Tbsu "Te" Mode Facilities - Toshiba Strata DK40 Installation & Maintenance Manual

DK40 Installation

TBSU "TE" Mode Facilities

The TE function conforms to ETSI ISDN Standards and has been tested and approved to
CTR3. It is designed to operate in "Point-to-Point" mode only and has a fixed TEI value of
"0" (zero). The interface is designed to be permanently active, at layer 2, after initial
installation. (i.e. The TBSU circuits will keep the Data Link Layer active by exchanging
"RR" frames). The reason for this is that if the DK40 needs to use the BRA circuit to provide
the system timing source so the physical layer must be maintained.
Bearer Service Handling
Incoming calls to a Digital or Electronic Key Telephone or a standard telephone device will
only be accepted if the Bearer Service is Speech or 3.1kHz. Outgoing calls from a Digital or
Electronic Key Telephone or a standard telephone device can be programmed to request
either Speech or 3.1kHz Audio Bearer Services.
Note
Supplementary Services
The following supplementary services are supported:
If the DK40 system receives Sub-Address information it is transparently passed onto the NT
type ports or ignored if the call destination is a Digital or Electronic Key Telephone, or a
standard telephone/device.
.
Pinout (TBSU - BRI Jack)
TBSU
TE-Circuit
Switch in
100-ohm TR
using RBSU
option switch.
Note: T is an ISDN standard
reference point.
Figure 2-23 TBSU to NT1 Point-to-point Connection
2-44
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
If modems are connected to standard telephone ports, any calls made from and to
those ports must have a 3.1kHz Bearer Service.
CLIP - Calling Line Presentation
COLP - Connected Line Presentation
DDI - Direct Dialling In
SUB - Sub Addressing sending and receiving
RJ-45
BRI
(Four-wire)
3
6
TX
4
5 RX
T
Demarcation Point
TBSU Two-circuit ISDN BRI Interface Unit
RJ-45
Pinout (NT1 - S/T Jack)
3
6
RX NT-1
Switch
in 100-ohm
4
TR.
TX 5
BRI
(Two-wire)
4
Network
BRI-line
5 RX/TX
Jack
Strata DK40 I&M Manual Spring 1999
TBSU NT!