Datasheet

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TwinGig modules convert a single X2 port into two Gigabit Ethernet SFP ports.
Figure 1. TwinGig Module
Cisco Catalyst 4500E Series Gigabit Ethernet Fiber Line Cards
The Cisco Catalyst 4500E Series 24-port Gigabit Ethernet fiber line card (SFP based) and Cisco Catalyst 4500E
Series 12-port Gigabit Ethernet fiber line card (SFP based) provide high-performance switching at 24 Gbps per slot
(line rate). Both E-Series line cards are nonblocking and designed for high-performance 1 Gigabit Ethernet
aggregation in the campus and to support Fiber to the Desktop (FTTD) applications.
The Cisco Catalyst 4500 Series offers oversubscribed Gigabit Ethernet fiber line cards optimized for FTTD and
FTTH deployments. The Cisco Catalyst 4500 Series 48 module Gigabit line card (8:1 oversubscribed) provides
switching at 6Gbps per slot and can be used for higher density deployments.
The Cisco Catalyst 4500E Series 40 module Gigabit line card (2:1 oversubscribed) provides switching at 24Gbps
per slot and can be used for enterprise deployments that require higher density and lower oversubscription. This
line card also supports a specialized BX optics (compact SFP) that doubles the density to 80 ports per line card
using 40 module, making it attractive for the FTTH deployment. The CSFP is a dual bidirectional SFP type that has
the same form factor as a regular SFP, but can support 2 users that use BX type of optics (Figure 2).
Figure 2. Compact SFP