Instruction manual

System Features
T1 Interface (DK40i, DK424i only)
90 Strata DK General Description 6/00
T1 Interface (DK40i, DK424i only)
The T1 (DS-1) interface provides the system with up to 24 digital voice channels that can be
individually programmed to operate as ANI, DNIS, Tie, DID, loop start or ground start CO lines.
This allows the system to connect to a CO, Long Distance Provider or another type of Key or PBX
system with a T1 interface.
The T1 interface (via the RDTU2 PCB) provides economic advantages through the high-traffic
carrying capacity of its 24 channels for the DK424i and eight or 12 channels for DK40iand the
cost-effectiveness of its digital transmission facilities. This feature requires a customer-provided,
UL listed CSU in most locations of the U.S. In Canada, a CSA certified CSU/DSU is required.
T1 interface users also benefit from the increased quality and no loss nature of digital
transmission. Access to the T1 interface is completely transparent to station users. With DK424i
and the DK40i (Release 4.3 and higher), RDTU2 PCBs supports features that require the hook-
flash signal on T1 DID/DOD/Tie circuits.
Tandem CO Line Connections
This feature enables unattended line-to-line connections for the Strata DK, freeing the
conferencing analog station or voice mail port for other calls and important tasks (see Table 38 on
Page 95 for feature system capacities).
♦ DK14 enables up to two tandem connections
♦ DK40i enables up to three tandem connections
♦ DK424i enables up to 10 tandem connections
When a tandem connection is set up with a [DN] only, the [DN] must appear on the originating
DKT or EKT.
Standard telephones and/or VM devices can establish tandem analog CO line connections and then
release them without disconnecting the tandem connection in the DK424i. After releasing from
tandem call, reconnecting to the call can be accomplished by dialing an access code. This feature
does not work if one or both of the CO lines are digital. With DK14 and DK40i, standard
telephones and VM ports that set up a tandem CO line connection cannot release from the
connection.
Tandem CO line volume level depends on the volume loss level of the Telephone Network CO
lines (See “Amplified Conference Interface (DK40i, DK424i only)” on Page 66).
Tenant Service
Businesses in the same office building can share a system.
♦ DK14 and DK40i each support up to two tenants
♦ DK424i supports up to four tenants
Tenants can have separate LCR and Toll Restriction plans, Page Groups/Zones, Night Transfer
ringing assignments, and flexible door phone and CO line ringing assignments.