Specifications

Configure a High-Speed Serial Interface
IC-68
Cisco IOS Interface Configuration Guide
Interface (RSP7000CI). The PA-H provides one high-speed synchronous serial interface, and the
PA-2H provides two high-speed synchronous serial interfaces that support full-duplex and data rates
up to 52 Mbps. For more information on the PA-H and PA-2H, refer to the PA-H and PA-2H HSSI
Port Adapter Installation and Configuration publication.
The Cisco 3600 series 1-port HSSI network module provides full-duplex connectivity at
Synchronous Optical Network (SONET) OC-1/STS-1 (51.840 Mhz), T3 (44.736 MHz), and E3
(34.368 MHz) rates in conformance with the EIA/TIA-612 and EIA/TIA-613 specifications. The
actual rate of the interface depends on the external data service unit (DSU) and the type of service
to which it is connected. This 1-port HSSI network module can reach speeds of up to 52 Mbps in
unidirectional traffic with 1,548-byte packets and 4,250 packets per second. Asynchronous Transfer
Mode (ATM), High-Level Data Link Control (HDLC), Point-to-Point Protocol (PPP), Frame Relay,
and Switched Multi-Megabit Data Service (SMDS) WAN services are all fully supported.
Before you configure the 1-port HSSI network module, complete the following prerequisite tasks:
• Install the HSSI Network Module in a chassis slot. For information on how to install this network
module, refer to the “Installing a 1-Port HSSI Network Module in a Chassis Slot” section in the
1-Port HSSI Network Module Configuration Note.
• Complete basic device configuration, including host name, username, protocol, and security
configuration. For more information about basic device configuration, refer to the Cisco 3620
Installation and Configuration Guide or the Cisco 3640 Installation and Configuration Guide.
HSSI Configuration Task List
Perform the tasks in the following sections to configure a HSSI interface. The first task is required;
the remaining tasks are optional.
• Specify a HSSI
• Specify HSSI Encapsulation
• Invoke ATM on a HSSI Line
• Convert HSSI to Clock Master
• Disable Fair Queueing
Specify a HSSI
To specify a HSSI and enter interface configuration mode, use one of the following commands in
global configuration mode:
Command Purpose
interface hssi number Begin interface configuration.
interface hssi slot/port Begin interface configuration for the Cisco 7500 series
routers.