Connecting HSSI Network Modules to a Network 13-5
HSSI Network Module LEDs
Figure 13-4 HSSI Network Module LEDs
All network modules have an enable (EN) LED. The enable LED indicates that the module
has passed its self-tests and is available to the router. The HSSI network module has the
additional LEDs shown in Table 13-1.
Table 13-1 HSSI Network Module LEDs
LED Meaning
LB/C (Loopback/Connect) Green indicates normal operation. The module is connected to the external DSU
1
, and
the signals TA (DTE
2
available) and CA (DCE
3
available) are active.
Yellow indicates that the module is in loopback mode.
If this LED is off, the port is neither connected to the DSU nor in loopback mode.
1 DSU = data service unit.
2 DTE = data terminal equipment.
3 DCE = data communications equipment.
RC (Receive Clock) Module has detected a receive clock signal. During normal operation, this signal is
received from the external DSU. During loopback, it is generated internally.
RD (Receive Data) Module has detected a receive clock signal. During normal operation, this signal is
received from the external DSU. During loopback, it is generated internally.
TC (Transmit Clock) Module is transmitting a clock signal to the external DSU. During normal operation,
this signal is derived from the DSU’s RT signal. During loopback, it is generated
internally.
TD (Transmit Data) Module has been detected by and can send packets to the external DSU.
EN
HIGH SPEED SERIAL
1HSSI
11712
HSSI 0
Enable LED
HSSI port LEDs
TD
TC
RD
RC
LB/CN
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