Manuale UtenteSommarioFCC ID AB6NT1900FRM1NORTEL CDMA METRO CELL2(MetroDE -- MetroRE)2800/1900 MHz2Outdoor Cell Site Requirements2Issue 0.022Document: NORTEL CDMA Metro Cell (MetroDE -- MetroRE)2Cell Site Requirements2February, 20012NORTEL Wireless Networks2CDMA BTS Radio Development2BTS Radio Systems 2M412Security Warning:2The information contained in this document is the property of Northern Telecom2Ltd. The holder of this document shall keep all information contained herein2confidential and shall protect the same in whole or in part from disclosure and2dissemination to all third parties.2Table of Contents31.0 Executive Summary5The CDMA Outdoor Metro Cell is a new product development for Nortel’s wireless markets in North A...52.0 Introduction6This document outlines the cell site engineering requirements for the CDMA MCBTS 1900 System. Its...6Specifications in the Product Specification |agreement (PSA) shall take precedence over informati...6The MCBTS cell site requirements fall into six main categories:6The mechanical requirements cover the physical characteristics (weight, size), the mounting requi...6The MCBTS (Metrocell) will be deployed in a number of environments potentially both indoors and o...63.0 Environmental Requirements7The external environmental operating condition requirements are described in this section. Table ...7Table 3.1: MCBTS Thermal rating74.0 Mechanical Requirements84.1 Physical Specifications8The MCBTS is comprised of a digital enclosure (DE) and radio frequency modules (FRM). The digital...84.2 Digital Enclosure8The DE is the main structural component in the MCBTS. The digital enclosure will house the rectif...8The preliminary outside dimensions for the DE are illustrated below. These dimensions refer to th...8The dimensions are:8The DE with no shelves will weigh an estimated 190 lbs.84.3 Digital Enclosure Interface8The Digital Enclosure Interface (DEI) for the MCBTS enclosure assembly provides entrance of the A...8The dimensions are:8The weight of the empty DEI is estimated to be 225 lbs. The loaded module weight after integratio...84.4 External Battery Cabinet9The MCBTS external battery cabinet (EBC) is an optional stand alone enclosure that provides addit...9The EBC utilizes the DE as its external enclosure for environmental protection. four lifting eyes...94.4.1 FRM12The FRM is illustrated in Figure xyz.12Each FRM consists of the following main components: duplexer pre-selector module (DPM) or triplex...12.124.5 General Cabinet Anchoring12The DE is designed to be hoisted by a crane. Four mounting points are provided on the top of the ...124.6 Pad mounting12The MCBTS shall be mounted on a concrete slab124.7 Rubber Isolation Pad12The DE shall be mounted on a rubber pad.125.0 AC Power Requirements135.1 Power Specifications13Commercial AC power will be supplied to the DE as a single/split-phase, 120/240 Vac nominal, or 1...13The DE ac power input requirements are as follows:13• Nominal Input Voltage: 240/120 Vac, single, split phase, 50/60 Hz13• Input Voltage Range: 178 to 264 Vac13• Input Frequency: 47 - 63 Hz13• Power factor: greater than 90% at nominal line voltage and frequency13• Input current rating 70A, 2-pole circuit breaker135.2 AC Power Connection13All external AC power enters the system via the AC panel in the DEI. Primary power is by13connection to the AC utility. A four wire (L1, L2, Neutral, and ground), nominal 240/120V (or 208...13Auxiliary AC power access is via the external AC generator receptacle connector.13.136.0 RF Overlay Requirements14The Metro Cell has several overlay options14Basic installation configuration (single channel)14Simple overlay or mini configuration14The Metro Cell can accommodate 1900 MHz FRM’s, 800 MHz FRM’s, or combinations of both.14The FRM is illustrated in Figure 16. Each FRM consists of the following main14components: duplexer pre-selector module (DPM) or triplexer module, transmit receive14module (TRM), power amplifier module (PAM) and fan/plenum assembly. The alarm14indicator module (AIM) is