Airspan AS3010 Manual

Connecting the World with Wireless Access Solutions
WipLL and AS3010
WipLL and AS3010WipLL and AS3010
WipLL and AS3010
Systems
SystemsSystems
Systems
Wireless IP-Based Local Loop System
Release 4.2B
Hardware Installation
Guide

The WipLL product bears the CE marking. This CE marking demonstrates WipLL's full compliance with applicable
European Union (EU) directives:
The WipLL product bears the Underwriters Laboratories (UL) marking, demonstrating full compliance with UL's
safety requirements:
WipLL products also bear the Federal Communications Commission (FCC) marking, demonstrating compliance
with FCC Part 15 regulations.
Revision Record: WipLL Hardware Installation Guide
Pub. Rev. Date Update Description
- Nov-00 First edition and printing. (Marconi)
- Mar-01 WipLL Release 1.4 (Marconi)
- Apr-01 WipLL Release 2.0 (Marconi)
- Jul-01 WipLL Release 2.2 (Marconi)
- Nov-01 WipLL Release 2.6 (Marconi)
- Jun-02 WipLL Release 3.0A (Marconi)
01 Feb-03 WipLL Release 4.0. Author: InterDoc. Updates: Airspan template and content
(connector pinouts; cable crimping, and general)
02 May-03 WipLL Release 4.2F. Author: InterDoc. Updates: graphics, deleted BSR with
serial port.
03 Jul-03 WipLL Release 4.2A. Author: InterDoc. Updates: Chapter 1 for Transparent
Bridging; 5.8 GHz; 2.8 GHz.
04 Aug-03 WipLL Release 4.2A. Author: InterDoc. Updates: formatting; graphics; BSDU
LEDs
05 Oct-03 WipLL & AS3010 Rel. 42B. Auth: InterDoc. Updates: RSSI Plug for SPR; IDR
RSSI levels; SDA-4S/Vltag; safety guidelines; Append. D.
Publication No. 02030311-05

Copyright by Airspan Networks LTD., 2003. All rights reserved worldwide.
The information contained in this document is proprietary and is subject to all relevant copyright, patent and other
laws protecting intellectual property, as well as any specific agreement protecting Airspan Networks LTD. rights in
the aforesaid information. Neither this document nor the information contained herein may be published,
reproduced or disclosed to third parties, in whole or in part, without the express, prior, written permission of
Airspan Networks LTD. In addition, any use of this document or the information contained herein for any purposes
other than those for which it was disclosed is strictly forbidden.
Airspan Networks LTD. reserves the right, without prior notice or liability, to make changes in equipment design or
specifications.
Information supplied by Airspan Networks LTD. is believed to be accurate and reliable. However, no responsibility
is assumed by Airspan Networks LTD. for the use thereof nor for the rights of third parties which may be effected
in any way by the use thereof.
Any representation(s) in this document concerning performance of Airspan Networks LTD. product(s) are for
informational purposes only and are not warranties of future performance, either express or implied. Airspan
Networks LTD. standard limited warranty, stated in its sales contract or order confirmation form, is the only
warranty offered by Airspan Networks LTD. in relation thereto.
This document may contain flaws, omissions or typesetting errors; no warranty is granted nor liability assumed in
relation thereto unless specifically undertaken in Airspan Networks LTD. sales contract or order confirmation.
Information contained herein is periodically updated and changes will be incorporated into subsequent editions. If
you have encountered an error, please notify Airspan Networks LTD. All specifications are subject to change
without prior notice.
Main Operations:
Airspan Communications Ltd.
Cambridge House
Oxford Road
Uxbridge
Middlesex
UB8 1UN
United Kingdom
Tel: [phone]
Web site: http//www.airspan.com
Customer Service (TAC): [email protected] or ([phone]

