7750 SR-a Chassis Features
30 7750 SR-a4 and SR-a8 Installation Guide
The 7750 SR-a8 supports up to two 7750 IOM-a cards. IOM-a 1 in slot three; IOM-a 2 in slot
six. Each IOM-a performs data forwarding from the ingress port to the egress port. There is
no switch fabric for the 7750 SR-a8.
The system can operate with one IOM-a and one forwarding complex. In this configuration
impedance panels are required for the second complex IOM-a slot and MDA-a slots.
Each IOM-a can support up to four MDA-a cards:
• IOM-a 1 supports MDA-a cards in slot one at the top of the chassis and slot two. The
adapter cards are numbered individually as MDA-a 1/1, MDA-a 1/2, MDA-a 1/3, and
MDA-a 1/4.
• IOM-a 2 supports MDA-a cards in slots four and five. The adapter cards are
numbered individually as MDA-a 2/1, MDA-a 2/2, MDA-a 2/3, and MDA-a 2/4.
Each IOM-a with its MDA-a cards makes up a forwarding complex. Each complex has a
forwarding capacity of 100 Gb/s.
Slot seven, the bottom slot, supports up to two CPM-a cards, designated as CPM A and CPM
B. In a redundant system, the CPM-a cards are installed in slots CPM A and CPM B. In a
simplex system, the CPM-a can be installed in slot CPM A or CPM B; an impedance panel
must be installed in the empty CPM-a slot.
Power Supply Units are located below slot 7 at the bottom of the 7750 SR-a8 chassis. The
PSUs are installed in an N+1 configuration, and numbered PSU 1 to PSU 4 from left to right.
PSUs are orderable items that are available for AC or DC power feeds.
Chassis bundles for the 7750 SR-a8 include two PSUs. PSUs are orderable items that are
available for AC and/or DC power feeds. Alcatel-Lucent recommends that the PSUs be
installed in an N+1 configuration. A PSU impedance panel must be installed in any empty
PSU slot.
When mounted horizontally, the right side of the 7750 SR-a8 chassis has one vertical slot for
an air filter. The left side of the chassis has one vertical slot for the 7750 SR-a8 fan tray, which
pulls air through the chassis from right to left.
Note:
• 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 100 a 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.
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