Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 200

Connecting HSSI Modules to the Network
To another router for back-to-back operation, using a HSSI null modem cable. (See
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Both routers must be at the same site. Back-to-back operation allows you to verify operation of the
HSSI port or link routers directly to build a larger node. Both routers must be configured to use a
51.84-MHz internal clock.
Figure 13-2 Connecting the 1-Port HSSI Module to an External DSU
HSSI DTE cable
Cisco Network Modules Hardware Installation Guide
13-2
HIGH SPE ED SER IAL
1HS SI
Chapter 13 Connecting HSSI Network Modules
HSSI port
External DSU
Figure 13-3.)
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