Web Interface Settings Glossary 83
VHSI Port Menu
Line Interface
Defines the type of line connected to the VHSI port. Choices:
• Leased: The port is connected to a null-modem cable or a modem that links to a dedicated
leased line.
• Dial: The port is connected to a modem that must be dialed to make a connection.
Duplex
Defines the type of device the VHSI port is connected to. Choices:
• Full: The port is connected to a full-duplex device. This is the most common case and is usually
the choice for an X.25/QLLC connection.
•Half: The port is connected to a half-duplex device. This is most often used on an SDLC
connection.
Multidrop
Defines the type of line connected to the VHSI port: point-to-point or multi-point.
VSHI Interface
Defines the VHSI port interface: RS-232 (V.24) or V.35. Specify ‘Autodetect’ to have the
Eicon 1530 detect the type of interface automatically.
Data Encoding
Defines the type of data encoding used on the VHSI port.
This setting must match that of the remote system.
• NRZ: Enable Non Return to Zero encoding. Can be used for internal or external clocking.
• NRZI: Enable Non Return to Zero Inverted encoding. Can be used with internal or external
clocking, and INT-DPLL (Internal Digital Phase Lock Loop) or EXT-DPLL (External Digital
Phase Lock Loop) with a line speed limit of 19,200 bps.
• FM0: Enable FM0 (also known as biphase space) encoding. Can only be used with INT-DPLL
clocking with a speed limit of 38,400 bps.
• FM1: Enable FM1 (also known as biphase mark) encoding. Can only be used with INT-DPLL
clocking with a speed limit of 38,400 bps.
Clocking
Defines how the VHSI port is clocked, which controls synchronization and the rate of data
exchange on the line.
• EXTERNAL: The port uses the clock supplied by the device it is connected to (DCE) for
receiving and transmitting.
• INTERNAL: The port generates an internal clock for receiving and transmitting, and outputs
this clock on the interface for use by the device it is c onnected to (DCE).
• EXTDPLL: The port employs a DPLL that uses a DCE generated clock at 32 (NRZI) or 16
(FM) times the data rate.
• INTDPLL: The port employs a DPLL that uses an internally generated clock at 32 (NRZI) or
16 (FM) times the data rate.