Instruction manual

Strata DK424i
ISDN BRI CIrcuit Capacity Guidelines
Strata DK General Description 6/00 27
ISDN BRI CIrcuit Capacity Guidelines
The tables in this section show the maximum capacities for ISDN BRI circuits using RBUU/
RBUS and/or RBSU/RBSS PCBs. Guidelines 1~7 below apply to Tables 20~23.
1. Each BRI circuit can be configured to support either one BRI (TE or TA) ISDN station; or two
ISDN line channels.
2. A maximum of eight BRI circuits may be used as BRI line circuits to connect to the ISDN
Central Office. Each circuit provides two CO line channels to the DK424i.
3. Each BRI circuit (S/T and/or U-type) provides two B channels plus one D channel and reduces
the system capacity by two station ports and two CO lines, regardless of how it is configured
(line or station). Each (S/T) BRI station circuit allows up to two TE-1 and TA devices to share
the BRI B channels (two simultaneous calls maximum per BRI circuit.). Each BRI-U station
circuit supports one TE-1 or TA device.
4. In Tables 20~23, other stations include Toshiba digital and electronic telephones, or attendant
consoles, standard telephones and devices.
5. In Tables 20~23, other lines include analog and digital (T1 or PRI) loop start, ground start,
DID, and Tie lines.
6. RBSS can only be used for BRI stations. All other BRI PCBs can be configured as line or
station BRI circuits.
7. Some configurations require T1 or PRI lines to reach the maximum configuration.
Table 20 B1CU Maximum ISDN BRI Configuration
B1CU
1-Cabinet
8-Universal Slots
56-Stations Max.
32-CO Lines Max.
64-Stations + Lines Max.
BRI Circuits
(2B + 1D channel each)
Other Stations &
Lines Combined
(see Guidelines 4 & 5)
14 8
12 16
10 24
832
640
448
256
064