located within the fan unit housing. The PAM, TRM, and fan14unit have the same mechanical dimensions for both 800 MHz and 1900 MHz14configurations. The 800 MHz DPM is taller than the 1900 MHz DPM.14The minimum requirement (1 carrier) is 2 antennas per sector, one for the main path (Tx and one d...14Table 6.1:146.1 Cable Connections14The optical link cable, SFRM DC power cable and the GPS antenna cable have a provisionable length...14The quantity of inter-DFRM cables required depends upon the application. In a single carrier syst...14Two sample configurations will be considered for illustrative purposes. These are:14i) a basic system with no redundancy;15ii) a premium system with all redundancy157.0 GPS Receiver16Timing and frequency reference information provided by the GPS receiver is critical to the proper...16The antenna should be installed to provide the best view of the entire sky. A complete view of th...16The maximum distance between Metrocell and GPS antenna is set by the maximum allowable cable loss...16Connections and Cabling178.0 Connections and Cabling218.1 FRM Power Connections and Cables21DC power is conducted to individual FRMs via two conductor (-48V, BR) shielded (ground) cables, o...21The specifications for these external FRM dc cables are as follows:21• less than 3000 feet, use 2 conductor #8 AWG shielded cable21• Between 300 and 600 feet, use 2 conductor #621• Allowed cable voltage drop: 6 Vdc maximum (-48V and Rtn combined)21• Cable terminations: two-hole lugs at the DEI BRR plate, twist-lock type21connector at FRM (to mate with the PEM)21• Shield termination: grounded at both the FRM and DEI ends, and at the base of21the tower21The FRM DC cable is sized for voltage drop, not ampacity21The optical link enters the FRM via the electro-optic module (EOM)218.2 FRM Interconnect21Table 8.1 next shows the FRM external interconnect single carrier configuration.21Table 8.1: FRM Interconnect228.3 Fiber22The optical link to the FRM contains 4 fibers per link. two receive and transmit pairs for redund...22Fiber interconnect and rearrangement features are required to interconnect the FRMs to the Digita...22The FRM has an EOM which depends upon the length of the fiber run from the DE to the FRM229.0 T1/E1 Connections23The CM module has up to 6T1 interfaces connected through the backplane. The cable will probably b...23The Metro Cell can be connected to the BSC using 1 to 6 T1/E1 links. These T1/E1 links are distri...23There are two ways of connecting T1/E1 to the Metro Cell. The T1/E1 cables can be23directly brought into the DEI or they can be connected to a RJ48H connector which23interfaces with the DEI. The RJ48H connector cable NTGS0106 is provisionable. In the23DEI T1/E1 connections are done on the middle and lower blocks among the three23Telephone/Data Line Protection blocks as shown in Figure 87. The RJ48H connector is23shown in Figure 88 and the pinout is shown in Table 30.23The number of T1/E1s that need to be connected to the Metro Cell depends on the call23carrying capacity of the T1/E1s and the number of calls that a Metro Cell has to make.23The number of T1/E1 that need to be provisioned for a Metro Cell can be determined23from Ref [10].23The two modes of operation of Metro Cell are regular (or non-split) mode or split mode.23In the regular mode only one DCG is active, the other DCG may not be provisioned or is23a redundant DCG. In the split mode both DCGs are provisioned and are active. Each23DCG in the split mode is a logical BTS. The T1/E1 connections of the Metro Cell in the23regular and split mode are done as shown in Table 27.23The T1/E1 lines are connected to one of the two BTSI cards in the control module (CM)23Table 27: T1/E1 Connections of Metro Cell without Daisy Chaining24The T1/E1 lines are connected to one of the two BTSI cards in the control module (CM)24which forms part of the DCG. The connections are controlled by relays and are exclusive24to one DCG. Therefore if T1/E1 #1 is connected to the first DCG then the same lines24cannot be