Isdn Bri Circuit Capacity Guidelines - Toshiba STRATA DK14 Installation And Maintenance Manual

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
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 6-7~6-10, other stations include Toshiba digital and electronic telephones, or
attendant consoles, standard telephones and devices.
5. In Tables 6-7~6-10, 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 6-7 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)
14
12
10
8
6
4
2
0
Strata DK I&M 6/00
Other Stations &
Lines Combined
(see Guidelines 4 & 5)
8
16
24
32
40
48
56
64
ISDN BRI Circuit Capacity Guidelines
Tables
Table 6-8 B2CAU/B2CBU Maximum ISDN BRI
Configuration
B2CAU/B2CBU
2 Cabinets
14 Universal Slots
104 Stations Max.
120 CO Lines Max.
128 Stations + Lines Max.
BRI Circuits
(2B + 1D channel each)
30
26
22
18
14
10
6
2
0
DK424i Configuration
6-7~6-10.
Other Stations & Lines
Combined (see Guidelines
4 & 5 on 6-7)
8
24
40
56
72
88
104
120
128
6-7