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Hardware Installation Guide Contents
02030311-05 Airspan Networks Ltd. v
Contents
About this Manual................................................................................................ xiii
Purpose....................................................................................................... xiii
Targeted Audience...................................................................................... xiii
Organization of this manual......................................................................... xiv
Conventions .................................................................................................xv
Technical support ......................................................................................... xv
1. Introduction .............................................................................................. 1-1
1.1. Main Features ..................................................................................... 1-2
1.2. Customer Benefits............................................................................... 1-3
1.3. System Architecture ............................................................................ 1-4
1.3.1. Base Station ......................................................................... 1-5
1.3.2. Subscriber Site ..................................................................... 1-8
1.3.3. Network Operations Center ................................................ 1-12
1.4. Applications....................................................................................... 1-13
1.4.1. Broadband Data Access..................................................... 1-13
1.4.2. High Speed Internet Access ............................................... 1-14
1.4.3. Voice over IP ...................................................................... 1-15
1.4.4. Traffic Engineering in Multi-Tenant Application .................. 1-16
1.4.5. Repeater Solution............................................................... 1-17
2. Safety Guidelines ..................................................................................... 2-1
2.1. General Safety Guidelines .................................................................. 2-2
2.2. Electrical Safety Guidelines................................................................. 2-2
2.2.1. Handling Electrostatic Devices ............................................. 2-3
2.2.2. Grounding............................................................................. 2-4
2.3. Lightening Protection........................................................................... 2-4
2.4. Installing Outdoor Units and Third-Party External Antennas............... 2-5
2.5. Radio Interference Prevention............................................................. 2-5

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vi Airspan Networks Ltd. 02030311-05
2.6. Cabling ................................................................................................ 2-6
2.6.1. General................................................................................. 2-6
2.6.2. Labeling ................................................................................ 2-7
2.6.2.1. Voltage Warning .................................................... 2-7
2.6.2.2. High Earth Leakage Current .................................. 2-8
2.6.2.3. Signal Cable Designation....................................... 2-9
3. Part List and Required Tools .................................................................. 3-1
3.1. Unpacking and Verifying Contents...................................................... 3-1
3.1.1. Base Station Equipment ....................................................... 3-1
3.1.1.1. BSR........................................................................ 3-2
3.1.1.2. BSDU (optional) ..................................................... 3-3
3.1.1.3. BSPS (optional) ..................................................... 3-4
3.1.1.4. GPS (optional) ....................................................... 3-4
3.1.2. Customer Premises Equipment............................................ 3-5
3.1.2.1. SPR........................................................................ 3-5
3.1.2.2. RSSI LED Plug ...................................................... 3-6
3.1.2.3. SDA........................................................................ 3-6
3.1.2.4. IDR kit .................................................................... 3-9
3.2. Required Tools.................................................................................. 3-10

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02030311-05 Airspan Networks Ltd. vii
Part I: Installing WipLL Base Station Equipment
4. Installing the BSR..................................................................................... 4-1
4.1. Overview ............................................................................................. 4-2
4.2. Physical Dimensions and Basic Design .............................................. 4-3
4.3. Cable Installation Guidelines............................................................... 4-4
4.4. Connecting BSR for Serial Configuration............................................ 4-6
4.5. Connecting BSR to the Backhaul Network........................................ 4-11
4.5.1. Through the SDA................................................................ 4-11
4.5.2. Through the BSDU ............................................................. 4-16
4.6. Conecting a Third-Party External Antenna (Optional) ....................... 4-20
4.7. Connecting BSR to Power................................................................. 4-22
4.8. Mounting the BSR ............................................................................. 4-23
4.8.1. Minimum Distance Between BSRs..................................... 4-24
4.8.2. Wall Mounting..................................................................... 4-25
4.8.3. Pole Mounting..................................................................... 4-28
5. Installing the BSDU .................................................................................. 5-1
5.1. Overview ............................................................................................. 5-2
5.2. Physical Dimensions and Basic Design .............................................. 5-3
5.3. Rack-Mounting .................................................................................... 5-5
5.4. Connecting to BSRs............................................................................ 5-7
5.5. Connecting to the GPS Antenna ......................................................... 5-7
5.6. Connecting to 100Base-T Networks.................................................... 5-8
5.7. Daisy-Chaining BSDUs ....................................................................... 5-9
5.8. Connecting Sync IN/OUT ports ......................................................... 5-11
5.9. Connecting to BSPS for Power Management ................................... 5-13
5.10. Connecting to PC for Serial Management....................................... 5-16
5.11. Connecting to PC for Network IP Management .............................. 5-18

