Envoy ACP/XF Configuration and Management Manual

Glossary
EnvoyACP/XF Configuration and Management Manual—429232-003
Glossary-5
V.25 bis
V.25 bis. A CCITT recommendation for a protocol for setting up a data connection on the
general switched telephone network, using a serial modem with automatic calling
capability.
WAN subsystem. The software that provides access to the ServerNet wide area network
concentrator and provides configuration functions for the subsystems attached to the
network.
window. The window size indicates the maximum number of I-frames that can be sent
without acknowledgment. The window size may be less than the modulo size, but may
never exceed the modulo size.
zero-bit insertion. A method of distinguishing other fields from the flag field in a
bit-synchronous frame. The only field where 6 successive 1 bits may occur is the flag
field. In all other fields, the concentrator on the transmitting end automatically inserts a
0 bit after five successive 1 bits. The concentrator on the receiving end automatically
strips the added 1 bits.