Hssi Connections - Cisco 7000 Hardware Installation And Maintenance

HSSI Connections

The HIP HSSI port functions as a DTE when it is connected to a DSU for a standard HSSI
connection, and it can also be connected to a collocated router with a null modem cable. To connect
the router to a HSSI network, use a HSSI interface cable between the HIP port and the DSU. Both
ends of the HSSI interface cable are the same, so you can connect either end to the HIP or DSU.
(See Figure 3-19.)
Figure 3-19
To
network
To connect two routers back to back in order to verify the operation of the HSSI port or to build a
larger node, use a null modem cable between available HSSI ports in two separate routers.
(See Figure 3-20.) The two routers must be in the same location, and can be two Cisco 7000s, two
AGS+ routers, or one of each. When you configure the ports, you must enable the internal transmit
clock on in the HSSI interface in both routers with the command hssi internal-clock. To negate the
command when you disconnect the cable, use the command no hssi internal-clock. For complete
command descriptions and instructions, refer to the related software documentation.
Figure 3-20
I
HSSI Network Connection
T3, E3, or
Sonet DSU
HSSI Modem Connection
I
Connecting Interface Cables
Installing the Router 3-139