The one that never shows errors is currently plugged in 2/1
Serial1/0 is up, line protocol is up
Hardware is QUICC with integrated T1 CSU/DSU
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 18/255, rxload 128/255
Encapsulation PPP, loopback not set...