accessgate - · pdf filethe performance leader in ran optimization solutions ... required to...

AccessGateThe performance leader in RAN optimization solutions

AccessGate SystemsAccessGate RAN optimizers are deployed in pairs: one typically located at either a base transceiver station (BTS) or Node B cellular site, and the other located at the base station controller (BSC) or radio network controller (RNC) switching office. Each AccessGate optimizer terminates Abis and/or Iub backhaul circuits at their respective locations, and then performs an advanced, patented series of optimization techniques to reduce the bandwidth required to transport both 2G and 3G mobile voice and data traffic over the wide area — all without degrading performance or compromising voice quality.

Cell Site SystemThe AccessGate system located at the cell site (typically an AccessGate model 2004 or 2008) is a small, cost-effective device specifically designed to optimize the bandwidth utilization of GSM and UMTS mobile cell site traffic. AccessGate aggregates and multiplexes mobile traffic from multiple 2G-, 2.5G-, 3G-, and IP-based cell site services onto a common, packet-switched narrowband or IP/Ethernet backhaul to a corresponding peer system at the Mobile Switching Center (MSC), and performs the reverse operation for traffic coming back from the MSC to the cell site. AccessGate’s

GSM and UMTS “compression” techniques enable mobile operators to transmit traffic over reduced backhaul bandwidth, thereby minimizing recurring operating expenses. Alternatively, the freed up backhaul bandwidth can be used to accommodate the growth of new subscribers or the rollout of new cell sites and services without incurring additional infrastructure investments. Plus, when new 3G- or IP-based services are installed at the cell site, the AccessGate’s Iub and Ethernet interfaces enable the operator to support this new traffic without the addition of separate, dedicated backhaul, delaying — or in some cases eliminating — the need for deploying additional costly leased bandwidth.

Mobile Switching Center SystemThe AccessGate model 2016 is designed for deployment at the MSC. It’s a carrier-class platform that terminates backhaul connections from multiple AccessGate cell site devices. The MSC-based AccessGate systems process traffic from each cell site to reconstruct frames and channels. The original frame is then delivered to the GSM BSC and, where applicable, to the UMTS RNC. In this way, AccessGate appears transparent to the operation of the underlying BSS (base station subsystem) RAN equipment.

NMS Communications’ AccessGate™ is a family of award-winning radio access network (RAN) optimization systems that reduces operating costs and enables the rapid expansion and migration of mobile wireless networks. Mobile operators around the world have deployed AccessGate solutions to address numerous business and technical challenges in their GSM networks, while setting the stage for a smooth transition to 2G/3G converged networks, as well as the adoption of IP-based RAN backhaul. AccessGate employs a unique, patented set of aggregation and bandwidth optimization techniques that enable wireless operators to maximize network utilization, resulting in a significant reduction in recurring leased line and VSAT satellite backhaul expenses, which typically represent 30% of total network operating costs.

• Vendor-independent, multi-service, multi-protocol RAN aggregation plus optimization

• Industry-leading optimization performance with the lowest latency

• Patented deep packet inspection RAN optimization technology

• Proven interoperability with all major base station subsystem and VSAT modem vendors

• Extensive worldwide field-proven operational deployments

• Functional over a wide range of environmental operating conditions

• Lowest cost of ownership

AccessGate Highlights

AccessGate 2016

• Network interfaces: Supports Abis and Ater interfaces for 2G/2.5G voice and data (GPRS/EDGE) services, as well as Iub and Ethernet interfaces for 3G services; enables cost-effective GSM-to-UMTS evolution

• Statistical multiplexing: Aggregates and optimizes GSM Abis and UMTS Iub communications onto a common backhaul between the cell site and mobile switching center

• Silence and idle frame removal: Suppresses silence and idle frames for 2G services; eliminates ATM idle cells and compresses ATM headers for 3G services; saves bandwidth by only transmitting what the receiving end can’t recreate

• Bandwidth savings: Delivers backhaul bandwidth savings of 50% to 70%; reduces OpEx and improves profitability

• Backhaul media: Multi-service, multi-protocol support over terrestrial leased

lines, VSAT satellite services, microwave links, and broadband IP/Ethernet services

• OAM: Offers simplified management and provisioning; allows integration into third-party management systems via an SNMP MIB

