Verilink C100 (880-502893-001) Product Manual - Manual (Page 43)

LED Indicators and Diagnostics
6/15/99 C100 and C150 T1/FT1 CSU/DSU 4-3
CI Chan DSR The CI Channel DSR (Data Set Ready) LED is lit whenever CI Channel
DSR to the customer equipment is spacing. The color of this LED is
green.
CI Chan CD The CI Channel CD (Carrier Detect) LED is lit whenever pin 8 on the
CI Channel interfaces to the customer equipment is spacing. The colo
of this LED is green.
CI Chan DTR The CI Channel DTR (Data Terminal Ready) LED is lit whenever CI
Channel DTR from the customer equipment is spacing. The color of
this LED is green.