Filter
Top Products
DIG-LINE (Digital Line)
Issue 1 June 2005 925
Each digital line port supports two 64 kbps information channels (primary and secondary) and
one 8kbps signaling channel. Digital voice terminals always use the primary information
channel, and only one voice terminal can be connected to each port. The secondary information
channel can be used to connect a data terminal via a Digital Terminal Data Module (DTDM) or a
Data Adaptor (DA). All other devices currently supported by Digital Line circuit packs
communicate on the primary information channel. Figure 45: Digital Line Connectivity on
page 925 shows examples of digital line connectivity.
Use only the TN754B or TN2136 circuit packs in out-of-building applications.
The TN2181 and TN2224B/CP support both modes as shown in Figure 45: Digital Line
Connectivity on page 925 and Figure 46: Digital Line Connections on page 926.
Figure 45: Digital Line Connectivity
.
.
.
.
.
.
.
TN413, TN754/B
Digital Line
Circuit Pack
Port
Port
Port
Port
Secondary Information Channel (Data)
DTDM
Digital
Voice
Terminal
Control Channel (Signaling)
Primary Information Channel (Voice)
Physical Connection
. . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Digital Line
. . . . . . . . . . . . . .
Data
Terminal
.
.
.
.
.
.
.
.
.