• High availability: Achieves “five nines” reliability for carrier-grade deployment; redundant configurations available for added assurance

PSTN/PDN

Remote SwitchingCenter

Mobile SwitchingCenter

Cell Site

UMTS RNC

GSM BSCAbis overE1/T1

Iub overIMA/E1/T1

AbisInterfaces

IubInterface

AccessGate AccessGate

AccessGate

OptimizedAbis and Iub

Backhaul overTDM or IP

2G GSMBTS

3G UMTSNode B

AterInterfaces

Iu Interface

OptimizedAter Backhaul

MSC

TRAU

AccessGate

AterInterfaces

A In

terfa

ces

E Interface

How AccessGate WorksAt the heart of all AccessGate RAN optimizers lies a set of media processing and statistical multiplexing algorithms developed and patented by NMS, based on over twenty years of experience at the forefront of network communications technology. These algorithms detect the payload types of the mobile traffic, and then operate on the various payload types with differentiated bandwidth reduction techniques specific to each type. Most importantly, these bandwidth reduction techniques do not compromise the original performance or quality of the traffic — whether it’s voice, data, or video. AccessGate is the only multi-service, multi-protocol, and vendor-independent solution on the market to utilize patented deep packet inspection technology, specifically designed for the aggregation and optimization of RAN backhaul traffic.

AccessGate optimizes mobile network backhaul by eliminating redundant silence and idle frames — resulting in bandwidth reductions of up to 50% — and even higher in some circumstances. AccessGate can also aggregate GSM, UMTS, CDMA, TDMA, and IP traffic onto the same backhaul, eliminating the need for deploying and maintaining separate 2G and 3G networks. Unlike other competitive look-alike products, AccessGate is unique in its ability to optimize RAN backhaul without degradation of either network performance or voice quality. It introduces a constant, imperceptible delay of only 10-15 msec, and does so without vocoding and without compression, delivering a rapid payback and positive cash flow for mobile operators. In many cases, an AccessGate investment pays for itself in a matter of months, providing immediate performance benefits and cost relief that help drive more business.

Converged 2G GSM and 3G UMTS Aggregation and Optimization

Features of AccessGate Systems

Cell Site

Mobile Switching Center UMTS RNC

GSM BSC

Abis overE1/T1

Iub overIMA/E1/T1

AbisInterfaces

IubInterfaces

2G GSMBTS

3G UMTSNode B

Optimized Abis andIub Backhauled over

Satellite-Based IP

AccessGate

BTS

OptimizedBackhaul over IP/Ethernet

Abisover E1/T1

2G GSMAccessGate

IP-EnabledVSAT Hub


AccessGateBTS

Abisover E1/T1

2G GSM IP-EnabledVSAT

IP-EnabledVSAT

Cell Site


AccessGateIP-Enabled

VSAT

Cell Site

GSM and UMTS Optimization on an SCPC VSAT Network

Enhanced Provisioning and ManagementAccessView, the entry-level AccessGate management system, consists of an SNMP client application that supports remote configuration, monitoring, and verification of individual AccessGate devices via an SNMP agent. AccessView is a multi-platform application that can be executed from laptops and workstations with network access to the LAN on which the MSC AccessGate systems are deployed. AccessView can be launched as a native application, or integrated with either HP OpenView or with the operator’s operation and support system (OSS) using its embedded SNMP agent. AccessView’s main functionality includes the ability to:

• Configure and view system, trunk, timeslot, and sub-channel parameters

• Remotely upgrade system software

• Acknowledge and delete system alarms

• Monitor and view charted data for key performance indicators

• Connect with an external management framework by managing the SNMP client’s access to system parameters and configuring trap destinations (for example, the IP address to which alarms will be sent)

For more advanced and/or extensive AccessGate implementations, AccessEMS represents a turnkey client/server-based element management system designed to manage an entire network of AccessGate systems. With the AccessEMS system, mobile operators can manage all fault, configuration, performance, and security aspects of an AccessGate network. AccessEMS incorporates the full functionality of AccessView, and, in addition, provides the following features and functions:

• Configuration management, including auto-discovery, inventory archiving, configuration monitoring/tracking, and software distribution

