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voip to analog conversion

   I install gas correctors with modems that have traditionally communicated over a POTS line.  With most businesses going voip we are having difficulty  communicating with devices even with the cisco 186 & 187 ATA boxes.  The apparent problem is low current (miiliamps).  The manufacter of the corrector (Mercury-Honeywell) requires 23 to 35 milliamps and the reading I get out of the cisco box is 8-9 milliamps.  Is this typical.  I am not an IT person just a  tech for a utility trying to fix a problem without having the customer installing a POTS line.  Thanks.  Rob            

1 Accepted Solution

Accepted Solutions

paolo bevilacqua
Hall of Fame
Hall of Fame

The ATA should be providing 25 mA loop curent:

http://www.cisco.com/en/US/docs/voice_ip_comm/cata/186_188/2_15_ms/english/administration/guide/mgcp/mgcpaapg.html

If  that is not enough, you can try a loop current booster like

http://www.sandman.com/longloop.html

Measuring the loop current is a problem in itself, see article about it on the same site.

You can also look at a VG202, again with 25 mA of loop current:

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6790/gatecont/ps2250/ps5516/product_data_sheet09186a00801d87f6.html

Finally, for an high loop current device, you can use the VIC3-2FXS-E/DID

http://www.cisco.com/en/US/prod/collateral/modules/ps5365/product_data_sheet0900aecd801c595e_ps282_Products_Data_Sheet.html

This has to be used within a router.

View solution in original post

1 Reply 1

paolo bevilacqua
Hall of Fame
Hall of Fame

The ATA should be providing 25 mA loop curent:

http://www.cisco.com/en/US/docs/voice_ip_comm/cata/186_188/2_15_ms/english/administration/guide/mgcp/mgcpaapg.html

If  that is not enough, you can try a loop current booster like

http://www.sandman.com/longloop.html

Measuring the loop current is a problem in itself, see article about it on the same site.

You can also look at a VG202, again with 25 mA of loop current:

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6790/gatecont/ps2250/ps5516/product_data_sheet09186a00801d87f6.html

Finally, for an high loop current device, you can use the VIC3-2FXS-E/DID

http://www.cisco.com/en/US/prod/collateral/modules/ps5365/product_data_sheet0900aecd801c595e_ps282_Products_Data_Sheet.html

This has to be used within a router.

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