Toshiba Strata Dk14, Dk40i, Dk424 General Description Manual

							Features
System Features
Strata DK Feature Description 5/9957
Hotline Service (Emergency Ringdown)
Analog single-line telephones can be programmed so that when the user goes off-hook, they 
automatically ring a designated extension without dialing. The receiving station or Attendant 
console displays the station name/number of the off-hook calling station.
This feature is very useful for hotel/motel applications, in which lobby or public area telephones 
either do not have dial access, or for convenience, automatically call the front desk.
This feature is also very useful for healthcare applications. If an analog single-line station is left 
off-hook and fails to complete the dialing of a valid number within a programmable time period, 
continuous ringing occurs at a designated extension.
Benefits
Provides convenience and service to hotel/motel guests calling from lobby or public area 
telephones. In healthcare applications, emergency ringdown operation assists callers who may not 
be able to complete the call by dialing.
System Availability
Unavailable for Strata DK14
Standard on Strata DK40i/424 (only works 
with SLTs, not DKTs) 
						

							Features
System Features
58Strata DK Feature Description 5/99
ISDN Basic Rate Interface (BRI)
BRI is the smaller capacity ISDN interface, providing two simultaneous voice or data connections. 
BRI uses the 2B+D transmission format which is defined as two 64 kbps bearer channels and one 
16 kpbs data (control) channel.
The two B-channels can also be combined for data transmission at speeds up to 128 kbps. The D-
channel carries call setup control data and can also be used as a third connection for packet data 
transmission when using an external NT-1.
ISDN BRI services are designed mostly for end-user station interfaces. The system can connect 
group IV faxs, PCs, computer terminals or ports, LAN bridges and routers, video conferencing 
terminals, or other devices that can benefit from an all digital transmission link.
The DK40i and DK424 system also supports BRI interface from the public network as CO line 
service. The station-side connection supports multi-point multiple device connection to the same 
BRI circuit. Applications that are supported include:
©Video conferencing
©Remote access servers
©Faster Internet access
©High-speed data connections to the public ISDN network, as well as typical voice and fax 
connections
©Calling Number ID services
©DID
Calling Number ID services are provided through the D-channel function of ISDN’s out-of-band 
signaling format. The ISDN link sends the Caller ID for the service originating the call. This 
number can be the listed DN, DID number, or a private line number used for billing, as well as 
identification to the called location. Caller ID blocking and screening are available options. 
Incoming calls are identified by Caller ID and the information is used in the DK424 like ANI. 
DNIS information is also provided over ISDN lines.
The Strata 40i supports the BRI interface by installing the Basic Rate Interface Unit S/T (TBSU) in 
the base cabinet. The TBSU provides two BRI S/T (four wire) interfaces that can be independently 
used for network- or station-side connections.
The following BRI S/T Interface cards are supported by DK424 Release 4.1 and higher systems. 
The DK40i also supports these interfaces in the expansion cabinet:
©Basic Rate S/T Interface Unit (RBSU) provides two BRI S/T (four-wire) interfaces that can be 
used for network- or station-side connections. It has connectors for a two-port add-on 
subassembly.
System Availability
Unavailable for Strata DK14
Optional on Strata DK40i/DK424 (Release 
4.1 and higher) 
						