• Fault management, including monitoring/polling, alarm management, notification, and integration with third-party management platforms

• Performance management, including the collection, aggregation, and reporting of element-level performance statistics

• Security management, including support for a variety of access levels by operational role

Application ScenarioAccessGate Optimization of VSAT-Based IP Backhaul

The emerging markets continue to experience phenomenal growth rates of mobile subscriber adoption. Mobile operators in these markets are frequently challenged to deliver cost-effective growth and expansion of their network infrastructure to outlying population centers in order to accommodate that subscriber growth. However, in many instances, traditional terrestrial backhaul bandwidth solutions are both scarce and costly. As a result, VSAT (very small aperture terminal) technology has gained great favor as the backhaul medium of choice among operators driven to satisfy time-to-market and subscriber coverage objectives.

By providing an IP/Ethernet backhaul interface, AccessGate enables mobile operators to reduce the recurring cost of leased VSAT bandwidth with a rapid payback period, typically yielding a 3–6 month ROI. AccessGate is interoperable with all of the most popular SCPC (single

channel per carrier) and IP/Ethernet VSAT modems, reducing overall VSAT bandwidth costs by 50% or more.

New approaches to VSAT transmission technology are emerging in the RAN, promising better bandwidth savings and faster payback periods on the transmission network than conventional SCPC technology. Technologies such as Time Division Multiple Access (TDMA), Bandwidth on Demand (BoD), and Demand Assigned Multiple Access (DAMA) allow VSAT bandwidth resources to be shared among a hub location and multiple remote cell site locations. This is particularly advantageous for low TRX cell sites. With an IP/Ethernet backhaul interface and support for features such as RTP and/or UDP, dynamic jitter buffer, and QoS on GSM traffic using DiffServ, AccessGate interoperates seamlessly with IP-enabled VSAT equipment, allowing for maximum optimization and efficiency — as well as minimized cost — of shared VSAT bandwidth.

NMS Communications 100 Crossing Boulevard Framingham, MA 01702-5406 Tel: +1 508 271 1000 Tel: +1 800 533 6120 Fax: +1 508 271 1300 Email: [email protected]

200 Brook Drive Green Park Reading, Berkshire RG2 6UB United Kingdom Tel: +44 (0) 118 949 7040 Fax: +44 (0) 118 949 7042 Email: [email protected]

1815–16 Concordia Plaza 1 Science Museum Road Tsim Sha Tsui East Kowloon, Hong Kong Tel: +852 2926 1820 Fax: +852 2620 5600 Email: [email protected]

NMS also has offices throughout North America, Europe, and Asia. Visit www.nmscommunications.com for a complete listing.

Every effort has been made to ensure the accuracy of this document. However, due to the ongoing improvements and revisions to our products, NMS Communications cannot guarantee the accuracy of the material after the

date of publication, or accept responsibility for errors or omissions. Revised documents may be published when deemed necessary by NMS Communications. For the latest information about AccessGate, refer to our web site at

www.nmscommunications.com.

NMS, NMS Communications, and AccessGate are trademarks of NMS Communications Corporation. All other product or corporate references may be trademarks or registered trademarks of their respective companies. 1/07

Technical SpecificationsInterfaces

• Up to 4 E1/T1 interfaces (AccessGate 2004)



• Two 10/100 Base-T Ethernet interfaces on all models for IP backhaul, IP services, or management

• Trunk and bearer interfaces: TDM over E1/T1 for Abis, narrowband ATM/IMA for Iub

• BTS/BSC interface compliant with GSM Abis standard

• Node B/RNC interface compliant with UMTS Iub standard

• Craft port: serial RS-232C (DB9) accessible on front or rear of all models

• CEPT E1 G.703 Telephony Interface

- Interface: G.703 2.048 Mbps trunk interface (software selectable 75 and 120 ohm impedance)

- Framing: CEPT G.703/G.704

- Line code: HDB3

- Alarm signal capabilities: RAI, AIS, CRC4-multi frame alarms

- Counts: bit error rate, CRC errors, slips, line code violations, far-end block errors

