Table Of Contents
Connecting Cisco HSSI Network Modules to the Network
Revised: May 1, 2008, OL-12817-01
This guide describes how to connect Cisco High-Speed Serial Interface (HSSI) network modules to your network. It contains the following sections:
HSSI Network Modules
The 1-port High-Speed Serial Interface (HSSI) network module (see Figure 1) provides connectivity for fractional DS3 rate links and slower.
Figure 1 HSSI Network Module
Connecting HSSI Modules to the Network
The HSSI module contains a 50-pin receptacle, color-coded blue. You can connect this port to a network in either of two ways:
•To an external data service unit (DSU), using a HSSI data terminal equipment (DTE) cable for operation in DTE mode (see Figure 2). The HSSI port is configured to operate in this mode by default.
•To another router for back-to-back operation, using a HSSI null modem cable. (See Figure 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 2 Connecting the 1-Port HSSI Module to an External DSU
Figure 3 Connecting Two Routers Back to Back
HSSI Network Module LEDs
All network modules have an enable (EN) LED. The enable LED indicates that the module has passed its self-tests and is available to the router. The HSSI network module has the additional LEDs shown in Figure 4 and described in Table 1.
Figure 4 HSSI Network Module LEDs
For additional information, see the following documents and resources.
Related Topic Document Title
Regulatory compliance and safety information
Cisco Network Modules and Interface Cards Regulatory Compliance and Safety Information
Cisco IOS software website and reference documentation
Cisco IOS Software http://www.cisco.com/web/psa/products/index.html?c=268438303
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