Cisco 20-1GE-FLEX Interface Card Adapter Computer Component

The Cisco CRS-1 Series 20-Port Gigabit Ethernet Flexible Interface Module (Figure 1) provides 20 ports of IEEE 802.3-compliant Gigabit Ethernet interfaces and two available Cisco I-Flex shared port adapter (SPA) slots. By providing service intelligence, modularity, and configuration flexibility with fully compatible SPAs, the Cisco I-Flex design offers carriers long-term savings and the ability to handle evolving service delivery requirements, such as SONET-to-Ethernet.
The SPAs can be a mix of Ethernet or Packet over SONET/SDH (POS), and are identical to the SPAs used in other Cisco platforms such as the Cisco XR 12000 Series and the Cisco CRS Carrier Routing System. Gigabit Ethernet physical interface characteristics can be selected using different modular Small Form-Factor Pluggable (SFP) optics - short, long, extra long, and copper interfaces are supported. Extensive per-port and per-VLAN counters simplify network performance monitoring and troubleshooting.