							Features
System Features
Strata DK Feature Description 5/9959
©Basic Rate S/T Interface Subassembly (RBSS) attaches to the RBSU to provide two additional 
BRI S/T interfaces that can be used for station-side connections only.
The combination of the RBSU and the RBSS subassembly can provide four BRI interfaces in one 
card slot.
NoteNetwork connections using BRI S/T interface require a customer-supplied external NT-1 
device.
The following BRI U Interface cards are supported by DK424 Release 4.2 and higher systems:
©Basic Rate U Interface Unit (RBUU) provides two BRI U (two-wire) interfaces that can be 
used for network- or station-side connections. The RBUU has connectors for a two-port add-
on subassembly.
©Basic Rate U Interface Subassembly (RBUS) attaches to the RBUU to provide two additional 
BRI U interfaces that can be used for station-side connections only.
The combination of the RBUU and the RBUS subassembly can provide four BRI interfaces in one 
card slot.
ISDN Applications
ISDN features can be employed in many useful applications.
©Calling Number Services: The Signaling System 7 (SS7) communications network supports 
ISDN PRI trunks across various CO switching systems by providing end-to-end digital 
connectivity. In a calling number service application, for example, this extends calling number 
information across the entire Public Switched Telephone Network (PSTN) by passing this 
information across the various CO switching system nodes. Calling number information is 
very important in CTI applications.
©High Speed Data: Performance improvement (speed and accuracy) and connectivity is 
becoming a major factor in ISDN data-related applications. For example, a computer database 
interface works well on ISDN lines for large capacity file transfer, high resolution graphics 
transfer, online transaction processing, and information retrieval applications. ISDN provides 
better performance for these applications which require faster call setup and network response 
times than older, more restrictive analog networks can provide. ISDN also provides higher 
data accuracy than today’s analog network.
©Video Conferencing: Color video transmission requires greater bandwidth and flexibility for 
video conferencing and related applications. Video conferencing systems integrate cameras, 
displays, CODECs, and control units. The CODEC can set up various transmission rates 
between 64 kbps and 1.5 Mbps, as required.
©Video Telephones: Video phones can transmit voice and image simultaneously with ISDN. 
Transmission of still images at high speeds is easy, as well as color moving picture 
communication among several parties. This integrates a telephone, a video camera with an 
image sensor, and a small color LCD display.
©Multi-device Connection: Up to eight devices can share one ISDN BRI line using station-side 
connections. For example, one line can accommodate two phones and multiple PCs or fax 
machines. The station interface is limited to two DNs. With conventional analog service, two 
lines are required to transmit data and talk on the phone at the same time, unless a Data 
Interface Unit (DIU) is used. The customer saves money by sharing CO line resources and is 
provided the benefits of higher speed. 
						

							Features
System Features
60Strata DK Feature Description 5/99
©Multiple LAN Link: Linking multiple LANs together, using ISDN, is very efficient at the 64 
kbps high-speed rates, and data transmission over the digital network provides extremely high-
data accuracy. This would replace the typical LAN bridge and modems in use today, which are 
much slower and provide less data accuracy via the analog network. The DK40i and DK424 
support BR1 station-side connection of access router devices used in these applications.
©High Speed Fax: G4 Facsimile offers high-speed and high-image quality. G4 Fax machines do 
not have to be isolated within a stand-alone system. Many G4 Fax machines can also 
communicate with G3 Fax machines, because the connection with existing networks is 
handled by the ISDN side.
©Telecommuting: The idea of employees working at home is a much more effective and 
practical option with ISDN services. The employees have access to office technology 
necessary to make them work almost as effectively at home as in the office.
©Resource Sharing: Local network functions, such as printer sharing and modem sharing, are 
supported by connecting these devices through terminal adapters. Users can share equipment 
regardless of location. It also eliminates the need for dedicated connections, since all network 
resources are available on a dial-up basis.
©ISDN BRI through Centrex: This is offered by many local exchange carriers, who offer both 
Centrex and ISDN lines. Blending the calling features of Centrex with BRI provides many 
customized capabilities. Examples are Caller ID, and the ability to set up data calls between 
parties using the 64 kbps B-channel without the need for lower speed modems.
©Carrier Gateway: This is the general “catch all” category that connects anything to anything 
over the PSTN. Using ISDN for this purpose provides speed, accuracy, and connectivity 
advantages for applications like Internet connection, e-mail, Telex, Voice Mail, and Fax 
forwarding.
Benefits
Faster call setup times make ISDN call connections faster, because a separate modem-type of 
communication with the public network is used. Calls using analog connections or T1 digital 
connections can take several seconds longer before the call connection is made, because they send 
DTMF tones and wait for audible tones in return.
Immediate Caller ID is provided on ISDN calls, because Caller ID is transmitted with each call 
setup message. This makes Caller ID information immediate rather than waiting for this 
information to be sent after starting the ringing process as with analog lines.
Higher speed digital data connection is possible on a BRI connection to the ISDN network.
DID-type functionality enables direct incoming calls to be routed and ring at designated 
telephones according to the number dialed. This provides DID functionality over ISDN lines 
without the additional expense of purchasing a block of numbers from the telephone company and 
subscribing to DID service. 
						

