1
INTRODUCTION
This chapter describes the hardware and software features
of the 3Com
®
3C975 ATMLink
™
155 PCI network interface
card (NIC), hereafter called the 3C975 ATMLink NIC.
Product Features
The 3Com ATMLink 3C975 NIC is available in two models:
the 3C975-F and the 3C975-UTP. The 3C975-F NIC has an
SC duplex fiber-optic cable connector for double-strand
62.5/125 µm multimode fiber-optic cable. The 3C975-UTP NIC
has an RJ-45 connector and requires Category 5 unshielded
twisted-pair cable. Both 3C975 ATMLink NICs are high-
performance single-slot, bus master, half-length PCI cards that
provide 155.52 megabit per second (Mbps) SONET (STS-3c)
physical layer support.
The 3C975 ATMLink NICs support the following features:
■ ATM Forum standard LAN Emulation Client (LEC)
■ ATM Forum AAL5 ATM adaptation layer
■ ATM Forum UNI 3.0/3.1 standard signaling for switched
virtual circuit (SVC) connections
■ Up to 4 NICs per system
■ Up to 16 emulated LANs (ELANs) per NIC
■ Up to 512 active connections per NIC
■ Up to 4,096 open and 1,024 simultaneously active virtual
channel connections per system
■ Resilient Server Link capability to protect against link failure
■ Compliance with PCI Local Bus Specification, revision 2.0
■ Link LED to indicate connection status