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viii Airspan Networks Ltd. 02030311-05
5.12. Connecting to Power....................................................................... 5-21
5.12.1. Grounding the BSDU........................................................ 5-22
5.12.2. Connecting to Power Supply (BSPS) ............................... 5-23
5.13. LED Indicators................................................................................. 5-25
5.13.1. BSR’s LEDs...................................................................... 5-25
5.13.2. 100Base-T LEDs .............................................................. 5-26
5.13.3. Status LEDs...................................................................... 5-27
6. Installing the GPS..................................................................................... 6-1
6.1. Mounting the GPS............................................................................... 6-2
6.2. Connecting to the BSDU ..................................................................... 6-3
7. Installing the BSPS .................................................................................. 7-1
7.1. Overview ............................................................................................. 7-2
7.1.1. BSPS Components............................................................... 7-3
7.1.2. General Site Requirements .................................................. 7-6
7.1.3. BSPS Cabinet Cabling ......................................................... 7-7
7.2. BSPS Installation Summary ................................................................ 7-9
7.3. Installing BSPS Batteries .................................................................. 7-12
7.4. Rectifiers ........................................................................................... 7-15
7.4.1. Installing ............................................................................. 7-15
7.4.2. Calibrating .......................................................................... 7-16
7.5. Operating the System Controller ....................................................... 7-18
7.6. Connecting BSPS Power to BSDUs.................................................. 7-20
7.7. Connecting BSPS Management Cables ........................................... 7-22
7.8. BSPS Cabinet Power Requirements................................................. 7-24
7.8.1. BSPS Cabinet Grounding................................................... 7-26
7.8.2. BSPS Equipment Supplementary Grounding..................... 7-27
7.9. BSPS Troubleshooting...................................................................... 7-27

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02030311-05 Airspan Networks Ltd. ix
Part II: Installing WipLL Customer Premises Equipment
8. Installing the SPR..................................................................................... 8-1
8.1. Overview ............................................................................................. 8-2
8.2. Physical Dimensions and Basic Design .............................................. 8-5
8.3. Cable Guidelines................................................................................. 8-6
8.4. Mounting the SPR ............................................................................... 8-7
8.4.1. Minimum Distance between SPRs ....................................... 8-8
8.4.2. Wall-Mounting....................................................................... 8-9
8.4.3. Pole-Mounting .................................................................... 8-12
8.5. Connecting an External Third-Party Antenna (Optional) ................... 8-15
8.6. Connecting to the SDA...................................................................... 8-16
8.7. Connecting to a PC for Serial Configuration ..................................... 8-21
8.8. Connecting the RSS LED Adapter .................................................... 8-25
8.9. Connecting Power............................................................................. 8-29
9. Installing the SDA..................................................................................... 9-1
9.1. Overview ............................................................................................. 9-2
9.2. Physical Dimensions and Basic Design .............................................. 9-5
9.3. Mounting the SDA ............................................................................... 9-7
9.3.1. Desktop-Mounting ................................................................ 9-7
9.3.2. Wall-Mounting....................................................................... 9-8
9.4. Connecting to the SPR........................................................................ 9-9
9.5. Connecting to the Subscriber’s Ethernet Network............................... 9-9
9.5.1. Connecting to PCs.............................................................. 9-12
9.5.2. Connecting to a Hub........................................................... 9-14
9.5.3. Connecting to a VoIP Network ........................................... 9-17
9.6. Connecting AC Power....................................................................... 9-19
9.7. LED Display....................................................................................... 9-23
9.7.1. SDA-4H .............................................................................. 9-23
9.7.2. SDA-4S Models .................................................................. 9-25

