ARCi Internet Broadband Fixed Wireless Internet Delivery System Physical Planning and Installation Manual AR1255 Integrated Headend Transceiver AR3155 Integrated Subscriber Transceiver March 2002 © 2001-2002 by Advanced Radio Cells Inc. Other product and company names mentioned herein may be the trademarks of their respective owners. This publication may include technical inaccuracies or typographical errors.
Advanced Radio Cells Inc. LIMITED WARRANTY. ARCi warrants to Buyer at the time of delivery that the equipment will be free from defects in material and workmanship under normal use and service. ARCi's sole obligation under these warranties is limited to replacing or repairing, at its option, at its factory, any equipment which is returned to ARCi, transportation, duties, and taxes prepaid, within twelve (12) months after delivery.
Advanced Radio Cells Inc. Broadband Fixed Wireless Internet Delivery System Physical Planning and Installation Manual Entire Contents Copyright 2001-2002 Advanced Radio Cells Inc. 910 Campisi Way, Suite 1F Campbell, CA 95008 USA Phone: 408-558-2760 888-863-8225 FAX: 408-371-7584 www.arcells.
A.
ARCi Internet Broadband Fixed Wireless Internet Delivery System Physical Planning and Installation Manual Table of Contents A. Table of Contents B. Introduction C. System Description D. Antenna and Frequency Planning E. Hub Installation Detail F. Subscriber Installation Detail G. Link Budget Paramaters H.
B.
Introduction The ARCi Internet system, deployed in conjunction with the Vyyo Broadband Wireless Access System, provides a complete end-to-end solution for ISPs and other fixed wireless operators seeking to expand their markets by offering wireless delivery of the Internet to their customers at performance levels that normally exceed DSL.
require six ARCi Hub Antennas arranged pointing outward spaced every 60 degrees. A system only looking up a narrow canyon from one end might require only one ARCi Hub Antenna. Cables are run from the antenna(s) into the building to the hub equipment room. The ARCi Subscriber Antenna is mounted outdoors at the subscriber location with line of sight to the hub antenna. A single cable is run to the modem and computer inside the subscriber location.
C.
Basic ARCi Internet – System Description Single Sector Hub Configuration ARCi Upstream > < Downstream < Telemetry* > DC Power > Hub * Telemetry support will be available in late 2002 Upconverter Rx DC Power Supply Hub Site UPS Wireless Hub (WMTS) 100 Mbps Ethernet Sw Network Manager PC Gateway (Probably Unix) Router (Windows/NT/2000) CSU/DSU Backhaul to ISP Figure C1 March 1, 2002 Page C2
Basic ARCi Internet – System Description Single Sector Hub Configuration The ARCi Internet hub location consists of one or more ARCi Hub Antennas mounted on the building roof or adjacent tower or monopole structure and its associated equipment located in the interior hub equipment room. Signal and power cables are run from the hub antenna(s) to the hub equipment room. See figure C1 on the preceding page.
Basic ARCi Internet – System Description Multi-Sector Hub Configuration The Multi-Sector configuration consists of two or more ARCi Hub antennas mounted on a common building roof or tower/monopole structure served by a single Wireless Hub (WMTS) located in an adjacent equipment room. As each Hub antenna covers a sector sixty degrees wide, six ARCi Hub antennas are required for complete 360-degree coverage.
Hub Interfaces Industry standard interfaces are employed between the various elements of the Hub system. Refer to Figure 2. Note that specific manufacturer and part numbers are given in the Installation Details section of this manual. See also the ARCi and Vyyo specifications sections of this manual. ARCi Hub Antenna Transmit and receive signal interfaces: 75 ohm type F female connectors Premium quad-shielded RG-6 coax cable recommended (e.g. Belden 1189A) Upstream signal frequency 6.
