7750 SR-a Modules
36 7750 SR-a4 and SR-a8 Installation Guide
Figure 7 shows the 7750 SR-a IOM-a, which is used in the 7750 SR-a4 and 7750 SR-a8. See
IOM-a LEDs on page 146 for a description of the LED.
Figure 7: 7750 SR-a IOM-a
MDA-a Cards
The 7750 SR-a MDA-a cards provide a wide variety of interfaces that support a full range of
carrier Ethernet features.
The supported MDA-a locations are:
• 7750 SR-a4 supports MDA-a cards in slot one (at the top of the chassis) and slot two.
The MDA-a slots are numbered individually as MDA-a 1/1, MDA-a 1/2, MDA-a 1/
3, and MDA-a 1/4. See Figure 2 for MDA-a slot locations on the 7750 SR-a4.
• 7750 SR-a8 supports MDA-a cards in slot one (at the top of the chassis) and slot two.
Those MDA-a slots are numbered individually as MDA-a 1/1, MDA-a 1/2, MDA-a
1/3, and MDA-a 1/4.
The 7750 SR-a8 also supports MDA-a cards that are installed in slots four and five.
Those MDA-a slots are numbered individually as MDA-a 2/1, MDA-a 2/2, MDA-a
2/3, and MDA-a 2/4. See Figure 4 for MDA-a slot locations on the 7750 SR-a8.
• MDA-a cards operate only when their host IOM-a is installed.
• MDA-a and MDA-aXP cards can be installed in any MDA slot with the following
limitation:
→ A 100 Gb/s MDA-aXP card can operate in a 25 Gb/s slots, but the slot will be
oversubscribed. If you install a 100 Gb/s MDA-aXP card in a 25 Gb/s slot, the
maximum line rate is 25 Gb/s.
→ A 25 Gb/s MDA-a card can operate in a 100 Gb/s slot, but the slot will be
undersubscribed. If you install a 25 Gb/s MDA-a card in a 100 Gb/s slot, the
maximum line rate is 25 Gb/s.
MDA-a cards can be installed in the chassis in any combination that does not exceed the
maximum number. The adapter cards are hot-swappable and field-replaceable by qualified
personnel as described in the procedures in Appendix C: Field-Replaceable Units.
The following 25-Gb/s MDA-a cards are supported on the 7750 SR-a4 and 7750 SR-a8:
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