FEATURES

• S-TAU, Smart Trunk Access Unit, provides direct physical and electrical connection between workstations and the Token Ring network. Functioning as a passive wiring concentrator, S-TAU offers star-shaped ring topology for eight users. For larger networks, several S-TAUs can be linked together by connecting Ring In/Ring Out expansion ports.

• Insert and bypass functions are provided within the unit. Insertion of a workstation into the ring occurs when the workstation's network interface card or adapter provides a DC current across the lobe cable to the lobe port of S-TAU. The station only accesses the ring if the adapter and cable are fully operational.

• Each lobe is equipped with a status LED indicator, indicating that a station is actively inserted into the ring, thus simplifying diagnostics and troubleshooting. Bypassing of a lobe occurs automatically whenever the lobe cable connection is removed or the station becomes inactive or exits the network.

• Several options are available for installation at either the Ring In (RI) or the Ring Out (RO) ports. These include:
   
  • TFCs, Fiber Optic Converters, which allow fiber connection between adjacent S-TAUs, or enable lobe connection of S-TAU using fiber.
  • TFRs, Fiber Optic Repeaters, which extend the distance between adjacent S-TAUs to 3 km.
  • TCRs, Copper Repeaters, which extend the distance between adjacent S-TAUs to 750m on Type 1 cable.

• S-TAU operates without external power. However, an external power supply is required for each RI or RO option above (see Ordering).

• S-TAU is installed in a 19" rack mount enclosure. The unit height is only 1U (1.75"), requiring minimal rack space.

• The standard S-TAU is provided with IBM data connectors for use in an IBM cabling environment. Optionally, RJ-45 connectors can be supplied, for connection of Unshielded Twisted Pair (UTP), while retaining the self-shorting (bypass) feature.

• To ensure proper operation of S-TAU, a TST pre-installation setup tool should be used. This small universal tool should be ordered separately.

SPECIFICATIONS 

• Compatible with IBM Token Ring at 4 or 16 Mbps
• Complies with IEEE 802.5 standard
• No external power required
• Lobe insertion LEDs
• Supports 8 workstations
• Optional built-in repeaters
• 1U height for minimal rack space
• RJ-45 or IBM data connectors

S-TAU/+/$/&
Trunk Access Unit

Note: All RI/RO options require PS-115/7.5/800 or PS-230/7.5/800 power supply.
 

ACCESSORIES
PS-115/7.5/800

115 VAC power supply (for all RI/RO options)

PS-230/7.5/800
230 VAC power supply (for all RI/RO options)

TST
Pre-installation Setup Tool

TST/RJ-45
Pre-installation Setup Tool for S-TAU with adapter cable for RJ-45 connectors

Note: One TST tool may be used for any number of S-TAUs.
 

MF-3
Type-3 Media Filter

ORDERING

S-TAU
S-TAU/RJ

APPLICATIONS