							Features
System Features
Strata DK Feature Description 5/9961
ISDN Primary Rate Interface (PRI)
PRI is the larger capacity ISDN interface, providing 23 simultaneous voice or data connections. 
PRI uses the 23B+D transmission format which is defined as 23 64 kbps bearer channels and one 
64 kbps data (control) channel, with total bandwidth of 1.536 Mbps.
ISDN PRI is designed as the bulk trunk interface to the ISDN network. PRI connects the DK424 
telephone system to an intra- or inter-LATA communication provider. PRI can be used to send and 
receive voice and data.
PRI can save money by enabling the multiple use of the channels on the PRI link for a variety of 
services on demand, such as DID, Tie, FX, WATS, 800, etc. This capability to support multiple 
services and dynamically allocate channel use as needed is known as the call-by-call feature and is 
described in more detail below. PRI lines also support the Calling Number ID Services also 
described below.
ISDN PRI is supported in the DK424 system by using the Primary Rate Interface Unit (RPTU). 
The RPTU is a 24-channel PRI card providing 1 data (control) channel and 23 bearer channels. All 
B-channels appear and program as CO lines in the DK424 system and can be individually 
configured for local service, FX, WATS, DID, Tie line, etc. service operation. Network connection 
using PRI interface requires a customer supplied external Channel Service Unit (CSU).
The DK424 provides the following ISDN PRI features:
©Call-by-Call Service Selection permits the grouping of individual PRI B-channels to be shared 
among various types of services specified by the customer, instead of having to dedicate each 
channel to a particular type of service. For example, when using standard (POTS), DID, Tie, 
FX, WATS, and 800, the line circuits (individual or groups) of B-channels of a PRI circuit can 
be designated to these various services dynamically on a call-by-call basis.
B-channels can be dynamically allocated among services on a demand basis, depending on 
varying requirements for outgoing and incoming calls. This could also be used for voice or 
data on demand. This dynamic allocation of service can reduce the number of circuits required 
to access various services, especially if different services have peak busy periods at different 
times of the day.
Release 4.2 enables a minimum and maximum number of B-channels to be used for each 
service on this common set of B-channels in system programming. Each of these values can be 
set for three time periods during the day. With these values, calls can be rejected if they exceed 
the maximum number subscribed for that service or they can ensure that a minimum number 
of channels remain available for incoming calls. Thus, the system can be used to provide an 
optimum service to meet the objectives of the business.
©Non-facility Associated Signaling increases traffic handling on PRI lines. A single 64 kbps D-
channel on one PRI line can be used to handle the signaling for two PRI lines on the DK424 
system, instead of the usual signaling that requires one 64 kbps D-channel for each PRI line. 
System Availability
Unavailable for Strata DK14/DK40i and 
DK424 using RCTUA processor
Optional on Strata DK424 using RCTUBA/
BB, RCTUC/D or RCTUE/F processors  
						

							Features
System Features
62Strata DK Feature Description 5/99
This is very important when using the Call-by-call feature to enable trunk groups larger than 
the 23 B-channels available on one PRI line. This extends the number of call-by-call B-
channels to 47 (2 x 24 -1) and extends the number of B-channels on the second (non-signaling) 
PRI line from 23 to 24. This provides better performance and cost savings in high volume 
ISDN PRI applications.
©Calling Number Services are provided through the D-channel function of ISDN’s out-of-band 
signaling format. The ISDN link sends the Caller ID for the service originating the call. This 
number can be the listed directory number, DID number, or a private line number used for 
billing, as well as identification to the called location. Caller ID blocking and screening are 
available options. Incoming calls receive the Caller ID from the caller and is used in DK424 
like ANI. DNIS information is also provided over ISDN lines.
Calling Number Services can be divided into four different types:
©Number Provisioning for outgoing calls is controlled by subscription parameters with your 
telco provider. The choice is for the number to be necessary or not. The number sent is 
based on the call originator and the call type. The originator can be a tandem call, a station 
(with or without DID), or a station with a designated number. The type of call refers to 
whether it is direct or redirected (call forwarded).
For a tandem call, the Calling Party Number digits received are the digits that are sent. For 
a direct station call, the default number assigned to the selected service and which is 
programmed into the Strata DK as the Listed Directory Number are the number that is 
sent. In this case, the system can send a fixed number (assigned in the system) or it can use 
the DID programming to determine he number to be sent.
©Number Screening is a feature of the public network. This is normally performed by the 
network to ensure the call being placed has a valid billing number for the call. In systems 
with a flexible Calling Number Provisioning, the network can perform the screening of the 
call to ensure the number provided is valid for billing or reject the call, rather than 
completing the call and billing it to the default Listed Directory Number.
©Number Privacy enables the caller to prevent the public network from delivering the 
Calling Number to the called party on a per-call basis. Service subscribers can request 
from the public network that the number be presented or not as a default. Subscribers can 
also select the ability to change or not change the default settings. If a public telco service 
enables changes to be made, then a user can enter change a code to the setting for that call 
after selecting a trunk group.
©Number Delivery sends the calling number with the call setup message to indicate who is 
calling, if that number is not blocked. When the Strata DK receives this number, it is 
handled the same way that ANI information from T1 trunks is handled. i.e., The number 
displays on the called telephone’s LCD, or it can be used by TAPI interfaces, or recorded 
in SMDR data records, etc.
NoteName Delivery is not currently supported due to the lack of a common specification for 
the public ISDN network.
ISDN Applications
©Calling Number Services: The Signaling System 7 (SS7) communications backbone network 
supports ISDN PRI trunks across various COs. ISDN depends upon SS7 out-of-band D-
channel signaling control to provide end-to-end digital connectivity. In a calling number 
service application, for example, this extends calling number information across the entire 
PSTN by passing this information across the various CO nodes. Calling number information is 
very important in Computer Telephony Integration (CTI) applications. 
						