Upconverter 75 ohm type F female connectors Input signal frequency 44 MHz; level range +38 dBmV to +45 dBmV. Output signal frequency 477 through 577 MHz; maximum signal level +60 dBmV. 100 Mbps Ethernet Switch The Ethernet switch is the connection point for all TCP/IP data flow on the ARCi Internet side of the gateway (subnet). Subscriber traffic flows through the Gateway to the Internet via the Switch, as does Network Management traffic to and from the WMTS and the Internet.
If the network IP address is registered with its country’s Network Information Center then the gateway may be nothing more than a conventional router. If, on the other hand, the network IP address is one of the RFC1597 private addresses the gateway must be a proxy server of some sort. For example, the gateway may provide RFC1631 Network Address Translation services. Additional security measures such as firewalls may be added at the customer’s option.
Basic ARCi Internet – System Description Subscriber Configuration Upstream > DC Power > < Downstream ARCi Subscriber Modem DC Inserter Figure C2 The ARCi Internet subscriber installation consists of the ARCi subscriber integrated antenna and radio system mounted on the exterior of the subscriber facility and the wireless modem located inside the structure. A single power and signal cable is run between the integrated antenna and the modem location. See figure C2.
line of sight to the hub location. At the time of installation the antenna is carefully aimed to transmit and receive to/from the hub. The Subscriber Installation Details section provides mounting information and grounding recommendations for the integrated antenna. The ARCi Specifications section provides dimension, weight and mounting details. Inside the Subscriber Location, the wireless modem is connected to the PC by means of a standard Ethernet LAN cable.
D.
Antenna and Frequency Planning Antenna Patterns Horizontal The ARCi standard hub antenna is moderately directional, transmitting and receiving in a coverage pattern 60 degrees wide1. This means that the geographic coverage of the antenna is 30 degrees on each side of a line drawn straight out from the front of the antenna. Geography further to the sides or rear of the antenna receives increasingly less signal.
The frequencies displayed in Table D1 were chosen such that the resulting signal as received by the modem corresponds to a standard EIA CATV channel. This is because the modem, when not properly initialized or when it has lost track of the downstream signal, will “step” through the standard EIA channel list looking for a downstream signal. Alternatively, the modem may be optioned through its administrator interface to lock onto a specific downstream frequency, removing this requirement.
interference if both hub antennas are transmitting on the same frequency, even though the subscriber is receiving nominally the same signal from both hub antennas. The solution for this is to ensure that adjacent hub antennas are never transmitting on the same frequency. A minimum of two frequencies (and a maximum of six frequencies) is required for an omnidirectional system employing six – 60 degree hub antennas. See Figure D1, following.
Frequency Planning - Upstream Available Channels There are 3 available upstream channels4 when channel bandwidth of 3.2 MHz is employed5. See Table D2. When configuring the system the user must select the upper or lower carrier as well at the modem transmit frequency. The WMTS commands the modem to its upstream transmit frequency during the modem registration process. [The frequency of each upstream channel in a WMTS is set via a parameter of the regtree.txt file in the network management system.
Generally each upstream channel will terminate in a separate upstream port of the WMTS. WMTS upstream port cards are available in single and six input configurations. Thus, a typical six sector omnidirectional hub would utilize a single six input WMTS upstream card. See Figure D3, following. I G H Omnidirectional Hub Upstream Channel Example 6 sectors H G I Figure D3 This omnidirectional system might pair downstream channel A (Figure D1) with upstream channel G (Figure 5), etc.
E.
Hub Installation Detail Schematic Diagram – Outdoor Unit F-Male Connector & RG-6 (Installer Responsibility) DC & Telemetry Connectorized Cable (Included with Hub) March 1, 2002 Note: Rear weather cap must be in place and all screws secured for outdoor installation.
Hub Installation Detail Installation Detail – Outdoor Unit (ODU) Cable connections It will be more convenient to connect the ODU cables and close the headend rear weather cap prior to attaching the ODU to its mounting pipe. Refer to the Schematic Diagram – Outdoor Unit on the previous page. Remove the sixteen screws securing the rear weather cap to the anodized aluminum back plate of the antenna, taking care not to damage the gasket around the weather cap.