Contents Hardware Installation Guide
x Airspan Networks Ltd. 02030311-05
10. Installing the IDR.................................................................................... 10-1
10.1. Overview ......................................................................................... 10-2
10.2. Physical Dimensions and Basic Design .......................................... 10-4
10.3. Mounting the IDR ............................................................................ 10-5
10.3.1. Desk Mounting.................................................................. 10-5
10.3.1.1. Vertical-Desk Mounting...................................... 10-6
10.3.1.2. Horizontal-Desk Mounting.................................. 10-7
10.3.2. Wall and Pole Mounting.................................................... 10-8
10.3.2.1. Assembling the Bracket and Hanger Plate ........ 10-8
10.3.2.2. Pole Mounting .................................................. 10-11
10.3.2.3. Wall Mounting .................................................. 10-13
10.4. Connecting a Third-Party External Antenna.................................. 10-14
10.5. Connecting to an Ethernet Network .............................................. 10-16
10.5.1. Ethernet LED Indicator ................................................... 10-18
10.6. Positioning IDR for Optimum RF Reception.................................. 10-18
10.7. Connecting to PC for Serial Configuration .................................... 10-20
10.8. Connecting Power......................................................................... 10-23
10.8.1. Power LEDs.................................................................... 10-26
A. Glossary ....................................................................................................A-1
B. Cable Crimping.........................................................................................B-1
B.1. Crimping CAT-5e Cable for 15-Pin D-Type Connectors ..................... B-2
B.1.1. Stripping the Cable...............................................................B-4
B.1.2. Crimping the Cable ..............................................................B-5
B.1.3. Inspecting the Crimped Connector....................................... B-6
B.1.4. Housing the Connector ........................................................ B-8
B.2. Crimping N-type Connectors............................................................. B-10
B.2.1. Stripping the Cable.............................................................B-10
B.2.2. Assembling the Connector .................................................B-12
B.2.3. Crimping.............................................................................B-13
B.3. Crimping GPS Cable Connectors ..................................................... B-15

Hardware Installation Guide Contents
02030311-05 Airspan Networks Ltd. xi
C. Technical Specifications .........................................................................C-1
C.1. Base Station WipLL Equipment..........................................................C-2
C.1.1. Base Station Radio (BSR) ...................................................C-3
C.1.2. Point-to-Point Radio (PPR) ..................................................C-6
C.1.3. Base Station Distribution Unit (BSDU).................................C-7
C.1.4. Base Station Power Supply (BSPS) ....................................C-8
C.1.5. GPS antenna .....................................................................C-11
C.2. Customer Premises WipLL Equipment.............................................C-12
C.2.1. Subscriber Premises Radio (SPR).....................................C-12
C.2.2. Subscriber Data Adapter (SDA).........................................C-15
C.2.2.1. SDA-1..................................................................C-15
C.2.2.2. SDA-4H ...............................................................C-16
C.2.2.3. SDA-4S Models...................................................C-17
C.2.3. Indoor Data Radio (IDR) ....................................................C-18
D. Summary of Connector Pinouts .............................................................D-1
D.1. BSR/SPR-to-BSDU/SDA CAT 5 Connector Pinouts ..........................D-1
D.2. SPR and BSR Serial Connector Pinouts ............................................D-3
D.3. BSDU Connector Pinouts ...................................................................D-5
D.3.1. BSDU Daisy Chaining..........................................................D-5
D.3.2. BSDU Synchronization ........................................................D-5
D.3.3. BSDU Serial Management...................................................D-6
D.3.4. BSDU PC Network Management.........................................D-7
D.3.5. BSDU 100Base-T ................................................................D-8
D.4. GPS-to-BSDU Connector Pinouts ......................................................D-8
D.5. Connector Pinouts for BSPS Serial Management via BSDU..............D-9
D.6. IDR Connector Pinouts .......................................................................D-9
D.6.1. Serial Management Connection...........................................D-9
D.6.2. Ethernet LAN Connection ..................................................D-10
D.7. SDA Ethernet LAN Connector Pinouts .............................................D-11

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02030311-05 Airspan Networks Ltd. xiii
About this Guide
About this GuideAbout this Guide
About this Guide
This section discusses the purpose, targeted audience, references, organization, and
technical support of the WipLL Hardware Installation Guide.
Purpose
This guide describes the procedures for installing Airspan’s WipLL devices. These
devices include the Base Station Radio (BSR), Base Station Distribution Unit
(BSDU), Base Station Power Supply (BSPS), Global Positioning System antenna
(GPS), Subscriber Premises Radio (SPR), Subscriber Data Adapter (SDA), and
Indoor Data Radio (IDR).
Although this guide provides software configuration information for certain WipLL
devices, it is not comprehensive. For detailed software configuration information,
see the WipLL Commissioning Manual, WipConfig User's Guide, and WipManage
User's Guide.
Targeted Audience
This guide is intended for the person who is responsible for installing the WipLL
system, and who should be familiar with electronic circuitary and wiring.