connected to the other DCG. This is true in regular as well as split mode. In24regular mode since only one DCG is active, therefore, all the T1/E1s are connected to24the active DCG. When the redundant DCG takes over then the connections are switched24to it by closing the relays on this new active DCG and opening them on the previously24active DCG. The middle column of Table 27 shows how the T1/E1 connections are done24for the active DCG in regular mode. In the split mode each DCG is active and is part of24the logical BTS. Therefore, each DCG has its own independent T1/E1 connections. The24right column of Table 27 shows how the T1/E1 connections are done for the two logical24BTSs in the split mode. It is clear from [1] that a single DCG, supporting a maximum of24two carriers, does not need more than 3 T1/E1 connections. So, the connections shown24in Table are reasonable and will provide for a redundant T1/E1 link per logical BTS in24most cases (keeping in mind the number of T1/E1 links needed for 2 carriers as24mentioned in [10]).24The Metro Cell can be configured for a shorthaul link or a longhaul link. In case of a24shorthaul configuration the Metro Cell should be within 655ft of the last repeater while for24a longhaul link the Metro Cell should be within 6000ft of the last repeater using 22 gauge24unshielded twisted pair cable i.e. 100 ohm 22 gauge cable. The shorthaul and longhaul24link is configured using software. The distance of the Metro Cell from the last repeaterhas to ma...2410.0 Grounding2610.1 BTS grounding Architecture26The FRM is grounded to its mounting structure, whether a tower, wall, building or pole. for outdo...26The FRM mounting structure and BTS cabinets both connect to the site ground ring. #2 AWG cables l...2610.2 Antenna Grounding26Each GPS antenna will be grounded at the antenna mast and again at the cable entry point (coax ca...2610.3 Radio rack Grounding26The common ground point in the RE is the subframe. A #2 AWG cable will connect the26subframe to the main ground point in the DEI in the side-by-side configuration. When the26RE is installed remotely from the DEI/DE the ground cable will connect the subframe to26the site ground in that area. Attachment shall be made with two hole compression lugs.26The shield of the DC power cable connecting the main electronics cabinet to the FRM26shall be grounded at both the FRM end and the main enclosure end (main ground plate)26.26Provision one NTGS0161 main site ground cable for the DEI/DE and one for every RE.2610.4 Site Ground Ring26A peripheral grounding ring, usually buried around the site perimeter, or routed along the outer ...26equipotential reference to minimize differential voltages during lightning surges. It26consists of a #2 AWG (or larger) uninsulated, tinned copper conductor. Connections are26made to it using C-tap clamps.26The ground ring makes earth contact through ground electrodes, typically copper-clad27stakes 3m (10 ft.) long, driven into the ground at 2.5 to 3m (8-10 ft.) intervals around the27ground ring and tower, and welded to it. The resistance to earth of the ground ring shall27be 25 ohms or less, with a preferred value of less than 5 ohms. See Nortel CS4122.0027and DSAP65BA (Cell Site Power and Grounding) for further information.27_____________________27Fig. 10.1 Cell Site Grounding Connections2711.0 References28[1] CMS-MTX/CDMA MCBTS 1900 Outdoor and MCBTS Base Platform. Product28Specification Agreement. by Neil McGowan and Frank van Heeswyk.28[2] CDMA MCBTS 1900 Outdoor. Power Protection and Grounding Design Specification.28by Ed Norman28.28[3] CDMA MCBTS 1900 Outdoor. General Specification.28[4] MCBTS 1900 MHz Radio Enclosure System Packaging Specification. by Fred Folk.28[5] MCBTS Optical Link NTGS05AA, NTGS0117, NTGS0095 Functional Agreement.28Packaging Concepts Methodology.28[6] MCBTS Digital Enclosure Mechanical Assembly NTGS13AA Functional Agreement.28Packaging Concepts Methodology.28_____________________28Dimensioni: 328 KBPagine: 28Language: EnglishApri il manuale