Westermo ID-90 - Manual (Page 119)

119 6607-2204
Subaddress
Additional addressing information appended to the ISDN number. ISDN subaddresses are not
needed by the network to route the call; instead, they are used by the called terminal equip-
ment (such as a PBX) to direct the call to a specific device (such as an ISDN telephone).
synchronous access mode
Mode of data transmission whereby start-stop framed data octets from V.24 circuit 103 are
stripped of the start and stop bits and concatenated for transmission to the remote DCE. The
synchronous bitstream from the remote DCE is divided into octets and transmitted to the
local DTE on V.24 circuit 104 with start and stop bits inserted. Flow control is available to
allow the DTE-DCE octet transfer rate to be matched to that of the line without buffer under-
run or overrun. While in this mode, operation may be alternated between a Transparent sub-
Mode where no additional bit processing is done by the DCE, and Framed sub-Mode where
bit-oriented synchronous protocol framing is performed by the DCE.
synchronous mode
Mode of data transmission whereby the V.24 circuits 103 (TD) and 104 (RD) transfer data
synchronously at the modem-to-line interface rate, using V.24 circuits 113 or 114 for
transmitter bit timing, and circuit 115 for receiver bit timing. The modem does not buffer
data in either, nor does it implement flow control.
T_Interface
Interface between NT1 and NT2.
TA
Terminal adaptor (TA), function that allow a TE2 terminal to be served by an ISDN user-
network interface. Adaptors between physical interfaces at reference points R and S or R
and T are examples of equipment or combinations of equipment that provide TA func-
tions.
TCM
Trellis Coded Modulation. Used in the highest speed modulations.
TD
Transmitted Data. Data going from DTE to DCE.
TE
Terminal Equipment
TE1
Terminal equipment type 1 (TE1),function with an interface that complies with the ISDN
user-network interface Recommendations.
TE2
Terminal equipment type 2 (TE2), function with an interface that complies with interface
Recommendations other than the ISDN interface Recommendation (e.g. the X-Series
interface Recommendations) or interfaces not included in CCITT Recommendations.