Introduction to Networking for NonStop S-Series Servers

Device-Specific Connections
Introduction to Networking for HP NonStop S-Series Servers—520670-005
6-14
Bit-Synchronous Protocol Support
SNALU
SNALU provides a lower-level interface than SNAX/HLS, letting you develop
applications to communicate with other non-3270 SNA devices. Using SNALU requires
that you have a complete understanding of the SNA protocols for the device.
Bit-Synchronous Protocol Support
HP provides two products that you can use to support bit-synchronous devices other
than SNA devices: EnvoyACP/XF and CP6100. The first is described here; the second
in General-Purpose Protocol Support on page 6-14. The two products have different
programmatic interfaces; both products use the SWAN concentrator.
EnvoyACP/XF supports the following bit-synchronous protocols on either a point-to-
point or multipoint, switched or leased line:
•
Synchronous Data-Link Control (SDLC)
•
High-Level Data Link Control (HDLC)
•
Advanced Data Communications Control Procedures (ADCCP)
Developing an application that uses EnvoyACP/XF requires that you have detailed
knowledge of the protocol.
General-Purpose Protocol Support
HP provides three products that you can use to support a wide range of protocols. Two
of them are IOPs and are described here. The third is a higher-level product that you
use with an IOP and is described in Developing Your Own Front-End Process on
page 6-15.
Envoy is an IOP pair that supports a large number of byte-synchronous and
asynchronous protocols, including IBM BSC, SWIFT, ADM-2, and Burroughs, in
addition to full-duplex binary synchronous communications, and a generalized
asynchronous supervisor. Envoy is a low-level interface that requires that you have
detailed knowledge of the protocol you need.
CP6100 is a general-purpose IOP pair that supports asynchronous, byte-synchronous,
or bit-synchronous protocols. CP6100 can be used for system-to-system data
transmission or for transmission between a NonStop S-series server and various
devices.
CP6100 passes application data to protocol modules on the communications line
interface processor (CLIP) of the SWAN concentrator. Each protocol module controls a
single communications line. The following protocol modules are available from HP:
•
6100 BSC Point-to-Point. Allows a NonStop S-series server to be either a primary
or secondary station on a binary synchronous point-to-point line.
•
6100 BSC Multipoint Supervisor. Allows a NonStop S-series server to act as
supervisor on a binary synchronous multipoint line.