About this Guide Hardware Installation Guide
xiv Airspan Networks Ltd. 02030311-05
Organization of this Guide
This guide is organized into the following chapters and parts:
! Chapter 1, “Introduction”: provides a brief overview of the WipLL hardware
devices.
! Chapter 2, “Safety Guidelines”: lists the safety guidelines for handling cables
and electricity during the installation.
! Chapter 3, “Part List and Required Tools”: lists the equipment provided by
Airspan, as well as the tools needed for installation.
! Part 1, “Installing WipLL Base Station Equipment”: includes the following
chapters concerned with installing WipLL equipment at the base station:
! Chapter 4, “Installing the BSR”
! Chapter 5, “Installing the BSDU”
! Chapter 6, “Installing the GPS”
! Chapter 7, “Installing the BSPS”
! Part 2, “Installing WipLL Customer Premises Equipment”: includes the
following chapters concerned with installing WipLL equipment at the
subscriber’s premises:
! Chapter 8, “Installing the SPR”
! Chapter 8, “Installing the SDA”
! Chapter 9, “Installing the IDR”
! Appendix A, “Glossary”: glossary of terms used in this guide
! Appendix B, “Cable Crimping”: describes the crimping procedure for 15-Pin
D-type, N-type, and GPS connectors.

Hardware Installation Guide About this Guide
02030311-05 Airspan Networks Ltd. xv
! Appendix C, “Technical Specifications”: lists the technical specifications of the
WipLL units.
! Appendix D, “Summary of Connector Pinouts”: provides a sumary of the
connector pinouts and color-wiring for CAT 5 cable connectors.
Conventions
This guide uses the following bulletin conventions:
Note: Provides useful information.
Warning: Provides information that can prevent and avoid bodily o
r
mechanical harm.
Technical Support
For service and support for your WipLL system, contact your regional Airspan
representative, or Airspan’s Technical Assistance Center (TAC) at:
! Telephone hotline: [phone]
! E-mail: [email protected]

02030311-05 Airspan Networks Ltd. 1-1
Introduction
IntroductionIntroduction
Introduction
Airspan’s AS WipLL system (hereafter referred to as WipLL) is a low-cost, high-
performance point-to-multipoint IP-based Broadband Fixed Wireless (BFW) Access
solution. WipLL provides wireless local-loop (last-mile) connectivity designed to
deliver high-speed data, Voice over IP (VoIP), and multimedia services to
residential, SOHO (small office/home office), and SME (small medium enterprise).
WipLL offers service providers an integrated access solution, providing quick-to-
market deployment and low-market entry cost for broadband services.
WipLL provides connectivity speeds of up to 4 Mbps in the licensed 2.8 GHz, 3.x
GHz, and Multichannel Multipoint Distribution Services (MMDS), and unlicensed
900 MHz, 2.4 GHz (ISM), and 5.8 GHz radio frequency bands. Each WipLL base
station, at maximum configuration, supports up to 3,024 subscribers.
WipLL enables interconnection with the Public Switched Telephone Network
(PSTN) by the use of an IP-to-PSTN gateway. WipLL provides VoIP by its
interoperability with a wide range of third-party products such as residential
gateways (RGW), access gateways, gatekeepers, and softswitches.
WipLL utilizes air protocol technology for wireless packet switching using
Frequency Hopping technology. In addition, WipLL's in-house Preemptive Polling
Multiple Access (PPMA) air MAC protocol technology, which recognizes
transmission type and assigns bandwidth, is highly efficient—80% throughput (e.g.,
80% of 4 Mbps = 3.2 Mbps net capacity)—allowing multiple concurrent subscribers
to utilize bandwidth.
WipLL provides bandwidth management by supporting Committed Information
Rate (CIR) and Maximum Information Rate (MIR), guaranteeing bandwidth levels
to subscribers. In addition, WipLL supports VLANs/VPNs based on IEEE
802.1Q/p. WipLL supports IP routing and PPPoE bridging, as well as transparent
bridging.
1

