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Figure 1.
TwinGig Module
Cisco Catalyst 4500 E-Series and Classic Power over Ethernet Line Cards
The Cisco Catalyst 4500 Series offers line cards, power supplies, and accessories required to
deploy and operate a standards-based PoE internetwork. PoE provides –48 VDC power over
standard Category 5 unshielded twisted-pair (UTP) cable up to 100 meters when an IEEE 802.3af-
compliant or Cisco prestandard powered device is attached to the PoE line-card port. Instead of
requiring wall power, attached devices such as IP phones, wireless base stations, video cameras,
and other IEEE-compliant appliances can use power provided from the Cisco Catalyst 4500 Series
PoE line cards. This capability gives network administrators centralized control over power and
eliminates the need to install outlets in ceilings and other out-of-the-way places where a powered
device can be installed.
Although all references to "PoE," "inline power," and "voice" power supplies and line cards are
synonymous, there are currently only two versions: Cisco prestandard and IEEE 802.3af
compliant. Every Cisco Catalyst 4500 Series chassis and PoE power supply supports the IEEE
802.3af standard and the Cisco prestandard power implementation, helping ensure backward
compatibility with existing devices powered by Cisco. All IEEE 802.3af-compliant line cards can
distinguish an IEEE or Cisco prestandard powered device from an unpowered network interface
card (NIC), helping ensure power is applied only when an appropriate device is connected.
Cisco Catalyst 4500 Classic Fast Ethernet and Gigabit Line Cards
The Cisco Catalyst 4500 Series offers a variety of classic Fast Ethernet and Gigabit Ethernet line
cards that include fiber and copper interfaces optimized for desktops, branch office backbones,
and servers for enterprise and commercial switching solutions, and service provider metropolitan
Ethernet networks. Gigabit Ethernet line cards include cost-effective, high-performance
1000BASE-X gigabit interface converter (GBIC) and SFP-based Gigabit Ethernet line cards and
the high-density 10/100/1000BASE-T triple-speed autosensing, autonegotiating Gigabit Ethernet
line cards. Fast Ethernet line cards include various densities of wire-speed 10/100, 100-FX,
100BASE-LX10, and 100BASE-BX-D options.
Features and Benefits
Functionally Transparent
Cisco Catalyst 4500 Series switches offers an extensive line of modules that support numerous
speeds and physical media combinations. These line cards are functionally transparent; all the
packet processing, queuing, buffering, and QoS occur in the supervisor engine. To that end, both
classic and E-Series line cards acquire the features and capabilities of the installed supervisor
engine. For example, a classic line card previously deployed with a classic supervisor engine using
4 queues per port will automatically have capability for 8 queues per port (first half CY2008) if
redeployed with a Supervisor Engine 6-E. This architecture enables customers to easily upgrade
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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