Aastra 470, Системное руководство, Страница: 51 / 250

Expansion Stages and System Capacity
51
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
3. 3. 2. 1 Trunk cards
The trunk cards contain interfaces for connection to the analogue public network
(PSTN), the digital public network (ISDN) or for networking systems to create a pri-
vate telephony network (PISN). The trunk cards can be used and operated on any
slots for interface cards.
The trunk cards contain either FXO interfaces (FXO: Foreign Exchange Office), PRI
interfaces (PRI: Primary Rate Interface) or BRI interfaces (BRI: Basic Rate Interface).
BRI cards contain both network interfaces (BRI-T) and terminal interfaces (BRI-S).
On the BRI cards 4 interfaces can be individually configured to BRI-S or BRI-T.
Tab. 23 Trunk cards
Type
Network inter-
faces per card Max. number of
cards per system
Remarks
1PRI 1
×
PRI 7
1)
1)
1 fewer card if CPU2 application card is fitted
• Can be fitted with 1 IP media module
• Contains 30 B channels
• 10 B channels can be used licence-free
2PRI 2
×
PRI 7
1)
• Can be fitted with 2 IP media modules
• Contains 2
×
30B channels
• 2
×
10 B channels can be used licence-free
4BRI 4
×
BRI-T 7
1)
• All interfaces configurable to BRI-S
8BRI 8
×
BRI-T 7
1)
• Four fixed BRI-T interfaces
• 4 BRI-T interfaces configurable to BRI-S
4FXO
2)
2)
The availability of the FXO trunk cards depends on the sales channel.
4
×
FXO 7
1)
• 1 call charge module can be fitted for 4 ports
8FXO
2)
8
×
FXO 7
1)
• 1 call charge module can be fitted for 8 ports