Alcatel-Lucent 1850 TSS-5 supports the following Quality of Service (QoS) capabilities:
Private Line service provides dedicated bandwidth between two end points (best QoS).
Fractional rate services provide basic rate shaping with approximately 50 Mb/s or 1.5 Mb/s granularity.
Class of Service scheduling and queuing
The VLNC35 circuit packs provide 10 Mb/s and 100 Mb/s Private Line services. They do not contain an Ethernet Switch. Each LAN port is connected to its own VCG. 100 Mb/s traffic can be rate-limited by provisioning less SONET/SDH bandwidth than required to carry the full line rate. Traffic is buffered and flow control is invoked when ingress traffic on a LAN port exceeds the VCG's SONET/SDH bandwidth. If flow control is disabled or ignored by the external equipment, Ethernet frames are dropped when the ingress buffer overflows.
The VLNC40/42/42B contains an Ethernet Switch that can switch traffic over Gigabit Ethernet links into the EATN. 100 Mb/s traffic can be rate-limited by provisioning. Up to 8 classes of service are supported, using class-based queuing with Weighted Random Early Detection (WRED) with tail-drop, and scheduling using Static Priority, Weighted Round Robin (WRR), and Weighted Fair Queuing (WFQ).
The VLNC50/52/55 circuit pack provides partial-rate GbE Private Line services over SONET/SDH. Each VLNC50/52/55 LAN port is connected to its own VCG. Traffic is buffered and flow control is invoked when ingress traffic on a LAN port exceeds the VCGs bandwidth. If flow control is disabled or ignored by the external equipment, Ethernet frames are dropped when the ingress buffer overflows.
| Copyright © 2011 Alcatel-Lucent. All rights reserved. |