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WARNING Mounting Clearances Housing Assembly and Guide for Mounting Bracket Holes 61280004L2-1C Section 1 TRACER Description Eye Level View Up Angle View Figure 1-11. Mastmount RFC Housing Antenna Selection TRACER is intended to be coupled with an antenna that is directional (thus providing signal gain). There are several reasons for this requirement: • TRACER operates in point-to-point applications so omnidirectional antennas cannot be used. • The low power transmitter is intended to be use