							Features
System Features
Strata DK Feature Description 5/9963
©High Speed Data: Performance improvement (speed and accuracy) and connectivity is 
becoming a major factor in ISDN data related applications. For example, computer database 
interface works well on ISDN lines for large capacity file transfer, high resolution graphics 
transfer, online transaction processing, and information retrieval applications. ISDN provides 
better performance for these applications which require faster call setup and network response 
times than older, more restrictive analog networks can provide. ISDN also provides higher 
data accuracy than today’s analog network.
©Video Conferencing: Color video transmission requires greater bandwidth and flexibility for 
video conferencing and related applications. Video conferencing systems integrate cameras, 
displays, CODEC, and control unit. The CODEC can set up various transmission rates 
between 64 kbps and 1.5 Mbps, as required.
©High Speed Fax: G4 Facsimile via ISDN offers high speed and high image quality. G4 Fax 
machines do not have to be isolated within a stand-alone system. Many G4 Fax machines can 
also communicate with G3 Fax machines because the connection with existing networks is 
handled by the ISDN side.
©Telecommuting: The idea of employees working at home is a much more effective and 
practical option with ISDN services. ISDN can provide employees working at home access to 
office technology necessary to make them work almost as effectively at home as in the office.
©PRI Static Integrated Network Access: Designed to eliminate the cost of maintaining separate 
access lines for private-line services and switched services. The traffic over the two types of 
access lines can be combined over the same access line.
©Resource Sharing: ISDN lines can support local network functions such as printer sharing and 
modem sharing by connecting these devices through terminal adapters. This enables users to 
share equipment regardless of location. It also eliminates the need for dedicated connections, 
since all network resources are available on a dial-up basis.
©Carrier Gateway: This is the general “catch all” category that would be used to connect 
anything to anything over the public network. Using ISDN for this purpose provides speed, 
accuracy, and connectivity advantages for applications like Internet connection, e-mail, Telex, 
Voice Mail, and Fax forwarding.
Benefits
Enables faster call setup times because a separate modem-type communication with the public 
network is used. Calls using analog connections or T1 digital connections can take several seconds 
longer before the connection is made because of DTMF tones.
Provides immediate Caller ID because it is transmitted with each call setup message. This makes 
Caller ID information immediate rather than waiting for this information to be sent after starting 
the ringing process as with analog lines.
Enables shared use of lines for voice, data, fax, and video on each channel for multiple purposes 
based upon the setup request. Lines can be used for many services without the need for modems or 
other devices, saving you money in monthly service charges.
Provides higher speed digital data connections for higher data accuracy. ISDN provides better 
performance for applications that require faster call setup and network response times than older, 
more restrictive analog networks can provide.
Enables DID-type functionality for direct incoming calls to route and ring at designated telephones 
according to the number dialed. This provides DID functionality over ISDN lines without the 
additional expense of purchasing a block of numbers from the telephone company and subscribing 
to DID service. 
						

