maimum FXO on a Voice Gateway

rami_azar · ‎01-26-2008

In the data sheets and documents,it is stated that the maximum number of FXO that a router can support is 36 on a cisco3845 .

Actually a 3845 router can support 4 cards and 4 network modules,then theoratically we can put four vic2-4FXO and four NM-HV2 with two vic2-4fxo each .

in total we get 12 vic2-4fxo whcih is 48 FXOs.

can someone please explain to me if a 3845 can really support 48 FXOs ,and if not why ?

than you

paolo bevilacqua · ‎01-26-2008

Hi, at some point, it becomes very complicated and expensive to do such a config for maximum FXO.

If you have no other choice than use FXO to telco, why don't you use a channel bank that converts from fxo to E1 CAS.

For example, with two channel banks you can terminate 60 FXO, taking a simple VWIC or VWIC2 module in the router, even a 2801 would do that then.

philippe.cousineau · ‎03-30-2011

For a 2811

IP Telephony Support-Features and Benefits

The Cisco 2800 Series allows network managers to provide scalable analog and digital telephony without investing in a one-time solution (refer to Table 4 for more detail), allowing enterprises greater control of their converged telephony needs. Using the voice and fax modules, the Cisco 2800 Series can be deployed for applications ranging from voice-over-IP (VoIP) and voice-over-Frame Relay (VoFR) transport to robust, centralized solutions using the Cisco Survivable Remote Site Telephony (SRST) solution or distributed call processing using Cisco Call Manager Express (CME). The architecture is highly scalable with the ability to connect up to 12 T1/E1s trunks, 52 foreign-exchange-station (FXS) ports, or 36 foreign-exchange-office (FXO) ports.

http://www.cisco.com/en/US/customer/prod/collateral/routers/ps5854/ps5882/product_data_sheet0900aecd8016fa68_ps5854_Products_Data_Sheet.html