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Cisco 7600 Series Ethernet Services Plus Line Card Hardware Installation Guide
OL-16146-10
Chapter 2 Overview: Cisco 7600 Series Ethernet Services Plus Line Cards
Cisco 76-ES+XT-8TG Line Card Overview
• Port Mapping: The ES+ HD has eight 10GE ports. The first port of each NP is numbered from 1 to
4 (NP 0 to NP 3), and each NP’s second 10GE port is numbered from 5 to 8.
• Oversubscription: Theoretically each NP supports 15Gb on the egress side. For instance, 10Gb
traffic is sent from the line card to NP, which has 5Gb of multicast and 5Gb of unicast traffic. Using
loopback interface, the NP replicates the multicast packets and sends 5Gb traffic on each NP port.
This traffic is divided into 2.5Gb on each port. So, effectively each NP port or interface receives
7.5Gb traffic. Since there are two 10Gb ports on each NP, the total rate achieved is 15Gb.
On the ingress path, more than 10Gb is supported for higher packet size. For instance, when the NP
receives the packets at the rate of 10Gb, and each packet size is 64 bytes, it will be 96 bytes (64 +32
byte DBUS header) when it moves from NP to line card. So, it consumes entire bandwidth and
restrict the ingress traffic to 10Gb. If the packet size is greater than 64 bytes, it will give more than
10Gb throughput.
Cisco 76-ES+T-8TG Supported SFP+ Modules
The Cisco 76-ES+T-8TG line cards support the enhanced small form-factor pluggable (SFP+) optical
transceiver modules listed in Table 2-78.
Cisco 76-ES+XT-8TG Line Card Overview
The following sections describe the Cisco 76-ES+XT-8TG line cards:
• Cisco 76-ES+XT-8TG Line Card Processors, page 2-77
• Cisco 76-ES+XT-8TG Line Card LEDs, page 2-78
• Cisco 76-ES+XT-8TG Physical Specifications, page 2-78
• Cisco 76-ES+XT-8TG Line Card Memory Options, page 2-79
• Cisco 76-ES+XT-8TG Supported SFP+ Modules, page 2-79
Cisco 76-ES+XT-8TG Line Card Processors
The processors on the Cisco 76-ES+XT-8TG line card are listed in Table 2-79.
Table 2-78 Cisco 76-ES+T-8TG Supported SFP+ Modules
SFP+ Modules Description
SFP-10G-SR-X 10GE SFP+, Short range.
SFP-10G-LR-X 10GE SFP+, Long range.