Toshiba Strata CTX100 User Manual

ISDN service comes in two forms: 

•

Primary Rate Interface (PRI) supports simultaneous voice or data connections (eight, 16 or 
23). PRI is similar to digital T1 service and uses two pairs of wires from your phone company. 
The RPTU PCB supports PRI on the Strata CTX.

•

Basic Rate Interface (BRI) supports up to two simultaneous connections using a single pair of 
wires. The Strata CTX BRI cards support both station side and trunk side connections. Strata 
CTX systems also support BRI interface from the public network as a CO line service. There 
are two types of ISDN BRI interfaces: S/T type (via RBSU/RBSS) and the 
U-type (via RBUU/RBUS).

Least Cost Routing chooses the most appropriate route over which to connect an outgoing call 
based on the following:

•

Dialed Digits

•

Time of Day

•

Type of Day (Business, Weekend, Holiday)

•

LCR group of the caller

The combination of routing tables, indices, route definitions and time-of-day qualifiers can 
produce up to 75 million combinations. Routing changes automatically for each type of day, 
according to the time of day. This schedule is independent of the Day/Night mode schedule which 
applies to ringing and CO assignments.

Telephone buttons that are used for making and receiving outside calls are referred to as 

/LQH

 (or 

&2/LQH

) buttons. (For information on various [DN] buttons, refer to 

“Directory Numbers” on 

page 51

.) The Strata CTX supports the following types of line buttons:

Smaller systems have traditionally provided the direct appearance of the CO lines on the 
telephones where maximum visibility of the line status, flexible ringing assignments, and informal 
call transfers associated with key telephone systems may be implemented. 

Pooled Line Group buttons enable a group of CO lines to “appear” under one button. Pooled and 
single appearing line buttons are designed for use with loop and ground start lines, not Tie, DID, 
DNIS or ANI lines.

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