NEC NEAX NDA-24349 - Manual (Page 120)

Chapter 5 Station Equipment
Page 5- 44 NEAX2000 IPS Request For Proposal (RFP) Reference Guide
NDA-24349 Issue 4
D
term
Extenders
The NEC D term Extenders extends the operation of the NEAX2000 IVS 2 digital telephone to a
remote location. The NEC D term EXTenders are available in two models: D term EXT (ISDN) &
D term EXT (Analog).
D
term
EXT (ISDN)
The D term EXT (ISDN) consists of two units, a Switch Module and a Remote Module, referred to as an
“Office Module (OPE-OF Module)” and a “Remote Module (OPE-RE Module)” respectively. The Office
Module is located at the PBX side and is connected to a Series E Digital Station Port from the PBX.
The Remote Module is located at the Remote Site and is connected to a D
term Series E (DTP-32DE-1
ONLY) display terminal.
The DTP-32DE-1 is the same as the DTP-32D-1 except it is registered with the FCC for home use. This
is the only NEC Digital telephone that has this “Residential FCC Registration”. All of the digital and
audio PBX functionality is extended, except that of data capabilities via the D
term . This extension is
accomplished via ISDN-BRI lines or 56K synchronous leased lines ordered from the Public Switched
Network, connected to Terminal Adapters (TA) or CSU/DSU’s, respectively, and then connected to an
NEC D
term EXT (Digital Line Extender). The D term EXT is connected to a standard Digital Line Port of the
NEAX2000 IVS 2 at the “Switch Location” and to a D term Series E terminal at the “Remote Location”. The
D term EXTs connect to the TAs or CSU/DSU’s with an RS-232 “Synchronous Clear Channel” serial
connection.
Session Handling over D
term
EXT
The user at the Remote Site is able to select between two modes of operation: “Continuous Operation”
or “Call-on-Demand Operation”.
When continuous operation is selected, the user initiates the session by using the Remote Module to
dial the Switch Modules’ Directory Number (DN) (by logging onto the Remote Module). After
establishing the session, the session will stay connected until the user chooses to disconnect (by
logging off of the Remote Module). This is the recommended operational method when data is being
sent through the D
term EXT (Remote Work-Station connected to the COM1 port).
When call-on-demand operation is selected, the user initiates the session by using the Remote
Module to dial the Office Modules’ (DN) telephone number. When there is no call in progress, the units
will time out and disconnect the B-Channel. When a user starts to place a
call or a call comes in at the
PBX location, the units will automatically re-establish a connection with one another. For this reason
(time out and disconnect of the B-Channel), if data is being sent through
The D term EXT modules (as in Figure 2.0) Call-On-Demand is not recommended. The data stream may
get disconnected in the middle of a data transfer because the voice stream controls the Time Out (idle
state of Series E Phone). Note: Call-On-Demand helps avoid continuous usage charges.
If Call-On-Demand is desired but the need of a data connection from the Remote Site to the PBX Site is
required, it is recommended that a terminal adapter, which supports two serial connections, be used
(such as the Motorola UTA220 TA). The NEC D
term EXT uses only one B-Channel of the ISDN-BRI
leaving the other B-Channel available for a data connection and/or single line devices. An ISDN TA
equipped with two serial ports will allow one to be used for the D
term EXT and the other to be used for
the data connection.