Table Of Contents
Installing High-Speed Serial Interface Cables
Product Numbers: CAB-HSI1(=), CAB-HNUL(=)
This document describes how to install High-Speed Serial Interface (HSSI) cables for Cisco 7000 series, Cisco 7200 series (including a Cisco 7206 as a router shelf in a Cisco AS5800 Universal Access Server), Cisco 7400 series Internet routers, Cisco 7500 series routers, and Cisco 4000 series routers; and Cisco uBR7200 series universal broadband routers.
These cables connect directly to the following hardware:
•PA-H and PA-2H port adapters—Used in the Cisco uBR7200 series universal broadband routers and the following Cisco 7000 family routers:
–Cisco 7200 series (including the Cisco 7206 used as a router shelf in a Cisco AS5800 Universal Access Server)
–Cisco 7400 series
–Cisco 7500 series
•HSSI Interface Processor (HIP)—An interface processor used in Cisco 7000 series and Cisco 7500 series routers
•NP-1HSSI—A network processor module used in Cisco 4500, Cisco 4500-M, Cisco 4700, and Cisco 4700-M routers
Use this document in conjunction with the following documents (at the following URLS):
•PA-H HSSI Port Adapter Installation and Configuration
•PA-2H Dual-Port HSSI Port Adapter Installation and Configuration
•High Speed Serial Interface (HSSI) Interface Processor (HIP) Installation and Configuration Guide
•Installing and Configuring HSSI Network Processor Modules in Cisco 4000 Series Routers
Note The Cisco 7206 can be used as a router shelf in a Cisco AS5800 Universal Access Server. The steps for installing HSSI cables on a Cisco 7200 series router and a Cisco 7206 router shelf are the same. The procedures that reference the Cisco 7200 series also apply to the Cisco 7206 router shelf, unless otherwise noted.
Sections in this publication include the following:
Each HSSI port on the HIP, PA-H, PA-2H, or NP-1HSSI uses a female, 50-pin, SCSI-II-type connector.
Caution Although the HSSI connector and the HSSI cable are similar to SCSI-II format, they are not identical. The HSSI cable specification is more stringent than that for SCSI-II. If you use a SCSI-II cable instead of an HSSI cable, proper operation cannot be guaranteed.
Two types of cables are available for use with a HSSI ports:
•HSSI cable (CAB-HSI1[=]) used to connect your router to an external DSU (and the HSSI network)
•Null modem HSSI cable (CAB-HNUL[=]) used to connect two routers back-to-back
Note For information on how to enable two routers for back-to-back operation, refer to the configuration notes for the HIP, PA-H, PA-2H, or NP-1HSSI.
HSSI Interface Cable
Figure 1 HSSI Interface Cable Connectors
Table 1 HSSI Interface Cable Pinouts
Signal Name + Side Pin No. - Side Pin No. Direction 1
SG (signal ground)
RT (receive timing)
CA (DCE available)
RD (receive data reserved)
LC (loopback circuit C)
ST (send timing)
SG (signal ground)
TA (DTE available)
TT (terminal timing)
LA (loopback circuit A)
SD (send data)
LB (loopback circuit B)
SG (signal ground)
5 (ancillary to DCE)
SG (signal ground)
5 (ancillary from DCE)
SG (signal ground)
1 Router is + side (DTE). DSU is - side (DCE).
Null Modem Cable
Figure 2 shows the HSSI null modem cable CAB-HNUL(=) (Part Number 72-0727-xx). Table 2 provides pinouts. The cable has a male DB-50 (SCSI) connector on each end. Refer to "Connecting the HSSI Cable" on page 4 for connection instructions.
Figure 2 Null Modem Cable Connectors
Connecting the HSSI Cable
Figure 3 Connecting an HSSI Cable to the HIP
Figure 4 Connecting an HSSI Cable to PA-H—Shown without Handle
Note PA-2H (not shown) has two HSSI ports and is otherwise identical to PA-H.
Figure 5 Connecting an HSSI Cable to NP-1HSSI
Connecting the Null Modem Cable
To connect two routers directly, back-to-back, connect the null modem cable between the HSSI ports in two separate routers. The two routers must be in the same location and can be two Cisco 4000 series routers, two Cisco 7000 series routers, two Cisco 7200 series routers, two Cisco 7500 series, two Cisco uBR7200 series universal broadband routers, two Cisco 7400 series Internet routers, or any two routers of each router series listed. With a null modem connection, you can verify the operation of the HSSI or to link the routers directly in order to build a larger node.
