Vanguard Managed Solutions 7300 Series T3/E3 ATM Card, Carrier Expansion Card, Functionality

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)

ATM CBR Station Configuration

• Maximum coaxial cable length of 450 feet

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.

2-28 Vanguard 7300 Enclosures and Components