Cisco 1700 T1 clocking question

[macphoneguy]

couple of facts in the way of backround
I have two phone systems with a T1 module card in them,
I have two cisco 1700's that I want to use to connect the systems,
the systems have a option for turning Clocking on or off, (currently 1 is on and 1 is off)
what command would be used on the router so it would sync with the phone system,
the two routers are connected Via fiber optic ethernet media converters

thanks in advance

 

[ISPKing]

Router(config)# int s0/1
Router(config-if)# service-module t1 clock source line

This is the default. Type internal if you want the csu to control the clocking

CCNP

 

[macphoneguy]

since the two 1700's would be back to back ethernetwise one would be clock source line & the other would be clock source internal ?