Specifications

CHAPTER
Overview 1-1
1
Overview
This chapter provides physical and functional overviews of the PA-H HSSI port adapter. The chapter
contains the following sections:
• Port Adapter Overview, page 1-1
• Port Adapter Locations on the Supported Platforms, page 1-3
• LEDs, page 1-6
• Receptacles, Cables, and Pinouts, page 1-7
Port Adapter Overview
The PA-H Rev. B HSSI port adapter provides one high-speed serial interface. (See Figure 1-1.)
Figure 1-1 PA-H Rev. B Port Adapter—Faceplate View
The PA-H HSSI port is a female, 50-pin, SCSI-II-type connector. You must use a HSSI interface
cable to connect the interface with an external data service unit (DSU). See the “Receptacles, Cables,
and Pinouts” section on page 1-7 for descriptions of HSSI cables.
The PA-H conforms to BABT/TC/130 and EIA/TIA-612 and EIA/TIA-613 standards. The PA-H
provides a single network interface for Cisco 7000 series, Cisco 7500 series, Cisco 7200 series
routers (including a Cisco 7206 and Cisco 7206VXR as router shelves in a Cisco AS5800 Universal
Access Server), Cisco uBR7200 series universal broadband routers, and Cisco 7100 series routers.
Each PA-H provides a full-duplex synchronous serial interface for transmitting and receiving data at
rates of up to 52 megabits per second (Mbps).
HSSI, which was recently standardized as EIA/TIA 612/613, provides access to services at T3
(45-Mbps), E3 (34-Mbps), and Synchronous Optical Network (SONET) STS-1 (51.82-Mbps) rates.
The actual rate of the interface depends on the external data service unit (DSU) and the type of
service to which it is connected.
The PA-H supports both 16- and 32-bit cyclic redundancy checks (CRCs). The default is 16-bit
CRCs; to enable 32-bit CRCs, you use a configuration command. (For a description of the CRC
function, see the “Configuring Cyclic Redundancy Checks” section on page 8-8.)
ENABLED
TD TC RD RC LB/C
0
HSSI
Rev. B
H10419