OPEN BASE STATION ARCHITECTURE INITIATIVE General Purpose Module (GPM) Specification Version.0 Issue.0 ()
0 0 0 0 Preface OBSAI description and specification documents are developed within the Technical Working Group of the Open Base Station Architecture Initiative Special Interest Group (OBSAI SIG). Members of the OBSAI TWG serve voluntarily and without compensation. The description and specifications developed within OBSAI represent a consensus of the broad expertise on the subject within the OBSAI SIG. The OBSAI SIG uses the following terminology in the specifications: Ä "shall" expresses a provision that is binding Ä "should" and "may" expresses non-mandatory provisions Ä "will" expresses a declaration of purpose on the part of the OBSAI SIG. It may be necessary to use "will" in cases where the simple future tense is required Use of an OBSAI reference or specification document is wholly voluntary. The existence of an OBSAI Specification does not imply that there are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the OBSAI Specification. Furthermore, the viewpoint expressed at the time a specification is approved and issued is subject to change brought about through developments in the state of the art and comments received from users of the specification. Every OBSAI Specification is subjected to review in accordance with the Open Base Station Architecture Initiative Rules And Procedures. Implementation of all or part of an OBSAI Specification may require licenses under third party intellectual property rights, including without limitation, patent rights (such a third party may or may not be an OBSAI Member). The Promoters of the OBSAI Specification are not responsible and shall not be held responsible in any manner for identifying or failing to identify any or all such third party intellectual property rights. The information in this document is subject to change without notice and describes only the product defined in the introduction of this documentation. This document is intended for the use of OBSAI Member s customers only for the purposes of the agreement under which the document is submitted, and no part of it may be reproduced or transmitted in any form or means without the prior written permission of OBSAI Management Board. The document has been prepared for use by professional and properly trained personnel, and the customer assumes full responsibility when using it. OBSAI Management Board, Marketing Working Group and Technical Working Group welcome customer comments as part of the process of continuous development and improvement of the documentation. The information or statements given in this document concerning the suitability, capacity, or performance of the mentioned hardware or software products cannot be considered binding but shall be defined in the agreement made between OBSAI members. However, the OBSAI Management Board, Issue.0 ()
0 0 0 Marketing Working Group or Technical Working Group have made all reasonable efforts to ensure that the instructions contained in the document are adequate and free of material errors and omissions. OBSAI liability for any errors in the document is limited to the documentary correction of errors. OBSAI WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS DOCUMENT OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL (INCLUDING MONETARY LOSSES), that might arise from the use of this document or the information in it. This document and the product it describes are considered protected by copyright according to the applicable laws. OBSAI logo is a registered trademark of Open Base Station Architecture Initiative Special Interest Group. Other product names mentioned in this document may be trademarks of their respective companies, and they are mentioned for identification purposes only. Copyright Open Base Station Architecture Initiative Special Interest Group. All rights reserved. Users are cautioned to check to determine that they have the latest edition of any OBSAI Specification. Interpretations: Occasionally questions may arise regarding the meaning of portions of standards as they relate to specific applications. When the need for interpretations is brought to the attention of OBSAI, the OBSAI TWG will initiate action to prepare appropriate responses. Since OBSAI Specifications represent a consensus of OBSAI Member s interests, it is important to ensure that any interpretation has also received the concurrence of a balance of interests. For this reason OBSAI and the members of its Technical Working Groups are not able to provide an instant response to interpretation requests except in those cases where the matter has previously received formal consideration. Comments on specifications and requests for interpretations should be addressed to: Peter Kenington Chairman, OBSAI Technical Working Group Linear Communications Consultants Ltd. Email: pbk@linearcomms.com Issue.0 ()
