V4.1 BSTU4 Features and Applications Copyright © Siemens Schweiz AG 2007

Target for BSTU4 features Extend and optimize the features of 4 port layer 2 switch compared with STU4 according to the demands and needs of ULAF+ customers Enable the flexible application for various Ethernet services without external switch Enable the realization of Ethernet services via TDM and packet data backbone networks with state-of-the-art configuration and maintenance using QoS and CoS according to IEEE standards

BSTU4: New features compared with STU4 VLAN Support (up to 16 VLANs) VLAN Termination + Q-in-Q QoS Integrated into ULAF+V5.0 STU4 4 ports L2 switch VLAN transparent Link aggregation 4, 8 or 16 wire pairs scalable Embedded Clock Operation Support of BSRU Port prioritization BSTU4

Individually configurable BSTU4: 4 port L2-switch Individually configurable 10/100BaseTX ports IEEE 802.3u (using LCT or AccessIntegrator EM ULAF+) Plug-in: 3 ports at the front and one connected to the backplane of ULAF+ V5.0 subrack Desktop: 4 ports Ports can be individually deactivated to save power in remote powered locations 10BaseT/100BaseTX Full- / half duplex operation; Auto negotiating Link Failure Propagation (LFP) Flow control (pause frames or back pressure) Automatic MDI / MDI-X crossover VLAN and QoS supported Handling of oversized frames up to 2000 bytes Link Aggregation (IEEE 802.3ad) Self-learning switch (1024 MAC addresses Ingress Rate Limiting Broadcast Storm Protection VLAN IEEE 802.1Q support Provider VLAN IEEE 802.1ad 16 simultaneous active VLAN

Priority Queues Quality of Service 4 priority queues Transmit Queue Algorithms : “Weighted Fairness Queuing” (WFQ) “Strict Priority Queuing” (SP) Prioritization Based on port Based on IEEE 802.1p Based on DSCP Based on VLAN ID 5

Applications (1): STU4 versus BSTU4 C-VLAN C-VLAN SHDSL or network connections BSTU4 BSTU4 C-VLAN C-VLAN QoS -- Based on port - Based on IEEE 802.1p -- Based on DSCP -- Based on VLAN ID : External switch C-VLAN: Customer Virtual LAN 6

Applications (2): Point-to-point connections 10/100BaseTx 10/100BaseTx C-VLAN A C-VLAN A BSTU4 BSTU4 SHDSL via 1…4 wire pairs C-VLAN B C-VLAN B VoIP -Classify ingress frames (QoS) based on Port / 802.1p / DSCP/VLAN Limit bandwidth VoIP 7

Applications (3): Connections via TDM based backbone network C-VLAN A C-VLAN A BSTU4 TDM Network BSTU4 QSTU QSTU C-VLAN B C-LAN B VoIP -Classify ingress frames (QoS) based on Port / 802.1p / DSCP/VLAN Limit bandwidth VoIP 8

Applications (4): Connections via Metro Ethernet Network C-VLAN A ULAF+ V5 subrack C-LAN B BSTU4 10/100BaseTx C-VLAN A GbE VoIP BSTU4 Metro Ethernet Network BSTU4 C-VLAN A C-VLAN B BSTU4 BSTU4 P-VLAN (Provider VLAN) C-LAN B VoIP P-VLAN Termination Points -Add P-VLAN ID -Classify ingress frames (QoS) - Limit bandwidth VoIP 9

BSTU4 plug-in version with direct access to backplane of ULAF+ V5.0 Integration in ULAF+ V5 BSTU4 plug-in version with direct access to backplane of ULAF+ V5.0 subrack (S3105-B628-A210) No Ethernet cabling necessary 10

Applications in ULAF+ V5 using BSTU4 plug-in C-VLAN A Packet Network GbE uplink (optical or copper) ULAF+ V5 subrack* BSTU4 WAN BSTU4 plug-in BSTU4 plug-in C-VLAN B *S3105-B628-A210 11

MCS Comparison with another copper bonding schemes *) Not yet implemented in ULAF+ systems. Can be implemented on customer request.

MCS Multi Channel Synchronisation Bundling of 2..4 channels over transparent or structured TDM networks Resiliency Independent Rx- and Tx- data streams Network delta delay compensation Minimised additional delay caused by MCS (< 100µs) Autonomous detection and correction of wire pair or channel interchange Proprietary and patented inverse multiplexing algorithm

Embedded clock operation BSTU desktop units are equipped with 2,048MHz clock input/output interface (BNC 75 Ohm). High quality clock can be provided to the remote location usnig synchronous SHDSL transmission. ULAF+ subrack 2,048MHz clock input e.g.from SDH Mobile network BTS / NodeB BSTU4 (RT) SHDSL via 1…4 wire pairs Timing output BSTU4 COT 2,048MHz clock input BSTU4 (RT) SHDSL via 1…4 wire pairs Timing output BSTU4 (COT)

BSTU4 scalability 2x 4 wire pairs with Link Aggregation, up to 45,6Mbit/s BSTU4 BSRU BSRU BSTU4 LT NT 1 1 P1 2 2 P1 1 1 P2 2 2 P2 LT NT 1 1 P1 2 2 P1 1 1 2 2 1... …4

BSTU4 DSLAM Backhaul with Link Aggregation Σ=91,2Mbit/s e.g. DSLAM BSTU4 BSTU4 22.8MBit/s BSTU4 BSTU4 22.8MBit/s Incoming Packets with different MAC addresses BSTU4 BSTU4 22.8MBit/s BSTU4 BSTU4 Metro Ethernet Network 22.8MBit/s Link Aggregation (IEEE 802.3ad) Ethernet Frames are distributed among different links (based on MAC-Addresses) Up to 91,2Mbit/s over up to 16 wire pairs can be aggregated Easy to set-up and configure with Ulaf+ LCT or AccessIntegrator

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