Product Info
Table Of Contents
- FCC ID AB6NT1900FRM
- NORTEL CDMA METRO CELL
- (MetroDE -- MetroRE)
- 800/1900 MHz
- Outdoor Cell Site Requirements
- Issue 0.02
- Document: NORTEL CDMA Metro Cell (MetroDE -- MetroRE)
- Cell Site Requirements
- February, 2001
- NORTEL Wireless Networks
- CDMA BTS Radio Development
- BTS Radio Systems 2M41
- Security Warning:
- The information contained in this document is the property of Northern Telecom
- Ltd. The holder of this document shall keep all information contained herein
- confidential and shall protect the same in whole or in part from disclosure and
- dissemination to all third parties.
- Table of Contents
- 1.0 Executive Summary
- 2.0 Introduction
- This document outlines the cell site engineering requirements for the CDMA MCBTS 1900 System. Its...
- Specifications in the Product Specification |agreement (PSA) shall take precedence over informati...
- The MCBTS cell site requirements fall into six main categories:
- The mechanical requirements cover the physical characteristics (weight, size), the mounting requi...
- The MCBTS (Metrocell) will be deployed in a number of environments potentially both indoors and o...
- 3.0 Environmental Requirements
- 4.0 Mechanical Requirements
- 4.1 Physical Specifications
- 4.2 Digital Enclosure
- 4.3 Digital Enclosure Interface
- 4.4 External Battery Cabinet
- 4.5 General Cabinet Anchoring
- 4.6 Pad mounting
- 4.7 Rubber Isolation Pad
- 5.0 AC Power Requirements
- 5.1 Power Specifications
- Commercial AC power will be supplied to the DE as a single/split-phase, 120/240 Vac nominal, or 1...
- The DE ac power input requirements are as follows:
- • Nominal Input Voltage: 240/120 Vac, single, split phase, 50/60 Hz
- • Input Voltage Range: 178 to 264 Vac
- • Input Frequency: 47 - 63 Hz
- • Power factor: greater than 90% at nominal line voltage and frequency
- • Input current rating 70A, 2-pole circuit breaker
- 5.2 AC Power Connection
- 5.1 Power Specifications
- 6.0 RF Overlay Requirements
- The Metro Cell has several overlay options
- Basic installation configuration (single channel)
- Simple overlay or mini configuration
- The Metro Cell can accommodate 1900 MHz FRM’s, 800 MHz FRM’s, or combinations of both.
- The FRM is illustrated in Figure 16. Each FRM consists of the following main
- components: duplexer pre-selector module (DPM) or triplexer module, transmit receive
- module (TRM), power amplifier module (PAM) and fan/plenum assembly. The alarm
- indicator module (AIM) is located within the fan unit housing. The PAM, TRM, and fan
- unit have the same mechanical dimensions for both 800 MHz and 1900 MHz
- configurations. The 800 MHz DPM is taller than the 1900 MHz DPM.
- The minimum requirement (1 carrier) is 2 antennas per sector, one for the main path (Tx and one d...
- Table 6.1:
- 6.1 Cable Connections
- The optical link cable, SFRM DC power cable and the GPS antenna cable have a provisionable length...
- The quantity of inter-DFRM cables required depends upon the application. In a single carrier syst...
- Two sample configurations will be considered for illustrative purposes. These are:
- i) a basic system with no redundancy;
- ii) a premium system with all redundancy
- 7.0 GPS Receiver
- Timing and frequency reference information provided by the GPS receiver is critical to the proper...
- The antenna should be installed to provide the best view of the entire sky. A complete view of th...
- The maximum distance between Metrocell and GPS antenna is set by the maximum allowable cable loss...
- Connections and Cabling
- 8.0 Connections and Cabling
- 8.1 FRM Power Connections and Cables
- DC power is conducted to individual FRMs via two conductor (-48V, BR) shielded (ground) cables, o...
