Cisco 7000 Hardware Installation And Maintenance page 52

Physical Description
Figure 1-18
translations for
CONN=CONN
The following LED state descriptions include the meanings for both DTE and DCE interfaces. The
signals indicated for DTE interfaces correspond to the LED labels. However, the signals on DCE
interfaces travel in the opposite direction and do not correspond directly to the LED labels. Refer to
the LED labels for DTE interfaces and the translations for DCE signals shown in Figure 1-18 when
reviewing the LED state descriptions that follow:
•
•
•
•
1-48 Cisco 7000 Hardware Installation and Maintenance
Fast Serial Interface Processor (FSIP)
DTE
RxC
RxD
TxC
CONN
LEDs
DCE
LED state
DCE ports:
RxC=TxC RxC
RxD
RxD=TxD
TxC
TxC=RxC
CONN
Captive
installation
screw
RxC—On both DTE and DCE interfaces, this LED is on when the port is receiving an external
clock signal.
RxD (Receive Data)—On both DTE and DCE interfaces, this LED is on when the port is
receiving data signals (packets) from the network. This LED is also on when it detects an idle
pattern that is commonly sent across the network during idle time.
TxC (Transmit Clock)—On DTE interfaces, this LED is on when the port is sending the transmit
clock signal. On DCE interfaces, it indicates that the DCE is sending the TxC signal to the DTE.
Conn (connected or loopback)—On both DTE and DCE interfaces, this LED is on to indicate
normal operation: the FSIP is properly connected to the external device, and TA (DTE available)
and CA (DCE available) are active. When this LED is off, the FSIP is in loopback mode or is not
connected to the network or external device.
Captive Port
installation adapter
screw
Module 1,
ports 0–3
Module 2,
ports 4–7
PLCC socket with
microcode ROM
U 8 1