The device also had to support any combination of bisync
and SNA device types," he recalls.
Interfaces fall into several classes: local interfaces, providing four or eight independent channels; local multiplexers, supporting as many as 128 devices over two twisted pairs; gateways, for accessing IBM SNA or Bisync
networks as well as X.
This is accomplished using intelligent line-monitoring units (LMUs) that monitor 3270 SDLC and bisync
protocol-related activity and send the information to the 90/60 data base.
In Figure 1, one can see the normal data line monitor display of Bisync
The new OAS document transfer capabilities allow documents to be sent between OAS systems and non-OAS systems using Honeywell's DSA and IBM's SNA and bisync
WAN-attached branches, in particular, require a cost-effective solution for access to the new frame relay, leased line, or ATM networks, yet often still are required to support legacy devices such as automated teller machines, bisync
printers, and ASCII terminals.
NCP is responsible for handling the line protocols, which could be 3270 bisync
in addition to Synchronous Data-Link Control (SDLC), to the cluster controlers and other FEPs.
transport legacy protocols such as async, SNA/SDLC, bisync
, TPP, and
In addition to SNA terminals, the network supports bisync
3270 and selected asynchronous terminals.
As part of its WSN strategy, Wang has also introduced a "pathway" between its VS systems and an IBM or IBM plug-competible host over an IBM 3270 SNA or bisync
A variety of protocols (async, bisync
, SDLC, HDLC, 8A1, 83B3, X.
25, SDLC, CDLC, Bisync
, Poll-Select (TC500), ALC, and SCADA share a sensitivity to network delay known as latency.
Each of the eight channels is fully programmable to support many high-performance serial communications protocols, such as asynchronous, monosync, bisync
, HDLC, SDLC, LAPB, LAPD, ISDN, and PPP.