RAD TRE16-1, TRE16-8 Single Link Token Ring Remote Access Routers 

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RAD TRE16-1, TRE16-8 Single Link Token Ring Remote Access Routers 


  • The TRE Family is part of the LAN RANger Series of Token Ring Remote Access Routers.
  • The TRE Family supports remote access routing and bridging for connecting remote PCs or LANs to a central LAN over a wide variety of WAN interfaces and services, including ISDN, Frame Relay and dial-up modems.
  • Routing and bridging are performed on a link-by-link basis. There are no bridging or routing limitations on the central LAN. However, additional bridges should not be connected to the remote LAN.
  • Transparent remote-to-remote forwarding enables direct data transfer between links whether the links are of bridge or router type.
  • IP can be routed over PPP, SLIP or CSLIP; IPX can be routed over PPP.
  • Bridge links are transparent to Layer 3 protocols, such as NetBIOS and DECNET.
  • Router links can operate opposite any PPP standard compliant device, including third party routers and software-based PPP dialers, as available in Windows 95.
  • The Single IP address translation feature allows a small or medium-sized office LAN to connect to the Internet using a single, dynamically or statically allocated IP address from the central access router.
  • BOOTP/IPCP support allows allocation of dynamic IP addresses to remote users.
  • Multilink PPP support enables use of ISDN at 128 kbps.
  • Models of the TRE Family are:
    • TRE16-1, with a single WAN link supporting a LAN segment on a router link
    • TRE16-8, with a single WAN link supporting a remote Token Ring LAN of up to 80 workstations on a bridge link or a full LAN segment on a router link
    • TRE16-8D, with dual WAN link supporting a remote Token Ring LAN of up to 80 workstations on each bridge link or a full LAN segment on each router link.


  • The WAN link interfaces are modular and accommodate several standards.
  • WAN link interface modules are:
    • ISDN Basic Rate Terminal Adapter for connection to ISDN networks
    • Digital interfaces (V.24/RS-232, V.35, X.21, RS-530 and V.36)
    • Integrated 4-wire short range modems operating up to 768 kbps for campus applications (see Table 1)
    • CSU/DSU for DDS leased lines.
  • Direct connection to ISDN services is provided via an internal ISDN terminal adapter module. Two B channels are available on the ISDN module, as well as one redundant link (sync/async). Protocols supported include: ETSI, NTT, NI-1, 5ESS, DMS-100 and leased ISDN (I.430).
  • The TRE Family can connect over a Frame Relay network (RFC 1490), using any synchronous interface. Up to 30 DLCIs can be configured for use.
  • A built-in 4-wire short range modem option operates at data rates up to 768 kbps. This option is suitable for campus or factory environments, where either a single station or a workgroup LAN requires connection to the LAN beyond the distance normally attainable over copper media. The 4-wire interface module has an internal clock with selectable data rates from 16 kbps to 768 kbps, according to the required range.
  • A built-in CSU/DSU operates at 56 kbps for direct connection to DDS networks.


  • Quick setup and configuration is performed via a terminal emulator attached to the control port, or by using Telnet access into the device over the LAN or WAN.
  • Diagnostics, configuration and monitoring can be performed from an ASCII terminal connected to the TRE control port. These functions include self-test and fault isolation, masking of frames for security and reduced loading of the wide area link, and monitoring of network statistics.
  • Telnet and Ping Terminal are supported for enhanced control and diagnostics of the device over WAN and LAN.
  • An SNMP agent provides inband or out-of-band management by any standard SNMP management station.
  • Software downloading via the control port is available using XMODEM, and via LAN or WAN using TFTP.
    Parameter file downloading and uploading is available via LAN or WAN, using TFTP.
    Product configurations and software are saved in FLASH memory. Two versions of the software are stored for redundancy.


  • An integral Solid Firewall protects an office LAN from undesired entry from the Internet, using session-based firewalling.
  • Internet Access authentication is provided by PAP/CHAP and the Scripting Tool.
  • PAP/CHAP security is provided for users with router links.
  • Dialback over PPP to a user with a router link at a fixed location is supported in Microsoft environments (e.g. opposite Windows 95). This adds security by verifying user identity and location. Dialback to a user whose location is changing reduces costs for mobile users.
  • Enhanced security support over bridge links includes user name and encrypted password authentication dialback.


  • Connection On Demand (COD) allows links to be connected or disconnected according to timeout, traffic or management. COD may be triggered based on user-defined masks.
  • Spoofing is utilized to reduce WAN link uptime and traffic by increasing the period between RIP, SAP or Keep Alive broadcasts.
  • PPP multilink operating at 128 kbps enables maximum utilization of ISDN lines.
  • Filters based on user-definable masks improve WAN utilization by ensuring that only necessary packets are transmitted over the WAN. Broadcast and Multicast packets can also be masked from a specific local or remote LAN RANger device. To ensure high performance and easy installation, a special hardware filtering technique is utilized.


  • TRE is supplied as a standalone unit. Special hardware for mounting either a single unit or two units side-by-side in a 19" rack, using minimal rack space of 1U (1.75") in height, can be ordered separately


  • Modular Token Ring router/bridge
  • Remote access routing and bridging on link-by-link basis
  • IP and IPX routing
  • Bridge links transparently support all Level 3 protocols
  • Backup capability for router and bridge links
  • Transparent remote-to-remote forwarding
  • Router links support PPP dialers including Windows 95
  • LAN interface: STP and UTP
  • WAN interface modules for:
    • ISDN-BRI for switched connection
    • Interfaces for leased line / dial-up modems
    • 4-wire built-in modem for campus applications
    • CSU/DSU for DDS connection
  • Integral Frame Relay (RFC 1490)
  • Quick setup and configuration
  • Solid Firewall (session-based) protection
  • Single IP address translation
  • BOOTP auto configuration for IP router links
  • PAP/CHAP security for PPP links
  • Scripting tool
  • RADIUS billing and authentication support
  • Managed from any standard SNMP Management platform
  • FLASH memory for software and parameter file downloading
  • Dual image FLASH
  • Enhanced WAN utilization and access control using:
    • Protocol/address filtering
    • Connection on demand
    • Spoofing for RIP, SAP and Keep Alive
    • PPP multilink up to two B channels
    • PPP-LCS STAC compression

Single Link Token Ring Remote Access Router

Single Link Token Ring Remote Access Router/Bridge

Dual Link Token Ring Remote Access Router/Bridge

# Specify single link interface:
V35 for V.35 interface
V24 for V.24/RS-232 interface
X21 for X.21 interface
V36 for V.36/RS-422 interface
530 for RS-530 interface
4W for 4-wire built-in modem
$ Specify dual link interface(s):
V35D for dual V.35 interface
V24D for dual V.24/RS-232 interface
V35V24 for combined V.35 and V.24/RS-232 interface
X21D for dual X.21 interface
V36D for dual V.36/RS-422 interface
530D for dual RS-530 interface
4WD for 4-wire dual link built-in modem
DDS-V24 for built-in CSU/DSU
IBE/V24 for ISDN "S" interface and V.24/RS-232 interface
IBE/V35 for ISDN "S" interface and V.35 interface
IBU/V24 for ISDN "U" interface and V.24/RS-232 interface
IBU/V35 for ISDN "U" interface and V.35 interface

Hardware for mounting one or two units in a 19" rack





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