Specifications

10 MultiModemISI Hybrid Series, ISIHI-2S/2U
Chapter 1—Introduction
The name of the S/T bus comes from the letters used in the ISDN specifications to refer
to two reference points, S and T. Point T refers to the connection between the NT1
device and customer supplied equipment. Terminals can connect directly to NT1 at point
T, or there may be a PBX (private branch exchange, e.g., a customer-owned telephone
exchange). When a PBX is present, point S refers to the connection between the PBX and
the terminal.
Note that in ISDN terminology, terminal can mean any sort of end-user ISDN device,
such as data terminals, telephones, FAX machines, etc. The following diagram reflects
interface points in a typical ISDN network.
Terminal
Terminal
NT2
(PBX)
NT2
Telco Company
Interface
Terminal
Point S
Point S
48 wires
Point S
Point T
48 wires
Point U
48 wires
Manual Organization
Chapter 1: IntroductionIntroduces and describes the ISIHI-2S/2U. It describes
features, provides manual organization, and lists technical specifications.
Chapter 2: Hardware InstallationDescribes how to install the ISIHI-2S/2U card into
the ISA bus of your personal computer system and how to configure card settings (I/O
address DIP switch setting and jumper setting). This chapter also provides you with
procedures for physically connecting the ISIHI-2S/2U to the ISDN BRI line.
Chapter 3: Software/Driver InstallationProvides detailed steps to install software/
drivers to configure and operate the ISIHI-2S/2U via its firmware-based ConfigMenu
utility or software-based ISDN TA Configuration Wizard.
Chapter 4: Modem AT Commands, S-Registers, Result CodesProvides an
introduction to the ISIHI-2S/2Us modems command mode fundamentals followed by a
detailed explanation of each AT command with examples where applicable. This chapter
also describes the modems S-registers, which are used to store various modem options,
and result codes that report the results of a command.
Chapter 5: Terminal Adapter AT Commands, S-Registers, Result CodesProvides
an introduction to the ISIHI-2S/2Us terminal adapters command mode fundamentals
followed by a detailed explanation of each AT command with examples where applicable.
This chapter also describes the TAs S-registers, which are used to store various modem
options, and result codes that report the results of a command.
Chapter 6: Troubleshooting GuideIf you think your ISIHI-2S/2U is not working
correctly, this chapter covers common problems and how to solve them.
Chapter 7: Service, Warranty, and Technical/BBSProvides information on the
ISIHI-2S/2U warranty, instructions for getting the ISIHI-2S/2U serviced at the factory,