• T1 (DSX-1) Telephony Interface

- Interface: ANSI T1.102, T1.403

- Framing: ESF, D4

- Line code: B8ZS

- Zero bit suppression: selectable B8ZS, no zero code suppression

- Alarm signal capabilities: RAI, LOS/LOF, and AIS

- Counts: bipolar violation, F(t) error, and CRC error

I/O Configurations

• AccessGate 2004

- Up to 2:1 E1/T1 service:backhaul trunks, 4 x RJ48C

- Up to 2:2 E1/T1 service:backhaul trunks for redundant configurations

- Up to 2 E1/T1 service trunks supported over IP/Ethernet backhaul

• AccessGate 2008




• AccessGate 2016




Alarms

• 1 audible / 3 visual alarms on all models (except AccessGate 2004), 2 x DB9M, dry relay contacts

• Individual alarm trunk LED on the service side and 1 multiplexed alarm trunk LED on the non-service side

• Ethernet status indicator on both sides

• Key system status indicator on both sides: FAULT/BYPASS/OK/TRUNK

Bandwidth Savings

• Up to 70% bandwidth improvement on Abis and Ater interfaces

• Elimination of unused DS0s

• Removal of silence frames from voice

• Removal of idle frames from packet data

• Removal of idle frames from on-hook channels

• Removal of idle pattern from LAPD channels

• Statistical multiplexing of Abis and Iub traffic

• Automatic detection of all Abis and Ater protocols

Latency

• 10-15 ms fixed latency, end-to-end, for both Abis and Iub

Management

• SNMP v2c

• RFC 1213 (MIB-II)

• RFC 3415 (View-Based Access Control Model)

• Telcordia GR-474 (Alarm Surveillance and Control for Network Elements)

• ITU X.733 (Alarm Formatting)

• Accessible locally via laptop using craft port

• Remotely accessible using network management interface required by customer

- Initialization

- Configuration

- Alarms: major, minor

• E1/T1 performance monitoring

• Self-diagnostic and fault isolation mechanisms

• Remote monitoring

• Usage report

• Graphical rendering of key performance indicators

Availability

• 99.999% availability with trunk relay bypass

- In case of failure, no compression is performed on Abis trunks, and Iub trunks operate in pass-through mode.

• Live/remote software upgradeable

Physical Description

• 1U chassis

• Height: 44mm, Width: 483mm, Depth: 280mm

• Weight: 4 kg

• Universally mountable for front or rear I/O configurations

Power Requirements

• Input voltage: 24/-48V (18 to 60 VDC range)

• Power consumption

- AccessGate 2004: 12.5 Watts (typical) to 25 Watts (maximum)

- AccessGate 2008: 20 Watts (typical) to 40 Watts (maximum)

- AccessGate 2016: 25 Watts (typical) to 50 Watts (maximum)

• Redundant DC power feed support

Environmental

• Conforms to Directive 2002/95/EC (RoHS)

• Normal operating temperature: -10°C to +65°C

• Storage temperature: -25°C to +70°C

• Relative humidity: 5% to 90% (non-condensing)

• Maximum operating altitude: 3,400 m

Approvals

• Digital multiplexer requirements and objectives: AT&T publication 43802, July 1982

• Service description and interface specifications: AT&T TR 62411, ACCUNET T1.5

• Carrier to customer installation DS1 metallic interface: ANSI T1E1/88-001R1, February 1988

• ETSI Compliance

- Equipment Engineering (EE): environmental conditions and environmental tests, ETS 300 019-1-3

- Storage: ETS 300 019-1-1, for Class 1.2 equipment

- Transportation: ETS 300 019-1-2, for Class 2.3 equipment

• Safety

- U.S.: UL 60950-1 (1st Edition)

- Canada: CAN/CSA-C22.2 No. 60950-1-03

- EU: EN60950-1:2001

• EMC

- U.S.: FCC Part 15, Subpart B, Class A

- Canada: ICES-003, Class A

- EU: CE Mark

- Emissions: EN55022:1998 A1:2000 A2:2003 Class A

- Immunity: EN50024:1998 A1:2001 A2:2003

• Telecom

- U.S.: FCC Part 68 and TIA-968-A

- Canada: IC-CS03

- EU: TBR12/A1, TBR13, G.703 (10/98) and G.704 (10/98) for both 75 ohms and 120 ohms

accessgate - · pdf filethe performance leader in ran optimization solutions ... required to...

Documents