Cisco Cisco Packet over SONET Port Adapters Data Sheet
Data Sheet
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Packet-over-E3 Port Adapter Modules
Cisco 7200, 7301, 7304, 7500, and 7600 Series
CISCO’S PA-E3 AND PA-2E3 PACKET-OVER-E3 PORT ADAPTERS FOR THE CISCO 7200, CISCO 7301, CISCO 7304,
CISCO 7500, AND CISCO 7600 SERIES ROUTERS
Cisco’s PA-E3 and PA-2E3 Packet-over-E3 port adapters for the Cisco 7200, Cisco 7301, Cisco 7304, Cisco 7500, and
Cisco 7600 Series router offer high-density, highly manageable E3 line termination. Demand for high- capacity
corporate backbones, high- speed access to the global Internet, and trunking connections for service provider
internetworking has led to growth in clear-channel E3 con- nections that has outpaced all other types and speeds of
leased lines. This growth has placed tremendous strains on the abilities of service providers and network managers
to provision and manage new E3 connections. With integrated line interface units data service units (DSUs) that
allow E3 lines to be directly terminated on a Cisco router, the Cisco PA-E3 and PA-2E3 port adaptors simplify E3 line
management, reduce provisioning cost, and free valuable rack space.
E3 PORT ADAPTERS SIMPLIFY E3 LINE CONNECTIVITY
To support the widest range of operational environments and to offer the greatest flexibility in provisioning clear- channel E3 connections,
the PA-E3 and PA-2E3 port adapters take a groundbreaking step and bring together proprietary subrate and scrambling features of E3 DSU
vendors Digital Link, Larscom, and ADC Kentrox. Subrate support in the PA-E3 and PA-2E3 port adapters maximizes the application of
these products in service provider environments for tiered DS3 services. By simultaneously supporting interoperability with a wide range
of third-party DSU vendors, the PA-E3 and PA-2E3 port adapters offer the flexibility to support installed equipment without locking
customers into a proprietary solution.
The PA-E3 and PA-2E3 one- and-two port E3 port adapters provide direct connectivity to E3 lines for full- duplex communications at the
E3 rate of 34.368 MHz. Each E3 port consists of a pair of 75-ohm BNC coaxial connectors, one for transmit data and one for receive data,