It should be no problem assuming your cable infrastructure is decent with no bridgetaps or electrical interference, etc.
There is a command to adjust cable length from NIU:
Router(config-if)# service-module t1 cablelength short {110ft |220ft |330ft |440ft | 550ft |660ft}
Also consider service-module t1 lbo command. The rule for T1 extension is no more than 660ft and no more then -15db loss.
Brandon
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