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Table 2. Supported IP QoS Features
Feature Description
Classification and Marking
• Class-based marking with differentiated services code point (DSCP) (data only)
• Committed access rate (CAR) with DSCP (Ingress-Ethernet/Fast Ethernet; Egress—G.SHDSL)
• Dial-peer DSCP/IP Precedence marking
Queuing and Scheduling
• Class-Based Weighted Fair Queuing (CBWFQ)
• Low Latency Queuing (LLQ)
• Driver per-virtual circuit queuing
Congestion Avoidance
• Class-Based Weighted Random Early Detection (WRED) with DSCP (egress)
Policing and Traffic Shaping
• Class-based policing
• Per-ATM virtual circuit shaping for VBR-nrt
• ATM cell loss priority (CLP) bit marking*
Link Efficiency
• Tunable Tx ring buffer for values 2 through 601
• Multilink PPP (MLPPP) link fragmentation and interleaving (LFI)
• MLPPP with LLQ, CBWFQ, and other QoS features*
• Compressed Real-Time Transport Protocol (cRTP)*
Other (IP QoS)
• Local policy routing (LPR)
• Policy-based routing (PBR)
• IP QoS map to ATM CoS
* Supported in Cisco IOS Software Release 12.3(2)T or later
The G.SHDSL WICs for the Cisco 2800, 3800, 2600XM, 2691, and 3700 provide support for ATM CoS (CBR, VBR-nrt, VBR-rt, and UBR)
features that help service providers manage their core ATM network infrastructures to deliver scalable, cost-effective services with CoS guarantees
to their customers. Permanent-virtual-circuit (PVC) traffic shaping and queuing allow further optimization of the existing bandwidth between
customers and various services.
INTEROPERABILITY
The new interface cards are based on the Conexant chipset (Firmware 3.0.1), and they operate when connected back to back or when connected to a
DSLAM.
Customers can deploy G.SHDSL WICs in a back-to-back configuration to take advantage of existing copper wiring in a building, campus, or
neighborhood where DSLAM aggregation equipment is neither needed nor financially justified. In back-to-back mode, one side of the connection is
configured in central-office mode and provides functions similar those of a DSLAM (Table 3).
Table 3. DSLAM Interoperability
WIC-1SHDSL-V3
(2-wire ATM mode)
WIC-1SHDSL-V3
(4-wire ATM mode)
Alcatel ASAM 7300 (12- and 24-Port Line Cards)
X X
ECI HiFocus SAM 240 (16-Port Metalink-Based Line Cards)
X X
Lucent Stinger FS (32- and 48-Port Line Cards)
X X
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