3com TR ユーザーズマニュアル

C

HAPTER

 1: O

VERVIEW

■

Port population—High density port population 
relieves traffic congestion and supports 4 and 16 
Mbps data rates. In addition, the Switch 2000 TR 
has four custom-configurable ports designed for 
direct workstation or dedicated server connection.

■

Network management—Switch 2000 TR is sup-
ported by the Transcend

®

 Enterprise Manager 

applications for UNIX and Microsoft Windows 
95

®

. Both network management applications pro-

vide Simple Network Management Protocol 
Remote Monitoring Management Information 
Base (SNMP RMON MIB) data using an intuitive 
graphical interface to report historical and perfor-
mance statistics.

■

Congestion Control—The Congestion Control 
feature optimizes available buffer space in the 
Switch 2000 TR by using the buffering ability in all 
Token Ring end stations. This is especially useful 
when many ports are transmitting to a common 
port such as a server connection. Having conges-
tion control eliminates the chances of dropped 
packets in high-traffic client-server environments.

■

Slide-in Option Slot—Optional downlink mod-
ules are available for the Switch 2000 TR. These 
modules provide downlinks to high-speed back-
bones such as FDDI, ATM, and Fast Ethernet. 

■

The FDDI module supplies a 100 Mbps point of 
aggregation for multiple Token Ring switched 
segments and supports either Single Attached 
Stations (SAS) or Dual Attached Stations (DAS).

■

The ATM module supplies 155 Mbps UNI inter-
face, and retains all virtual LAN emulation con-
figuration data, provides ATM signaling, and 
offers standard LAN emulation.

■

The TR-in-FE module combines Token Ring and 
Ethernet for the purpose of utilizing Fast Ether-
net as a backbone and method of server attach-
ment for Token Ring networks. Through a 
process known as tunneling or encapsula-
tion, TR-in-FE uses Fast Ethernet to transport 
natively formatted Token Ring frames. 

■

High-speed Cascade Interface—The high-speed 
cascade interface enables multiple Switch 2000 
TRs to connect to form a single, large switched 
domain while reducing the cost typically incurred 
with FDDI or ATM functionality. This connection 
allows as many as six Switch 2000 TRs to be 
stacked.

■

VLAN Support—The Switch 2000 TR supports vir-
tual LAN (VLAN) operation by allowing any switch 
port to become a member of any one of 15 unique 
VLANs (workgroups). By establishing VLANs, LAN 
administration tasks such as adds, moves, and 
changes become easier while bulk downloads and 
configurations remain across workgroups. VLANs 
also enhance security and increase network effi-
ciency by controlling traffic flow and containing 
broadcasts. VLANs are preserved over the High 
Speed Cascade Interface. In addition, indus-
try-standard LAN emulation over ATM provides a 
method for creating enterprise-wide virtual LANs 
that reflect how networks actually function.