DSL Cell Site Gateway

• A single box solution connecting several BTSs and Node Bs
• Four E1 ATM UNI, IMA or CES ports
• Up to four 10/100BaseT ports
• Supports four IMA-bonded SHDSL links, four M-pair bonded SHDSL.bis or a single ADSL2+ uplink
• ATM traffic scheduling according to CBR, VBR, UBR and UBR+
• Traffic classification according to 802.1p, IP ToS/DSCP or MPLS EXP bits
• ATM and TDM pseudowire encapsulation over PSN with ATMoPSN, CESoPSN or SAToP
• High precision clock recovery, compliant with ITU G.823/824
• ATM OAM with end-to-end control based on standard I.610 QoS assurance
• Pseudowire OAM based on VCCV-BFD
• ConfiguRAD Web-based element manager
• RADview-EMS element manager, compatible with any third-party NMS/OSS
• Compact, 1U desktop unit

• Provides a cost-effective solution to bandwidth capacity challenges arising from booming 3G traffic volumes and HSDPA service rollouts
• Minimizes CapEx and shortens service rollout times by leveraging widely common xDSL lines and economical packet-switched transport
• Lowers backhaul OpEx by optimizing RAN bandwidth utilization through grooming of underutilized E1 channels and ATM statistical multiplexing
• Simultaneously delivers 2G/3G traffic and supports multi-generation cell site colocation
• Enables maximum operator flexibility with “Any Service Any Port” functionality, fitting various network architectures
• Ensures service reliability and differentiated QoS through traffic classification and shaping
• Supports gradual migration to PSN networks and Fixed and Mobile Convergence (FMC)
• Allows limited space installations with small size and total front access design

RAD’s LA-130 DSL cell-site gateway offers a variety of highly effective solutions for mobile operators and transport providers seeking to reduce backhaul expenses, while successfully meeting soaring bandwidth requirements. Leveraging wholesale SHDSL and ADSL2+ deployments, the LA-130 connects to ATM DSLAMs and IP DSLAMs to enable cost-efficient delivery of GSM, UMTS and bandwidth-intensive services such as HSDPA, over ATM, PSN or hybrid transport networks. The LA-130 DSL cell-site gateway allows simultaneous delivery of real-time and delay-tolerant traffic, enhancing bandwidth utilization by grooming fractional E1/T1 ATM channels, CES E1 TDM channels and Ethernet links onto a single, high-capacity network interface. Operating opposite the ACE-3400 and ACE-3402 – RAD’s aggregation site gateways – it links several GSM BTSs, UMTS Node Bs and IP Node Bs, to their respective BSCs and RNCs.

SHDSL bonding

The LA-130 operates over 4 x 2-wire SHDSL or G.SHDSL.bis lines at a combined data rate of up to 9.2 Mbps or 20 Mbps, respectively. It combines two, three or four pairs into a single data stream using IMA or physical (M-pair) bonding schemes.

Emulated ATM and TDM services over PSN

Service operators rolling out mobile broadband and rich-media services are offered a migration path that allows them to cost effectively transmit large traffic volumes by using economical packet transport, while maintaining real-time performance levels for 2G voice and 3G video services. The LA-130 DSL cell-site gateway supports a flexible variety of backhauling options using a mix of DSL technologies with varying degrees of service reach and bandwidth capacities. One such alternative is a hybrid of ATM and PSN transport, whereby bonded SHDSL lines are used for provisioning high-priority voice and data traffic over ATM or SDH/SONET backbones, while delay-tolerant, newly introduced data applications requiring high download rates, such as HSDPA, are offloaded to packet-switched networks through ADSL2+. Alternatively, operators can converge multi-generation traffic over an all-IP RAN, using ATMoPSN, CESoPSN or SAToP pseudowire encapsulation, with accurate synchronization mechanism for transparent delivery of ATM and legacy TDM traffic over Ethernet, MPLS or IP networks. LA-130’s pseudowire capabilities also include a jitter buffer of up to 60 milliseconds, with 1-millisecond granularity, which compensates for packet delay variations in the network.

Adaptive clock recovery over PSN

The LA-130 supports strict timing requirements for cellular services, in accordance with ITU-T G.823/824 specifications, to provide robust traffic synchronization over packet switched networks. Clock references can be retrieved using either one of two mechanisms, namely NTR (network time reference) synchronization, whereby the cell site gateway retrieves timing data from the DSLAM over the DSL connection, and adaptive clock recovery, in which the clock is recovered from the network via a pseudowire connection. Additional clock sources include the unit’s internal oscillator and the RX (E1) clock signals.

Quality-of-service (QoS)

The LA-130 supports inherent ATM QoS schemes, enabling operators to assign each virtual connection (VC) or virtual path (VP) to a service class and shape egress traffic according to parameters such as CBR, VBR, UBR and UBR+. In addition, it supports pseudowire QoS and Ethernet traffic classification according to 802.1Q, 802.1p, IP ToS/ DSCP or MPLS EXP.