- The specifications for these external FRM dc cables are as follows:
- • less than 3000 feet, use 2 conductor #8 AWG shielded cable
- • Between 300 and 600 feet, use 2 conductor #6
- • Allowed cable voltage drop: 6 Vdc maximum (-48V and Rtn combined)
- • Cable terminations: two-hole lugs at the DEI BRR plate, twist-lock type
- connector at FRM (to mate with the PEM)
- • Shield termination: grounded at both the FRM and DEI ends, and at the base of
- the tower
- The FRM DC cable is sized for voltage drop, not ampacity
- The optical link enters the FRM via the electro-optic module (EOM)
- 8.2 FRM Interconnect
- 8.3 Fiber
- 8.1 FRM Power Connections and Cables
- 9.0 T1/E1 Connections
- The CM module has up to 6T1 interfaces connected through the backplane. The cable will probably b...
- The Metro Cell can be connected to the BSC using 1 to 6 T1/E1 links. These T1/E1 links are distri...
- There are two ways of connecting T1/E1 to the Metro Cell. The T1/E1 cables can be
- directly brought into the DEI or they can be connected to a RJ48H connector which
- interfaces with the DEI. The RJ48H connector cable NTGS0106 is provisionable. In the
- DEI T1/E1 connections are done on the middle and lower blocks among the three
- Telephone/Data Line Protection blocks as shown in Figure 87. The RJ48H connector is
- shown in Figure 88 and the pinout is shown in Table 30.
- The number of T1/E1s that need to be connected to the Metro Cell depends on the call
- carrying capacity of the T1/E1s and the number of calls that a Metro Cell has to make.
- The number of T1/E1 that need to be provisioned for a Metro Cell can be determined
- from Ref [10].
- The two modes of operation of Metro Cell are regular (or non-split) mode or split mode.
- In the regular mode only one DCG is active, the other DCG may not be provisioned or is
- a redundant DCG. In the split mode both DCGs are provisioned and are active. Each
- DCG in the split mode is a logical BTS. The T1/E1 connections of the Metro Cell in the
- regular and split mode are done as shown in Table 27.
- The T1/E1 lines are connected to one of the two BTSI cards in the control module (CM)
- Table 27: T1/E1 Connections of Metro Cell without Daisy Chaining
- The T1/E1 lines are connected to one of the two BTSI cards in the control module (CM)
- which forms part of the DCG. The connections are controlled by relays and are exclusive
- to one DCG. Therefore if T1/E1 #1 is connected to the first DCG then the same lines
- cannot be connected to the other DCG. This is true in regular as well as split mode. In
- regular mode since only one DCG is active, therefore, all the T1/E1s are connected to
- the active DCG. When the redundant DCG takes over then the connections are switched
- to it by closing the relays on this new active DCG and opening them on the previously
- active DCG. The middle column of Table 27 shows how the T1/E1 connections are done
- for the active DCG in regular mode. In the split mode each DCG is active and is part of
- the logical BTS. Therefore, each DCG has its own independent T1/E1 connections. The
- right column of Table 27 shows how the T1/E1 connections are done for the two logical
- BTSs in the split mode. It is clear from [1] that a single DCG, supporting a maximum of
- two carriers, does not need more than 3 T1/E1 connections. So, the connections shown
- in Table are reasonable and will provide for a redundant T1/E1 link per logical BTS in
- most cases (keeping in mind the number of T1/E1 links needed for 2 carriers as
- mentioned in [10]).
- The Metro Cell can be configured for a shorthaul link or a longhaul link. In case of a
- shorthaul configuration the Metro Cell should be within 655ft of the last repeater while for
- a longhaul link the Metro Cell should be within 6000ft of the last repeater using 22 gauge
- unshielded twisted pair cable i.e. 100 ohm 22 gauge cable. The shorthaul and longhaul
- link is configured using software. The distance of the Metro Cell from the last repeaterhas to ma...
