Expansion Stages and System Capacity
58
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
3. 3. 1. 3 Call charge modules
Optional call charge modules are available for detecting charge pulses on analogue
network interfaces.
Fig. 14 Design of call charge modules
Call charge modules are fitted to FXO cards. The call charge modules available match
the number of ports on the FXO cards. Only 1 call charge module can be fitted to each
FXO card.
Tab. 25 Call charge modules
3. 3. 2 Interface cards
Interface cards are fitted from the front into one of a total of 7 expansion slots (see "Fit-
ting interface cards", page 106). Interface cards can be assigned to two categories:
• Trunk cards
These cards provide interfaces for connection to public dial-up networks or for net-
working systems to create a private telephony network.
• Terminal cards
These cards provide interfaces for connecting digital and analogue voice and data
terminals.
On some BRI cards a part of the interfaces are configurable (BRI-S/T). This means
that these cards cannot be clearly assigned to any particular category. They are listed
both among the trunk cards and the terminal cards.
Up to 2 IP media modules can be fitted on PRI cards.
Type
Number of modules per
4FXO trunk card
Number of modules per
8FXO trunk card
Number of modules per
16FXO trunk card
4TAX
1)
1) The availability of the call charge modules depends on the sales channel.
1––
8TAX
1)
–1–
16TAX
1)
––1
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