Cisco MGX 8850 AXSM Broadband ATM Switching Module
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Key Features
• AXSM can be used in the MGX 8850 to provide ATM capability up to OC-48c/STM-16.
• High scalability in interface speeds with T3/E3 ports, OC-3c/STM-1, OC-12c/STM-4, and OC-48c/ STM-16 AXSM modules. Each port on the AXSM can be configured for either trunk or access applications.
• Industry leading module port densities of 16 T3/E3 ports, 16 OC-3c/STM-1 ports, 4 OC-12c/STM-4 ports, and 1 OC-48c/ STM-16 port that can scale up to 12 OC-48c/STM-16 modules in each MGX 8850 Multiservice Switch. Each OC-48c/STM-16 delivers fully nonblocking, full duplex throughput, in which a connection can occupy the entire line rate.
• Support for all ATM service classes, with up to 16 classes of service (CoS). Supports carrier-class implementation of standards-based PNNI, SVC/SVP, SPVC/SPVP, and MPLS services.
• Large cell buffers (one million cells), which help to maximize "goodput" performance during congestion, reducing the number of retransmits; the buffers are allocated dynamically, depending on connection resource needs, thereby optimizing use of system resources.
• High reliability with hot-standby 1:1 AXSM card redundancy, 1:1 and 1+1 line redundancy using APS.
Figure 1. Cisco MGX 8850 AXSM Broadband ATM Switching Module
Technical Specifications
Physical-Layer Interface
T3/E3
• Ports and trunks supported on same AXSM module
• User-Network Interface (UNI) Specifications 3.0, 3.1, 4.0
Table 1. AXSM T3/E3 Module
OC-3c/STM-1
• Ports and trunks supported on same AXSM module
• UNI Specifications 3.0, 3.1, 4.0
• Compliant with SONET standards
• Bellcore GR-253-CORE
• ANSI T1.105
• Compliant with SDH standards
• ITU-T G.707, G.708, G.709
• ITU-T G.957, G.958
Table 2. AXSM OC-3c/STM-1 Module
OC-12c/STM-4
• Ports and trunks supported on same AXSM module
• UNI Specifications 3.0, 3.1, 4.0
• Compliant with SONET standards
– Bellcore GR-253-CORE, TR-TSY-000020
– ANSI T1.105
• Compliant with SDH standards
– ITU-T G.707, G.708, G.709
– ITU-T G.957, G.958
Table 3. AXSM OC-12c/STM-4 Module
OC-48c/STM-16
• Ports and trunks supported on same AXSM module
• UNI Specifications 3.0, 3.1, 4.0
• Compliant with SONET standards
– Bellcore GR-253-CORE
– ANSI T1.105
• Compliant with SDH standards
– ITU-T G.707, G.708, G.709
– ITU-T G.957, G.958
Table 4. AXSM OC-48c/STM-16 Module
Network Synchronization
• Can be configured for internal timing from the internal PXM Stratum 3 clock
• System clock synchronization to any service module port
• T1/E1 BITS synchronization port
ATM Layer
• Configurable for trunk, NNI or UNI application
• Conformant to ATM Forum UNI 3.0, 3.1 specification, ITU-T I.361 and I.432 specifications
• Supports up to 16 CoSs and includes all ATM Forum traffic type services: ABR, UBR, VBR-nrt, VBR-rt, CBR; ABR supported for EFCI, RM marking and explicit ER stamping;
• Support for IP quality of service based on Diffserv
• Support for ILMI 4.0
• Complies with standard usage parameter control (UPC) per ATM Forum UNI 3.x, TM 4.0, and ITU-T I.371
• Support for early packet discard (EPD) and partial packet discard (PPD)
• Support for virtual circuit connections (VCCs) and virtual path connections (VPCs)
• Support for up to 128,000 connections per AXSM module controlled by PNNI
• Virtual path identifier (VPI) and virtual circuit identifier (VCI) range for VCCs and VPCs per UNI 3.1
• Support for virtual circuit (VC) merge and multipoint connections
Virtual Trunks
• Supports maximum of 64 virtual interfaces per module; the interfaces can be ports, trunks, or virtual trunks; each virtual interface supports 16 CoS queues
Cell Buffering
• Supports one million cells of buffering to accommodate large traffic bursts, avoid network congestion, and cell discard; suitable for TCP/IP traffic
Support for Dynamic Routing Using PNNI 1.0
• Offers automatic end-to-end connection management mechanism
• Deterministically allocates bandwidth and reroutes connections autonomously over optimum network paths
• Preserves service integrity during network failure
• Offers E.164/NSAP addressing
• Offers support for SVC/SVP, SPVC/SPVP, MPLS link-state packets (LSPs)
• Offers QoS-based routing
Enhanced Call Admission Control
• A user-programmable enhanced connection-admission control (E-CAC) feature decides whether to admit or deny connections based upon the requested quality of service
Statistics
• Statistics supported using user-configurable bucket intervals
• Billing statistics supported on T3/E3, OC-3c/STM-1, and OC-12c/STM-4 interfaces
• Diagnostic statistics available per interface, CoS queues, and connections
OAM
• F4 to F5 fault propagation
• Inband diagnostics support using loopback cells
• Inband continuity check and automatic fault reporting for PVCs
• Loopback facility supported for diagnostics and self-test purposes
Network Management
• Management using Cisco WAN Manager software suite
• Based on Simple Network Management Protocol (SNMP)
Reliability
• Greater than 75,000 hours MTBF
Physical Specifications
• Dimensions: (H x D) 15.83 x 15.65 in.
Electrical Specifications
• Input power required: -48 VDC
• Power consumption: 95W
Electrical and Safety Standards Compliance
• EMI/ESD compliance
– FCC Part 15
– Bellcore GR1089-CORE
– IEC 801-2
– EN55022
• Safety compliance
– EN 60950
– UL 1950
• Bellcore NEBS: Level 3 compliant
• Optical safety: IEC 825-1 (Class 1)
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