13-2
Cisco Network Modules Hardware Installation Guide
OL-2485-20
Chapter 13 Connecting HSSI Network Modules
Connecting HSSI Modules to the Network
•
To another router for back-to-back operation, using a HSSI null modem cable. (See
Figure 13-3
.)
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
EN
11710
HSSI port
External DSU
HSSI DTE cable
HIGH SPEED SERIAL
1HSSI
HSSI 0
TD
TC
RD
RC
LB/CN