Cisco 7000 Hardware Installation And Maintenance page 56

Physical Description
•
•
•
•
For complete descriptions of the LED states, refer to the appendix "Reading LED Indicators."
Figure 1-21
The HIP interface port is a 50-pin, SCSI-II-type receptacle. You need a HSSI interface cable to
connect the HIP with an external DSU. Although the HSSI port and cable are physically similar to
SCSI-II format, the HSSI specification is more stringent than that for SCSI-II, and we cannot
guarantee reliable operation if a SCSI-II cable is used.
A null modem cable allows you to connect two collocated routers back to back to verify the
operation of the HSSI interface or to build a larger node by linking the routers directly. For a
description of HSSI network and null modem connections, refer to the section "HSSI Connections"
in the chapter "Installing the Router." The appendix "Cabling Specifications" provides connector
pinouts and cable assembly drawings.
1-52 Cisco 7000 Hardware Installation and Maintenance
RT (Receive Timing)—Lights to indicate that the HIP has detected a receive clock signal. During
normal operation, this signal is received from the external DSU. During loopback, this signal is
generated internally.
RD (Receive Data)—Lights when the HIP detects packet traffic and indicates that the HIP is able
to receive packets from the external DSU.
ST (Send Timing)—Lights to indicate that the HIP is sending a transmit clock signal to the
external DSU. During normal operation, this signal is derived from the receive timing (RT) signal
from the external DSU. During loopback, this signal is generated internally.
C (connected)—Lights to indicate normal operation; the HIP is properly connected to the
external DSU, and TA (DTE available) and CA (DCE available) are active. This LED does not
light when the HIP is in loopback mode nor when it is not connected to the DSU.
High-Speed Serial (HSSI) Interface Processor (HIP)
Captive installation screw
RT
RD
ST
C
3
U 1 3