IBM 3745 Series Service Functions page 298

TSET transmitter signal element timing
VPD vital product data
(signal, same as TC)
VRC vertical redundancy check
TSS transmission subsystem
VS virtual storage
TTA translate table area
VTAM Virtual Telecommunications Access
TTD temporary text delay (BSC) Method
T1 US service for very high speed trans-
V.24 CCITI V.24 recommendation
missions at 1.5 million bps
V.25 CCITT V.25 recommendation
UA unnumbered acknowledgment (SDLC)
V.28 CCITI V.28 recommendation
UC universal controller
V.35 CCITI V.35 recommendation
UCW unit control word
WACK wait before transmit positive acknowl-
UE unit exception (channel status) edgment (BSC)
UEPO unit emergency power-off WB wrapback (signal)
UK United Kingdom WKR work register
UKA user key address WSDR wide storage data register
UKP user key program XI X.25 SNA interconnection
UKDR user key data register XID exchange identification
UKL user key level interrupt XREG external registers
URSF universal remote support facility X.21 CCITT X.21 recommendation
USASCII (see ASCII) X.25 CCITI X.25 recommendation
us microsecond YZxxx wiring diagram
VB valid byte (signal) ZI zero insert
VCNA VTAM node control application
ZREG
Z register
VH valid halfword (signal)
List of Abbreviations
X-7