							Features
System Features
64Strata DK Feature Description 5/99
Least Cost Routing (LCR)
LCR enables automatic routing of each outgoing call over the least costly trunk, CO line, or 
common carrier. A station user simply dials the access code (9) and the telephone number. The 
system can also choose a specific route for long distance or local calls when enabled. Up to three 
schedules can be set up, enabling different routes selected at different times of the day. Up to five 
special codes (ones that should never be blocked, such as 911) can be exempt from LCR. Ta b l e  8 
lists the LCR capacities for each Strata system.
An optional warning tone can be heard, if programmed, when the system has selected the most 
expensive route. The user can then wait until a less expensive line becomes available.
LCR is compatible with ABR and line-to-line connections. LCR and Toll Restriction features have 
the following additional capabilities:
©“Assume 9” – enables the input of four-digit Centrex numbers and be routed locally, even if 
the number conflicts with restricted long distance area codes.
©Special area codes that:
©Enable input without the “1” prefix, so calls are unrestricted and routed the same as local 
seven-digit numbers.
©Can be stored in a table (up to six special area codes) for areas not using standard North 
American Numbering Plan dialing.
©Special codes (begin or end with * or #) – overrides Toll Restriction so the call is routed 
locally in normal or Centrex environments. It can be used for Caller ID per-call blocking.
©Universal 976 number blocking. Four other office codes can be stored in a table to provide 
universal blocking.
Benefits
LCR reduces the costs of long distance calling by ensuring that each call is placed over the least 
costly route available to that user at that time. Placing a call is simpler for station users, since they 
do not have to decide which line to use, or remember how to access specific lines.
System Availability
Standard on Strata DK14/DK40i/DK424
Table 8 LCR Capacities
DK424
LCRDK14DK40iRCTUARCTUBA/BBRCTUC/DRCTUE/F
LCR route plans 8 8 8 8 16 16
Area Code/Office Code 
(AC/OC) exception 
tables88 8 8 16 16
Time schedules 3 3 3 3 3 3
Station classes 4 4 4 4 8 8
Route definition tables 4 4 4 4 6 6
Modify digit tables 6 6 6 6 12 12 
						

							Features
System Features
Strata DK Feature Description 5/9965
Line Call Pickup Groups
With the CO Line Call Pickup Group feature, up to two CO Line Call Pickup Groups can be 
programmed on DK14 and DK40i systems and up to four groups on DK424. Ringing CO lines in 
the first CO line group can be picked up with an access code or with the Directed Pickup1 button, 
if it appears on the telephone. Ringing CO lines in the second CO line group can be picked up with 
an access code or with the Directed Pickup2 button, if it appears on the telephone.
As an option, all CO lines could be put into one group. A ringing CO line could then be picked up 
with an access code or with the Directed Pickup button.
On Strata DK systems with tenant service, the CO lines for tenant 1 could be put into one CO line 
group, and the CO lines for tenant 2 could be put into another CO line group. Then,    tenant 1 
station users can use the Directed Pickup1 button and tenant 2 station users can use the Directed 
Pickup2 button to pick up the CO lines assigned to them.
Benefits
Enables convenient and efficient call handling for CO line calls. Station users do not have to 
determine which CO line is ringing in order to answer it, nor does the ringing CO line have to 
appear on their telephone in order for them to pick it up.
System Availability
Standard on Strata DK14/DK40i/DK424 
						

							Features
System Features
66Strata DK Feature Description 5/99
Line Groups
Also known as Trunk Groups, this feature enables the CO lines on any Strata system to be assigned 
to CO line groups. Station users can access the CO line groups by dialing a specific CO line group 
access code. This enables a customer to group various types of CO lines together for convenient 
access.
For example, a customer might want to put Tie lines in one CO line group and WATS lines in 
another. Users would then access the CO line group that was appropriate for the type of call being 
placed. If all lines in that CO line group were busy, the user could queue for the CO line group.
If the system is programmed for Least Cost Routing (LCR), station users do not need to select a 
specific CO line group. DK14 systems recognizes up to four CO line groups. DK40i and DK424 
systems with RCTUA or RCTUBA/BB processor can be programmed for up to eight CO line 
groups. DK424 systems with an RCTUC/D or RCTUE/F processor can be programmed for up to 
16 CO line groups.
CO line groups are also the pooled line groups that can be assigned to buttons on a DKT. Pooled 
Line Group 1 is CO Line Group 1, Pooled Line Group 2 is CO Line Group 2, and so on. Up to four 
Pooled Line Group buttons for the same CO line group can be assigned to a station to facilitate 
handling several calls on that CO line group at that station. See “Pooled CO Lines” for more 
information.
Benefits
Enables queuing, single-line telephone access to CO lines, Pooled lines, CO line Call Pickup 
Groups, and Tenant Service. They are also used to define LCR schemes.
System Availability
Standard on Strata DK14/DK40i/DK424