Contents Summary of changes... Scope... General.... Topology and Dimensioning Requirements.... Hot Insertion and Removal.... Signal Naming Conventions...0. Connector Naming and Orientation... GPM Interfaces.... Signal List.... Signal Specification..... Common Signals..... GPM Unspecified Signals... GPM Pin Assignments.... J Data Connector.... J Data Connector (Optional)...0. Power Connector... Glossary.... Abbreviations.... Definition of Terms... References.... OBSAI.... IEEE.... TIA/EIA... Issue.0 ()
Figures Figure - BTS Reference Architecture... Figure - Signal Direction Definition... Figure - Connector Positions and Naming (module rear view)... Issue.0 ()
List of Tables Table - GPM Signal Abbreviations...0 Table - GPM Interface signal list... Table - Electrical Characteristic Address Signals... Table - System Clock Electrical Parameters... Table - Data Connector J Pin Assignment... Table - Data Connector J Pin Assignment...0 Table - Power Connector P Pin Assignment... Table - Power Connector P Pin Assignment... Issue.0 ()
Summary of changes Version Approved by Date 0.0 Draft Mar 00 0.0 Draft Sep 00 0.0 Draft Oct 00 0.0 Draft Nov 00 0.0 Draft Jan 00.0 Approved by management board Mar 00 Issue.0 ()
Scope This document specifies the minimum base transceiver system (BTS) internal interfaces (i.e. System Interfaces) of the OBSAI General Purpose Module (GPM). It defines the General Purpose Module s physical implementation of OBSAI reference point RP, although other connectivity is possible. The GPM may be used to enable specific enhancements or added functionality. Those functions are not defined in this document. RP RP Iub or Abis Transport Block BaseBand Block RF Block RP General Purpose Block Control and Clock Block Control Traffic Clock 0 Figure - BTS Reference Architecture Issue.0 ()
General This module interface specification focuses on the physical interface requirements of the GPM. The actual BTS and GPM designs are out of the scope of this document. Guidelines for implementation are given where appropriate. 0 0. Topology and Dimensioning Requirements GPM access to all Control and Management Plane data, as well as all User Plane data is through a dedicated link to the Ethernet fabric. The GPM shall contain two fabric ports for connection to the primary and secondary (if present) Ethernet networks. The fabric ports shall be implemented as Ethernet type 00Base-TX or 000Base-T. In either case, both Ethernet interfaces on the GPM shall be of the same type. The GPM also receives system clocks and synchronization bursts from the Clock and Control Module (CCM). General Purpose Module redundancy can be supported optionally by a second GPM.. Hot Insertion and Removal All signals shall support hot insertion and removal. Hot insertion is supported on the module by delayed (insertion) and early (removal) switch on/off of the power supply by means of a last mating enable pin at the power connector. Every source and sink of a signal shall survive without any damage, if the connected signal is within its specified operating voltage range. Issue.0 ()
. Signal Naming Conventions All signal names start with a --letter abbreviation that describes the general function of the signal group. Abbreviation Full Name Comment MA Module Address - SA Shelf Address - MNC Module Not Connected Not Connected on Module FP Fabric Port - SCLK System Clock - GPMUS GPM Unspecified - GND Ground Digital Ground BPNC Backplane Not Connected Not Connected on Backplane Table - GPM Signal Abbreviations 0 The signal name abbreviation is followed by a numerical index to distinguish between several instances of a signal inside a signal group. The index starts with the value 0. Additionally a direction indication is attached for signal groups with receive (_RX), transmit (_TX) or bidirectional (_BI) signals, if there is a need to distinguish between those. The direction is derived from the physical characteristic at the module boundary. The direction of signals not explicitly indicated by the signal name is specified in the signal list (section.), or left unspecified intentionally. Issue.0 0 ()
Module RX TX BI Figure - Signal Direction Definition A signal group supporting more than one differential pair (e.g. 000 Base-T) uses alpha letters starting with DA (e.g. DA, DB, DC, ). Finally differential pair signals are denoted by a trailing + (positive) or (negative) symbol. This rule applies: Signal Name Abbreviation [Numerical Index] [_RX;_TX;_BI][DPair Index] [+;-] Issue.0 ()
