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2-28 Vanguard 7300 Enclosures and Components
Vanguard 7300 Cards
T3/E3 ATM Card
Introduction The T3/E3 ATM Card is a Compact PCI card that provides an intelligent connection
between the ATM layer and the T3/E3 physical data port.
Functionality The T3/E3 ATM Card functionality is provided by a two-part card that occupies a
single Vanguard 7300 chassis slot: a standard Carrier Expansion Card with the PMC
mounted, and the T3/E3 Rear Transition Module.
The T3/E3 ATM Card supports:
• Standard T3/E3 physical interface with the T3/E3 Rear Transition Module
installed
• Non-channelized, T3/E3
• Supports both T3 (up to 44.736 Mbps) and E3 interfaces (up to 34.368 Mbps)
• ATM User to Network Interface (UNI) version 3.1 with the ATM PMC
installed
• ATM Adaptation Layer 5 (AAL5)
• Constant Bit Rate (CBR)
• Unspecified Bit Rate (UBR)
• Variable Bit Rate (VBR - real time and non-real time)
• FRF.8 Transparent Mode
• Annex G Termination
• SNMP Agent
• Internal and external clocking
• Permanent Virtual Circuits (PVC)
• Up to 4000 Virtual Channel Connections (VCC)
• Maximum coaxial cable length of 450 feet
ATM CBR Station
Configuration
Occasionally Constant Bit Rate ATM stations can become deactivated. (The total
aggregate PCR does not exceed the link speed.) This occurs because the CBR
scheduling is very rigid and has to fit into the transmit scheduling table in a certain
way. Even though it appears that bandwidth is available, if it does not fit in the
scheduling table, the station is not created. To increase the chances of fitting into the
scheduling table, the larger CBR entries (PCR rate) should be created first. Use VBR
stations instead.
Carrier Expansion Card
The Carrier Expansion Card provides an interface:
• between the PMC Segmentation And Reassembly (SAR) module and T3/E3
Rear Transition Module and
• between the SAR module and host
This Card supports one slot (Slot 1) for the T3/E3 ATM PMC.