Appendix B: MDA-a and MDA-aXP Card Descriptions
7750 SR-a4 and SR-a8 Installation Guide 167
Port Allocation
The type of modules that you install affects the numbering of the allocated ports.
One dual-port-CSFP occupies one slot and two ports. If all 22 slots have dual-port CSFPs
installed, 44-ports are allocated. The card requires 22 CSFPs for full 44-port operation.
One single-port SFP occupies one slot and one port. Single-port SFPs use one odd-numbered
port when plugged into a CSPF slot. If all 22 slots have single-port SFPs installed, 22 ports
are allocated as 1, 3, 5...41, 43.
The card also supports a mixed configuration of CFSPs and SFPs. If you install a mix of
single-port and dual-port (CSFP) modules, the allocated port numbers will be
non-consecutive. For example, if the first and fourth modules are dual-port CSPFs and the
second and third modules are SFPs, the following ports are used 1, 2, 3, 5, 7, 8.
Port Line Rate
The 1GigE CSFP/SFP MDA-a card is an oversubscribed 25 Gb/s MDA-a. The card’s
connection to the IOM is only 25 Gb/s. The card supports 1 Gb/s line rate out of each port
only if 25 or fewer ports are in use.
7 Ports Sixteen 1 Gigabit Ethernet SFP ports, numbered 25 to 40
The ports are aligned in two rows as follows:
• Top row—ports 25-26, 29-30, 33-34, 37-38
• Bottom row—ports 27-28, 31-32, 35-36, 39-40
8 Ports Four 1 Gigabit Ethernet SFP ports, numbered 41 to 44
The ports are aligned in two rows as follows:
• Top row—ports 41-42
• Bottom row—ports 43-44
9 MDA-a model 44-1GB-CSFP-SFP
Table 84: 44-port 1GigE CSFP/SFP MDA-a Description (Continued)
Key Label/Part Description
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