EMC Connectrix B Series Hardware Reference Manual page 18

Overview
World Wide Name (WWN) card on the nonport side, to maintain
chassis-specific information such as WWNs, IP addresses, and
summary status information of each port blade assembly and
power supply through LEDs
Redundant AC primary power connections to allow two primary
power connections for higher availability
Supports up to eight of the following port blades:
• 16-port 2-Gbit/sec port blade (FC2-16)
• 16-port 4-Gbit/sec port blade (FC4-16)
• 32-port 4-Gbit/sec port blade (FC4-32)
• 48-port 4-Gbit/sec port blade (PB-48K-48)
• 18-port, 16 FC + 2 GbE (PB-48K-18i, up to two blades per
chassis)
Small Form-Factor Pluggable (SFP) optical transceivers utilized
for 1-, 2-, and 4-Gbit/sec ports
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EMC Connectrix B Series ED-48000B Hardware Reference Manual