Introduction Hardware Installation Guide
1-2 Airspan Networks Ltd. 02030311-05
WipLL provides embedded security features such as IP (packet) filters based on
addresses, protocols, and applications.
The WipLL system provides SNMP-based management, allowing remote and local
management, configuration, and monitoring of WipLL equipment.
1.1. Main Features
The WipLL system includes the following main features:
! Low initial investment, maximum return on investment (ROI)
! Packet-based air interface supporting high speed data, VoIP, and multimedia
services
! Modular architecture with flexible deployment architectures
! 4 Mbps (3.2 Mbps net) per sector—up to 24 sectors per base station
! Compact, integrated design allowing easy and quick deployment
! Advanced Quality of Service (QoS)
! Simultaneous support of IP routing and PPPoE bridging
! Supports transparent bridging, allowing easy IP addressing schemes
! Bandwidth management: CIR and MIR
! Supports 802.1Q/p for VLANs/VPNs and end-to-end QoS
! Provides automatic connection to base stations of first-time powered-on and
unconfigured subscriber devices
! Allows redirection of subscriber devices to different base station radios
! Supports configuration files, allowing the same configuration settings to be
applied to multiple WipLL devices
! Supports local and remote SNMP-based management, providing an intuitive
GUI for easy management

Hardware Installation Guide Introduction
02030311-05 Airspan Networks Ltd. 1-3
1.2. Customer Benefits
The WipLL system provides the following customer benefits and advantages over
competitors:
! No IF or RF cables required for indoor unit-to-outdoor unit (IDU-to-ODU)
connectivity, providing a more cost-effective and easier installation. Instead of
IF/RF cables, WipLL implements standard CAT-5 Ethernet cables.
! Scalability and modular base station architecture allows customers to add
equipment when needed, thereby allowing low initial cost entry and pay-as-you-
grow strategy. Unlike competitors, the WipLL base station is not a chassis-based
design, providing flexibility and saving space at the base station.
! WipLL's open architecture allows interoperability with multi-vendor products
such as residential gateways (RGW), access gateways, gatekeepers, and
softswitches, thereby, operating seamlessly in multi-vendor environments.
! WipLL’s proprietary PPMA air MAC protocol is highly efficient—80%
throughput—allowing multiple concurrent subscribers to utilize bandwidth
without network degradation (from collisions and high BER).
! Long-distance radio coverage.
! WipLL is both an IP router and a PPPoE bridge.
! Supports transparent bridging for easy implementation of IP addressing schemes
! WipLL’s IP routing provides efficiency and eliminates the need for additional
hardware.
! Enhanced QoS—based on IP addresses, protocols, and applications.
! End-to-end QoS—based on DiffServ/TOS or 802.1p.
! Fast-and-easy installation and configuration using WipLL Auto Connect.
! Embedded security features such as IP (packet) filters based on addresses,
protocols, and applications.
! Rich networking packages such as 802.1Q/p VLANs/VPNs.

Introduction Hardware Installation Guide
1-4 Airspan Networks Ltd. 02030311-05
1.3. System Architecture
The WipLL system architecture is composed of the following three basic areas (see
Figure 1-1):
! Base station site: consists of WipLL access units that interface between the
provider’s backbone and the WipLL system.
! Subscriber site: consists of WipLL customer premises equipment (CPE) that
interfaces between the base station and the subscriber’s network.
! Network operations center (NOC): consists of the WipLL SNMP-based
management system that manages the entire WipLL system.
Subscriber
Site
Subscriber
Site
Subscriber
Site
Subscriber
Site
Subscriber
Site
Subscriber
Site
Subscriber
Site
Base Station
Site
Base Station
Site
Base Station
Site
Base Station
Site
Network
Non IP Systems
Network
Operating
Centre
Non WiPLL
Users
Figure 1-1: WipLL System Architecture

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02030311-05 Airspan Networks Ltd. 1-5
1.3.1. Base Station
The WipLL base station provides a radio link between the subscriber and the service
provider's backbone to provide high-speed data access, Internet access, and VoIP.
The WipLL base station equipment consists of a radio transceiver that transmits and
receives signals to and from the subscriber, and of various optional routers and
switches that connect the WipLL transceiver to the service provider’s backbone,
through a 100BaseT Ethernet connection.
The WipLL base station is comprised of the following units (see Figure 1-3):
! Base Station Radio (BSR):
The BSR is a radio transceiver that provides the wireless link between the
subscriber and the provider's backbone. The standard BSR has 60-degree radio
coverage, serving up to 126 subscribers in that sector.
The BSR is installed outside the base station site, typically mounted on a pole.
! Point-to-Point Radio (PPR):
The PPR device is similar to the BSR, but implemented in a point-to-point radio
configuration providing wireless communication with a single remote WipLL
radio unit (i.e., Subscriber Premises Radio).
Figure 1-2: PPR in a building-to-building application