ATT System 25 Reference Manual

Transfer To Data
Data Call Preindication
A multiline voice terminal user, by going off-hook and pressing an idle DATA button, may
indicate that a data call will be attempted. This reserves the associated data port and a
modem pool conversion resource.This procedure is recommended when the data call is a
trunk call. The data port reservation is acknowledged by a winking status LED at the DATA
button. Subsequently, invoking Transfer To Data transfers the call to the associated data
terminal.
Preindication...

FEATURES AND SERVICES
Trunk Groups
Description
This feature allows each trunk in the system to be assigned to one of up to 16 trunk groups.
Trunks link two switching systems, such as System 25 and the local CO or System 25 and
another PBX. Although not required,trunks can be grouped together in trunk groups
(sometimes referred to as pooled facilities) when all the trunks in the group perform the
same function. This grouping provides resource pooling that results in better service with a
given number of...

Trunk Groups
l Wink Start—A momentary signal (wink) is sent
trunks).
l Delay Dial—A steady signal is sent to the distant
to receive digits (Tie trunks only).to the distant switch (Tie and DID
switch and is removed when ready
l Automatic—No start dial signals are used.
The seizure signal sent or received is
sufficient to route the call (Tie trunks only).
Trunk groups connecting with a local CO, WATS office, or FX office can be ground or loop
start. DID trunk groups can be immediate or wink start. Tie...

FEATURES AND SERVICES
Facility Access Restriction (see “Calling Restrictions”):Stations may be restricted from
dialing the CO trunk pool and/or all (fifteen) other trunk groups (as a whole). Stations so
restricted may still dial out if they are transferred to a trunk by another station not so
restricted.
Tie Trunks: Refer to the “Tie Trunks” feature description.
Toll Restriction (see “Calling Restrictions”): When toll restricted stations access FX, WATS,
or Tie trunks, they are not toll restricted (i.e.,...

Trunk-To-Trunk Transfer
Trunk-To-Trunk Transfer
Description
This feature allows users to connect incoming trunk calls to other outside trunks and then
hang up (under certain conditions).
Incoming trunk calls may be transferred to another trunk, or conferenced with another trunk.
In all cases and at all times, either a System 25 station must remain in the conference or one
of the calls must be an incoming call on a ground start, loop start (administered for trunk-to-
trunk transfer), DID, or tie trunk.The...

FEATURES AND SERVICES
User Changeable Options
Description
User Changeable Options allows a data terminal user who is in the Command Mode to view
and change the settings of certain data port options.This feature is available to users of
Data Line CP ports; users of STARLAN Interface CP ports cannot change their port options.
Table 2-L contains brief descriptions of the user changeable options.
Table 2-L.User Changeable Options
OptionDefinition
Speedlow, 300, 1200, 2400, 4800, 9600, 19200, autobaud...

User Changeable Options
2-351 

FEATURES AND SERVICES
Viewing Options
When  is selected, current and default values for the various data port
options are displayed, as shown below:
OPTIONSCURRENTDEFAULT
At this point theSpeed (highest)
960019200 (Auto)
Parity
EvenEven
MismatchYesNo
Local EchoYesYes
Answer TextYesYes
Connect Indicat.YesYes
Recall SequenceBr-BrBr-Br

user can exit from the View options menu, Change options, or View options
again (redisplays the Options table).If the user elects to exit, the terminal returns to the...

User Changeable Options
Once a user has selected an option to be changed, a menu of valid settings for this option is
displayed (, , etc.).An “X” is displayed beneath the current setting of the
options, or beneath an option that may have been changed but not yet enabled. For all
options except  (see below), settings may be selected either by moving the cursor
(using the space bar) beneath the item desired and then pressing RETURN, or by typing the
single-letter code associated with that setting.The user...

FEATURES AND SERVICES
l If the user selects, the following menu is displayed:
OPTIONSCURRENTREQUESTED
Speed (highest)96004800 (Auto)
ParityEvenEven
MismatchYesYes
Local EchoYesYes
Answer TextYesYes
Connect Indicat.YesYes
Recall SequenceBr-BrBr-Br
The value in the CURRENT column indicates the current (active) status of the option.
The value in the REQUESTED column indicates the most recently entered value (not
yet enabled).
l If the user selects ,the system incorporates the changes
requested and displays...