
SNA Protocol Support 21
Eicon IDLC
The Eicon ISDN Data Link Control (Eicon IDLC) protocol is a proprietary
Eicon protocol which enables the transport of SNA traffic via ISDN
connections. This protocol is used in communications with the Eicon Token
Ring Bridge.
The Token Ring Bridge resides on the same Token Ring LAN as the SNA host’s
communications controller or Front-end processor (FEP). The FEP manages
the flow of data between the LAN and the host. The Token Ring Bridge
manages the flow of data between the LAN and the ISDN network.
The Eicon IDLC protocol enables the gateway to access to the remote host
through the Eicon Token Ring Bridge. This protocol can be used to transport
any type of Logical Units (LUs) supported by the 2.0 and 2.1 type nodes in
Eicon SNA Gateway.
In the Eicon Configuration program, Eicon IDLC is abbreviated as EC-IDLC.
802.2 LLC (SNA LAN Gateway only)
With an 802.2 LLC connection (also commonly referred to as IEEE 802.2
Logical Link Control), SNA LAN Gateway allows a client to connect to IBM
devices that are directly attached to Token-Ring (802.5) or Ethernet (802.3)
LANs.
SNA LAN Gateway uses the port on your Token-Ring or Ethernet LAN card
to make an 802.2 LLC connection instead of going through a port on the
Eicon IDLC
Link
IBM Mainframe
Front-End
Processor
Token Ring
LAN
Token Ring Bridge PC
Client Workstation
(SNA LAN Gateway only)
Gateway PC
Client Workstation
(SNA LAN Gateway only)
Client Workstation
(SNA LAN Gateway only)
Connecting to a Token Ring Bridge with Eicon SNA Gateway
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