Mounting Mount the ARCi ODU on a vertical pipe with at least 44 vertical inches clear of unrelated hardware or other impediments. The ODU mounting brackets will accommodate pipe from 1.5 to 2.25 inches in outside diameter. Up-tilt or down-tilt is accomplished by means of adjusting the nuts on the 5/16 inch threaded bolts captive to the mounting assembly. See Figure E3 for details.
Ground Lead Figure E3 ODU Bracket Detail Ground the antenna to the metallic mounting structure (tower or monopole) or suitable rooftop ground point per local codes and installation practices. Normally #6 AWG or larger wire is utilized for this purpose. A ¼-20 ground bolt is provided on the bottom flange of the ODU assembly to attach the ground wire3. This is illustrated in Figure E3.
Cable Access Figure E4 Hub Antenna and Cable Installation March 1, 2002 Page E6
Hub Installation Detail Installation Detail – Outdoor Junction Box (OJB) The Multi-Sector configuration consists of two or more ARCi Hub antennas mounted on a common building roof or tower/monopole structure served by a single Wireless Hub (WMTS) located in an adjacent equipment room. Each hub requires a separate Upstream and Downstream IF cable, so a six sector (six ARCi Hub) installation would require 12 IF coaxial cables.
The upper barrier strip terminates the shielded/outdoor CAT 5 cable (black jacket) which is the least expensive multi pair cable we could find. One pair is connected between the ground block and the DC+ bus on the fuse block for power supply remote sensing, a second pair is reserved for the future telemetry application and the other two pairs are spares.
OJB Components The OJB pictured here is assembled from the following components: Device Vendor & Part Number Source Enclosure Hoffman A-1412CH Electric Supply Trade www.hoffmanonline.com Inner Panel Hoffman A14P12 Fuse Block Blue Sea Systems 5015 Ground Bus Blue Sea Systems 2301 West Marine Retail www.bluesea.
Hub Installation Detail + - Lightning Protectors < Ground > DC Power > < DC Voltage Sense** < Telemetry* > Transmit > < Receive Schematic Diagram – Indoor Equipment Ground Bus - Bond to Equipment Rack & Site Common Ground per NEC. (Installer Responsibility) DC Power Supply - Output + Output Remote V. Sense 12 dB Tap 12 dB Tap Telemetry To/From Network Manager PC Upconverter 10 dB pad > * Telemetry will be available in late 2002.
Hub Installation Detail Installation Detail – Indoor Equipment Grounding Proper grounding is critical to the safety, performance and the life of the equipment installed at the hub. Refer to the Schematic Diagram – Indoor Equipment on the preceding page. ARCi recommends that the installer follow the general grounding practices employed in cellular and PCS hub sites. ARCi recommends the following Lightning Protectors from PolyPhaser Corp. (www.polyphaser.com).
In a single sector installation a small variable voltage linear DC power supply capable of supplying at least 1000 mA is employed. ARCi has successfully tested the following power supply in the single sector configuration: Agilent E3610A The voltage (IR) drop of the power cable is calculated and the output of the DC supply is set appropriately. For Example: If a single ARCi hub is connected with a 100 ft.
The upconverter is adjusted to provide the downstream signal at the center frequency appropriate for the ARCi hub transmitter to create the desired RF carrier frequency. See Table D1 in the Antenna and Frequency Planning section of this manual for more information. The output of the upconverter is connected with RG-6 cables through a 12 dB tap, and thence through the lightning protector to the cable to the ARCi hub antenna.
System Level Setting Notes General The head end and subscriber transmitters are designed for linear operation at the maximum output power allowed for compliant operation under the FCC part 15 regulations. In both the head end and the subscriber units the input power level to the ARCi radios determines that of the output. There is no gain adjustment available to the user.
