Data Unit Capabilities; Data Unit Configurations - Northern Telecom DMS-100 Series Installation And Maintenance Manual

0
0
0 This chapter outlines the capabilities of a data
0 briefly describes DU configurations.
0

DATA UNIT CAPABILITIES

0 A DU provides an interface between data terminal equipment (DTE)
0 and a two-wire non-loaded loop.
0 wire loop using
0 technology provides a data channel that is
0 data at a rate of 64 kbps with an 8 kbps signaling channel.
0 There are two types of data units:
0 * RS-232C data units
0 * V.35 data units
0 RS-232C data units have an RS-232C DTE interface and are capable
0 of transmitting data synchronously
0 mission speeds are user-selectable up to 19.2 kbps in full-duplex
0 mode (half-duplex mode is supported).
0 able in desktop (standalone) or rackmount models.
0 V.35 data units have a V.35 interface and are capable of trans-
0 mitting data synchronously at 48 kbps, 56
0 full-duplex
0 are available in desktop or rackmount models.
0 Data units have controls and indicators
0 features and diagnostic self-tests.
0 For detailed
0 page 3-1. For details on diagnostics see Chapter 5 on page 5-1.
0

DATA UNIT CONFIGURATIONS

0 Data units can be connected in either of two configurations:
0 * switched
0 * non-switched
0 In a switched configuration, the DU is connected to a
0 card (DLC)
0 tion, data on the two-wire loop is switched through
0 office to another DU and DTE (see Figure 2.1 on page 2-2).
0
time compression multiplexing (TCM).
mode (half-duplex mode is supported).
descriptions and specifications see
in the DMS-100 Family switch.
Data is transmitted on the
capable
or asynchronously.
The RS-232C DUs are avail-
kbps or
for selecting
In a typical applica-
297-2121-226
VINTAGE 05.01
unit (DU) and
two-
The TCM
of handling
Trans-
64 kbps in
The V.35 DUs
options,
Chapter 3 on
data line
the central
2-1