. Connector Naming and Orientation Definitions: Ä Ä Ä Ä Female connectors use the reference designator prefix J Male connectors use the reference designator prefix P Mechanical guiding pins use the reference designator prefix G Mechanical guiding holes use the reference designator prefix H 0 A numerical index follows the designator prefix. This concept applies to the backplane connectors as well. This is not in the scope of this specification, but it is recommended to follow this guidance. In addition to the module index there is a slot index, which references the slot position. The following rule applies: Prefix [Module Index] This concept also applies to the backplane connectors. Although this is not within the scope of this specification, it is nevertheless recommended to follow this guidance. In addition to the module index, the backplane has a slot index, which references the slot position. The following rule applies to the backplane: Prefix [Module Index] [Slot Index] 0 Figure - shows the module connector naming. Issue.0 ()
PCB P P Optional Power Connector Power Connector J Data Connector (with Guide) J Optional Data Connector Figure - Connector Positions and Naming (module rear view) Issue.0 ()
GPM Interfaces. Signal List The GPM signal groups and the expected peer modules are listed below: No Signal Group Peer Module Comment Direction Technology Common Signals SA[0..] - Shelf address ( bit) I - MA[0..] - Module address ( bit) I - FP[0..]_TX[+,] FP[0..]_BIDA[+,-] FP[0..]_RX[+,] FP[0..]_BIDB[+,-] TM Fabric Port 0 and O I/O TM Fabric Port 0 and I I/O 00 Base-TX, 000 Base-T 00 Base-TX, 000 Base-T FP[0..]_BIDC[+,-] TM Fabric Port 0 and I/O 000 Base-T, FP[0..]_BIDD[+,-] TM Fabric Port 0 and I/O 000 Base-T SCLK[0..][+,-] CCM[0..] System Clock Input from CCM I LVDS BPNC Not Applicable General Purpose test and debug signals (#) - - GND Not Applicable Digital Ground - Passive GPM Unspecified Signals 0 GMUS Not Applicable General Purpose Signals - - GPM Power Signals PWR_POS Not Applicable Supply Positive - Power PWR_NEG Not Applicable Supply Negative - Power PWR_ENA Not Applicable Power Enable I - GND Not Applicable Digital Ground - - Table - GPM Interface signal list Issue.0 ()
Note : FP0 and FP can be implemented either in 00Base-TX or 000Base-T technology. Note : Not applicable Issue.0 ()
. Signal Specification This chapter specifies the GPM interface signals at the GPM boundary. The data and power connector signals are differentiated in groups: Ä Ä Ä Common Signals GPM Unspecified Signals Power 0 0 If necessary, additional requirements for the implementation are given in the signal subchapter... Common Signals Common signals are common to all modules and shall be supported. Common Signals are assigned to fixed pin positions within the data connector J, which is present at all modules.... Module and Shelf address The module (MA[0..]) and shelf address signals (SA[0..]) are used to give the module a unique hardwired address related to the shelf and slot position of the module. The GPM shall pull the address pins up. An address bit logic one is indicated by leaving the address pin unconnected on the backplane. A logic zero is indicated through connecting the respective pin to logic ground on the backplane. The address signals are static. Parameter Symbol Min Typical Max Unit Low level Input Voltage ( 0 ) Vil - - 0. Volt High level Input Voltage ( ) Vih.0 - - Volt Table - Electrical Characteristic Address Signals Issue.0 ()
0... System Clock Input The GPM may receive a 0.MHz System Clock provided by the CCM. The System Clock links in the system are point-to-point links. The GPM can have two differential clock inputs - one from each of the two CCMs, which together form a redundant pair. The System Clock timing parameters are specified in the RP Specification [OBSAI RP]. The electrical receiver characteristic of the GPM System Clock input shall follow the LVDS standard [ANSI/TIA/EIA--A]. The GPM shall terminate these backplane links with a differential impedance of 00 Å Ç 0%. Parameter Symbol Min Typical Max Unit Receiver Input Threshold V TH - - Ç 00 mv Differential Input Voltage V ID Ç 00 Ç 00 mv Comment [PK]: Missing reference Input Current (Power On) I IN_ON - - Ç 0 ua Input Current (Power Off) I IN_OFF - - Ç 0 ua Input Voltage Range V IN 0 -. V Differential Input Impedance Z IN 0 00 0 Å Table - System Clock Electrical Parameters In the GPM power-down state, the receiver input shall be in a high impedance state. Issue.0 ()