The most accurate method of setting the actual output power level is to attach an RF power meter capable of measuring up to 6 GHz to the output of the hub transmitter through a 15 inch long RG142B/U SMA-SMA cable and then adjusting the IF level until the power indicated on the meter is +15 dBm. However, ARCi does not recommend that this adjustment be made in the field unless under the direct instruction of the ARCi factory.
ARCi Hub Power / Telemetry Cable Convention Switchcraft EN3 Belden 3124A Downlead EN3/Internal Headers Twisted 9744 Pin [ Black [ [ Red 1 DC Ground* Black Black 2 DC + 8.5 VDC* Red Red 3 Telemetry + White Yellow 6 Telemetry – Green Green 4&5 [ White [ [ Black (reserved) * ARCi lab standard Internal Headers AR105 Rx Cord Connector Rear View ● n.c. ● +8 Vdc ● ground ● data - ● data + (equals) Panel Connector front View to SMA 3 1 2 4 AR150 Tx 6 ● n.c.
F.
Subscriber Installation Detail Schematic Diagram Subscriber Unit Rear View NOTE: Coaxial cable length between DC Inserter & Outdoor Unit must be between 50 and 200 feet. Building Entrance F-Male connector with waterproofing boot and seal F-Male connector for interior installation 10 - 20 dB pad may be required < 1 mile from hub Grounding Device NOTE: 1. Dual shield RG-6 coaxial cable (Belden 9116 or equiv.) & F-Male connectors are supplied by installer. 2. Items labeled (inc.
Subscriber Installation Detail Installation Detail – Subscriber Outdoor Unit Mounting Mount the ARCi subscriber outdoor unit (ODU) on a vertical pipe with at least 12 inches clear of any hardware or other impediments. The mounting brackets will accommodate pipe diameter from 1.25 to 2 inches. Up-tilt or down-tilt is accomplished by loosening the cap screws on the sides of the mounting assembly. See Figures F1 and F2.
Cable Connection and Grounding Attach the single RG-6 coaxial cable to the F connector on the rear of the subscriber ODU. Waterproof the connection using a suitable method such as taping with Scotch #88. Be sure to leave sufficient slack to allow the antenna to be oriented and that the cable runs directly downward from the connector to avoid water running down the cable and into the F connection.
DC Power Supply and Inserter Inside the building, route the RG-6 from the building entrance point to the modem location. Attach an F connector and connect it to the “TO AMPLIFIER” or “TO ANTENNA” F female connector on the power inserter.
Note for Close-in Installations The Subscriber Installation Schematic Diagram (Page F2) shows a 10 or 20 dB pad (attenuator) installed between the power inserter and the modem. Small pads of many values are available with F connectors to screw in line with the coaxial cable connection, and they may be cascaded to sum their attenuation. At the time of system set-up it may be determined that such pads are required in installations less than a mile from the base station site to reduce excess signal.
G.
ARCi Link Budget Parameters Upstream minimum Vyyo WMU output spec (dBmV) +8 IFL coax loss - Belden 9116 (calculate; length limited by downstream) ARCi CPE IF input (dBmV) +18 +58 ARCi CPE RF output (dBm) -27 +13 typical maximum +58 ARCi CPE Tx antenna gain (dBi) 11 Path (calculate) ARCi Hub Rx antenna gain (dBi) 16 ARCi Hub RF input level (dBm) -95 -85 ARCi Hub RF output level (dBm) -48 -38 ARCi Hub RF output level (dBmV) 0 +10 IFL coax loss – Belden 1189A (calculate; length li
Readers of this Manual are Encouraged To Forward Their Corrections and Comments 408-558-2763 (direct) 408-371-6934 (fax) rmelzig@arcells.com Revision: March 1, 2002 H. Reader Feedback To: Rick Melzig Advanced Radio Cells Inc.