- 10.0 Grounding
- 10.1 BTS grounding Architecture
- 10.2 Antenna Grounding
- 10.3 Radio rack Grounding
- The common ground point in the RE is the subframe. A #2 AWG cable will connect the
- subframe to the main ground point in the DEI in the side-by-side configuration. When the
- RE is installed remotely from the DEI/DE the ground cable will connect the subframe to
- the site ground in that area. Attachment shall be made with two hole compression lugs.
- The shield of the DC power cable connecting the main electronics cabinet to the FRM
- shall be grounded at both the FRM end and the main enclosure end (main ground plate)
- .
- Provision one NTGS0161 main site ground cable for the DEI/DE and one for every RE.
- 10.4 Site Ground Ring
- A peripheral grounding ring, usually buried around the site perimeter, or routed along the outer ...
- equipotential reference to minimize differential voltages during lightning surges. It
- consists of a #2 AWG (or larger) uninsulated, tinned copper conductor. Connections are
- made to it using C-tap clamps.
- The ground ring makes earth contact through ground electrodes, typically copper-clad
- stakes 3m (10 ft.) long, driven into the ground at 2.5 to 3m (8-10 ft.) intervals around the
- ground ring and tower, and welded to it. The resistance to earth of the ground ring shall
- be 25 ohms or less, with a preferred value of less than 5 ohms. See Nortel CS4122.00
- and DSAP65BA (Cell Site Power and Grounding) for further information.
- _____________________
- Fig. 10.1 Cell Site Grounding Connections
- 11.0 References
- [1] CMS-MTX/CDMA MCBTS 1900 Outdoor and MCBTS Base Platform. Product
- Specification Agreement. by Neil McGowan and Frank van Heeswyk.
- [2] CDMA MCBTS 1900 Outdoor. Power Protection and Grounding Design Specification.
- by Ed Norman
- .
- [3] CDMA MCBTS 1900 Outdoor. General Specification.
- [4] MCBTS 1900 MHz Radio Enclosure System Packaging Specification. by Fred Folk.
- [5] MCBTS Optical Link NTGS05AA, NTGS0117, NTGS0095 Functional Agreement.
- Packaging Concepts Methodology.
- [6] MCBTS Digital Enclosure Mechanical Assembly NTGS13AA Functional Agreement.
- Packaging Concepts Methodology.
- _____________________
METRO CELL OUTDOOR (DE/RE) CDMA BTS RADIO DEVELOPMENT
PROPRIETARY CELL SITE REQUIREMENTS
Issue 01 Stream 00 - 23 - Feb. 2001
Table 27: T1/E1 Connections of Metro Cell without Daisy Chaining
The T1/E1 lines are connected to one of the two BTSI cards in the control module (CM)
which forms part of the DCG. The connections are controlled by relays and are exclusive
to one DCG. Therefore if T1/E1 #1 is connected to the first DCG then the same lines
cannot be connected to the other DCG. This is true in regular as well as split mode. In
regular mode since only one DCG is active, therefore, all the T1/E1s are connected to
the active DCG. When the redundant DCG takes over then the connections are switched
to it by closing the relays on this new active DCG and opening them on the previously
active DCG. The middle column of Table 27 shows how the T1/E1 connections are done
for the active DCG in regular mode. In the split mode each DCG is active and is part of
the logical BTS. Therefore, each DCG has its own independent T1/E1 connections. The
right column of Table 27 shows how the T1/E1 connections are done for the two logical
BTSs in the split mode. It is clear from [1] that a single DCG, supporting a maximum of
two carriers, does not need more than 3 T1/E1 connections. So, the connections shown
in Table are reasonable and will provide for a redundant T1/E1 link per logical BTS in
most cases (keeping in mind the number of T1/E1 links needed for 2 carriers as
mentioned in [10]).
The Metro Cell can be configured for a shorthaul link or a longhaul link. In case of a
shorthaul configuration the Metro Cell should be within 655ft of the last repeater while for
a longhaul link the Metro Cell should be within 6000ft of the last repeater using 22 gauge
unshielded twisted pair cable i.e. 100 ohm 22 gauge cable. The shorthaul and longhaul
link is configured using software. The distance of the Metro Cell from the last repeater-