0... Ethernet Fabric Ports The common fabric ports 0 and are available on every module in the shelf. On the GPM module, these ports can be realized in two variants: Ä Fast Ethernet [00Base-TX] according to [IEEE 0.] clause Ä Gigabit Ethernet [00/000Base-T] according to [IEEE 0.] clause 0 The Gigabit Ethernet interfaces are not mandatory, but may be available in certain system configurations. Please refer to the OBSAI System Specification for more details [OBSAI System]. The data connector supports both types. In the case that the fabric ports use Fast Ethernet, the unused fabric port pins (quantity per port) shall be left as MNC... GPM Unspecified Signals GPM Unspecified Signals are optional. Their functional and electrical characteristics are not specified. If present, GPM Unspecified Signals shall be located on the data connector J or optional data connector J. Since they are not specified by OBSAI, connecting GPM Unspecified Signals may cause incompatibility with certain backplane configurations. Comment [PK]: Missing reference Issue.0 ()
GPM Pin Assignments. J Data Connector The data connector is specified in [OBSAI System] Appendix C. Coding style shall be used. J f e d c b a SA0 BPNC BPNC BPNC BPNC BPNC SA BPNC BPNC BPNC BPNC BPNC SA GND GND BPNC GND GND GND FP_BIDC+ FP_BIDA+ GND FP0_BIDC+ FP0_BIDA+ GND FP_BIDC- FP_BIDA- GND FP0_BIDC- FP0_BIDA- GND FP_BIDD+ FP_BIDB+ GND FP0_BIDD+ FP0_BIDB+ GND FP_BIDD- FP_BIDB- GND FP0_BIDD- FP0_BIDB- GPMUS MA MA MA MA MA0 GPMUS GND BPNC GND BPNC GND 0 BPNC GPMUS GND SCLK+ GND SCLK0+ BPNC GPMUS GND SCLK- GND SCLK0- GND GND GND GND GND GND GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS 0 GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS Table - Data Connector J Pin Assignment Note : Common Signals (section..) are indicated by an underline. Issue.0 ()
. J Data Connector (Optional) J f e d c b a GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS 0 GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS 0 GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS GPMUS Table - Data Connector J Pin Assignment Issue.0 0 ()
. Power Connector GPM modules shall be equipped with a power connector P (OBSAI Sequenced) specified in Table -. P Signal PWR_POS PWR_ENA PWR_NEG GND Table - Power Connector P Pin Assignment For additional supply current, the GPM may optionally be equipped with a second power connector P (OBSAI Sequenced or OBSAI Non-sequenced) specified in Table -. P Signal PWR_POS PWR_POS PWR_NEG PWR_NEG 0 Table - Power Connector P Pin Assignment Note : Pins and can only be used with the OBSAI non-sequenced connector. Issue.0 ()
Glossary. Abbreviations For the purposes of the present document, the following abbreviations apply: ABBREVIATION DESIGNATION BBM Base Band Module BTS Base Transceiver Station CCM Clock and Control Module ESD Electrostatic Discharge GND Ground LVDS Low Voltage Differential Signalling OBSAI Open Base Station Architecture Initiative GPM General Purpose Module RFM Radio Frequency Module RP Reference Point RP Reference Point RP Reference Point TM Transport Module 0. Definition of Terms For the purposes of the present document, the following terms and definitions apply: Common Signals: Common Signals are common to all modules and shall be supported. Common Signals are assigned to fixed pin positions at the Data Connector(s) which are present at all modules. Module Type Specific Signals: Module Type Specific Signals are specific to a certain module type (TM, CCM, BBM, RFM) and shall be supported. Module Type specific Signals shall be assigned to fixed pin positions at the Data Connector(s). Issue.0 ()
Module Type Unspecified Signals: Module Type Unspecified Signals are optional. Their functional and electrical characteristics are not specified. If present, Module Type Unspecified Signals shall be assigned to a range of pin positions at the Data Connector(s). The range of pin positions shall be fixed for a certain module type, but may differ between module types. Signal Group: A group of signals forming a functional entity e.g. a fabric port. Issue.0 ()
References. OBSAI [OBSAI System] OBSAI System Reference Document V.0 [OBSAI RP] OBSAI Reference Point Specification V. [OBSAI RP] OBSAI Reference Point Specification V0. [OBSAI RP] OBSAI Reference Point Specification V.0. IEEE 0 [IEEE 0.] [00Base-TX] IEEE Std, 0., Local and Metropolitan Area Networks, 00. IEEE Std, 0.u, Local and Metropolitan Area Networks,. [00/000Base-T] IEEE Std, 0.ab, Local and Metropolitan Area Networks,. 0. TIA/EIA [ANSI/TIA/EIA--A] TIA/EIA Std. -A. Electrical Characteristics of Low Voltage Differential Signaling (LVDS) Interface Circuits, March, Comment [PK]: Missing reference Issue.0 ()