Specifications

Attaching a Null Modem Cable to PA-H HSSI Port Adapters
PA-H HSSI Port Adapter Installation and Configuration
8-2
8-2
Figure 8-1 Connecting HSSI Cables
Note Port adapters have a handle attached, but it is not shown in Figure 8-1 to allow a
full view of the detail on each port adapter’s faceplate.
Step 2 Attach the network end of your HSSI cable to your T3 or E3 DSU or to other external
HSSI equipment.
Attaching a Null Modem Cable to PA-H HSSI Port Adapters
The null modem cable can connect two routers directly back to back. The two routers must be in the
same location, and can be two Cisco 7000 series routers, two Cisco 7500 series routers, two
Cisco 7200 series routers, two Cisco uBR7200 series universal broadband routers, two Cisco 7100
series routers, or one of each. This setup allows you to verify the operation of the HSSI or to directly
link the routers to build a larger node. The null modem cable uses the same 50-pin connectors as the
HSSI cable, but uses the pinouts listed in Table 1-3 on page 1-9.
To connect two routers, attach a null modem cable between a HSSI port on each router. Enable the
internal transmit clock in both routers by entering the command hssi internal-clock. All router
platforms use the same hssi internal-clock command to enable the internal transmit clock on the
HSSI.
You define Cisco 7000 series and Cisco 7500 series interfaces by type and physical slot/port
adapter/port locations. You define Cisco 7200 series, Cisco uBR7200 series, and Cisco 7100 series
interfaces by type and port adapter slot number/port locations. You define the Catalyst RSM/VIP2
in the Catalyst 5000 family switches. (The output of the show interfaces command displays the
logical unit number on all supported platforms and the physical slot/port adapter/port location in
Cisco 7000 series and Cisco 7500 series router, or the port adapter slot number/port location in
Cisco 7200 series, Cisco uBR7200 series, Cisco 7100 series routers, and the Catalyst RSM/VIP2.)
H10422
HSSI cable
To T3, E3, or SONET DSU
ENABLED
TD TC RD RC LB/C
0
HSSI
Rev. B