Figure 6 Connecting a Null Modem Cable to the HIP
Figure 7 Connecting a Null Modem Cable to the NP-1HSSI
Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems.
You can access the most current Cisco documentation at this URL:
You can access the Cisco website at this URL:
You can access international Cisco websites at this URL:
You can find instructions for ordering documentation at this URL:
You can order Cisco documentation in these ways:
•Registered Cisco.com users (Cisco direct customers) can order Cisco product documentation from the Ordering tool:
•Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters (California, USA) at 408 526-7208 or, elsewhere in North America, by calling 800 553-NETS (6387).
You can send comments about technical documentation to firstname.lastname@example.org.
You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address:
Attn: Customer Document Ordering
170 West Tasman Drive
San Jose, CA 95134-9883
We appreciate your comments.
Obtaining Technical Assistance
For all customers, partners, resellers, and distributors who hold valid Cisco service contracts, Cisco Technical Support provides 24-hour-a-day, award-winning technical assistance. The Cisco Technical Support Website on Cisco.com features extensive online support resources. In addition, Cisco Technical Assistance Center (TAC) engineers provide telephone support. If you do not hold a valid Cisco service contract, contact your reseller.
Cisco Technical Support Website
The Cisco Technical Support Website provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The website is available 24 hours a day, 365 days a year at this URL:
Access to all tools on the Cisco Technical Support Website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register at this URL:
Submitting a Service Request
Using the online TAC Service Request Tool is the fastest way to open S3 and S4 service requests. (S3 and S4 service requests are those in which your network is minimally impaired or for which you require product information.) After you describe your situation, the TAC Service Request Tool automatically provides recommended solutions. If your issue is not resolved using the recommended resources, your service request will be assigned to a Cisco TAC engineer. The TAC Service Request Tool is located at this URL:
For S1 or S2 service requests or if you do not have Internet access, contact the Cisco TAC by telephone. (S1 or S2 service requests are those in which your production network is down or severely degraded.) Cisco TAC engineers are assigned immediately to S1 and S2 service requests to help keep your business operations running smoothly.
To open a service request by telephone, use one of the following numbers:
Asia-Pacific: +61 2 8446 7411 (Australia: 1 800 805 227)
EMEA: +32 2 704 55 55
USA: 1 800 553 2447
For a complete list of Cisco TAC contacts, go to this URL:
Definitions of Service Request Severity
To ensure that all service requests are reported in a standard format, Cisco has established severity definitions.
Severity 1 (S1)—Your network is "down," or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.
Severity 2 (S2)—Operation of an existing network is severely degraded, or significant aspects of your business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.
Severity 3 (S3)—Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.
Severity 4 (S4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations.
Obtaining Additional Publications and Information
Information about Cisco products, technologies, and network solutions is available from various online and printed sources.
•Cisco Marketplace provides a variety of Cisco books, reference guides, and logo merchandise. Visit Cisco Marketplace, the company store, at this URL:
•The Cisco Product Catalog describes the networking products offered by Cisco Systems, as well as ordering and customer support services. Access the Cisco Product Catalog at this URL:
•Cisco Press publishes a wide range of general networking, training and certification titles. Both new and experienced users will benefit from these publications. For current Cisco Press titles and other information, go to Cisco Press at this URL:
•Packet magazine is the Cisco Systems technical user magazine for maximizing Internet and networking investments. Each quarter, Packet delivers coverage of the latest industry trends, technology breakthroughs, and Cisco products and solutions, as well as network deployment and troubleshooting tips, configuration examples, customer case studies, certification and training information, and links to scores of in-depth online resources. You can access Packet magazine at this URL:
•iQ Magazine is the quarterly publication from Cisco Systems designed to help growing companies learn how they can use technology to increase revenue, streamline their business, and expand services. The publication identifies the challenges facing these companies and the technologies to help solve them, using real-world case studies and business strategies to help readers make sound technology investment decisions. You can access iQ Magazine at this URL:
•Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL:
•World-class networking training is available from Cisco. You can view current offerings at this URL:
Copyright ©1996- 2004, Cisco Systems, Inc.
All rights reserved.