user manual

ND-20292
CHAPTER 2
APRIL, 1990
mode. Relay contacts (armature) for relays 4, 5, and 6
can be found at the MDF ECR 4A/4B through ECR
6A/6B. Relay contacts (armature) 7,8,9, and 10 can be
found on the ECR-E ETU Al/B1 through A4/B4
connections CN 1 and CN2.
Connection information of the locally provided
amplifier and speakers is provided in Figure 200-53.
Audio output specifications can be found in Section
220.20 of this document.
It is not recommended to connect the locally provided
amplifier directly to the ECR-E ETU relay contacts.
These contacts are not designed to accept high level AC
signaling. Direct connection may also cause audio
crosstalk between Single Line Telephone, outside lines
and the tone ringing circuit.
270.5 MODEM TERMINATION
For Modem Pooling Connection, the following
conditions must be complied with and the following
equipment must also be made available:
A. The Electra Mark11 System must provide a
Multiline Terminal (with DTA-E Unit installed)
and an SLI-E( ) port to support each modem being
installed.
B.
Multiline Terminals with DTA-E Units installed
(other than those connected to modems) for data
r----------------------- ---v-e.
MODEM
MULTILINE
TERMINAL
WITH DTA-E
DTE
MULTILINE
TERMINAL
WITH DTA-E
communication with outside DTE (Data Terminal
Equipment).
,. -\,
i
C. For supporting the DTA-E Unit, ESI-EB ETUs
are required; to allow assignment of ESI-EB and
SLI-E( 1 ports for modem use, CPU-EB (or higher
revision level) ETUs are required.
The Electra Mark11 System provides the data
connecting paths and supports the control (setting and
releasing) of the paths for data communication.
Protocol support or conversion is not supported.
Figure 200-54 shows the modem pool connections, the
data path, DTE and other equipment required for
modem pool operation.
INSTALLATION
NOTE: Prior to connecting the modem to the DTA-E
Unit, ensure the modem is not powered.
A. Locate a modem near a Multiline Terminal (with
a DTA-E Unit installed) already programmed for
modem pooling.
B. Plug in the station line cord into the Multiline
-..
Terminal.
.’
/
C. Plug the AC/DC adaptor into the nearest nominal
117i AC outlet. Connect the DC output cable of
ES-EB
7
.---- --
I
I
I
I
c
CPU-E()
I
I
ELECTRA MARK11
LINE
-
Figure 200-53
Modem Pooling Block Diagram
200 - 44