7750 SR-a4 and 7750 SR-a8 Overview
7750 SR-a4 and SR-a8 Installation Guide 35
IOM-a
The IOM-a performs ingress and egress packet processing and queuing. All forwarding,
service management, and traffic management functions are performed by the IOM-a.
One IOM-a is required by the 7750 SR-a4 in slot 3. Two IOM-a cards are supported by the
7750 SR-a8: one in slot 3 and one in slot 6. At least one IOM-a is required in the 7750 SR-a8.
The 7750 SR-a IOM-a is intended only for the 7750 SR-a chassis and is not interchangeable
with other 7750 SR products.
Each IOM-a provides 100 Gb/s connectivity to MDA-a cards. Up to four MDA-a cards are
supported by one IOM-a.
The IOM-a cards are optimized for deployment in a variety of Ethernet and IP-based
applications. Table 6 describes the IOM-a variants.
2 CF card Internal
memory
The primary copy of the 7750 SR-a TiMOS software is shipped with the
OS software license on a CF memory card. The card, which contains the
boot software, must be inserted in the internal CF slot on the CPM-a before
the CPM-a is installed in the chassis. The CF memory card can also be used
to copy and store system boot software, OS software, and configuration
files and logs.
Refer to the 7750 SR-a Release Notes for detailed information about the CF
storage devices supported on the 7750 SR-a routers.
Table 5: 7750 SR-a CPM-a Internal CF Drive Features (Continued)
Key Label/Part Sub-
category
Description
Table 6: IOM-a Variants
IOM-a Variant Description Part Number
IOM - 7750 SR-a - L2HQ 7750 SR-a 100Gb/s Input Output Module. This IOM-a
includes a license for the Layer 2 with high queuing (L2HQ)
features set.
3HE09202CA
IOM - 7750 SR-a - L3BQ 7750 SR-a 100Gb/s Input Output Module. This IOM-a
includes a license for the Layer 3 with basic queuing (L3BQ)
features set.
3HE09202BA
IOM - 7750 SR-a - L3HQ 7750 SR-a 100Gb/s Input Output Module. This IOM-a
includes a license for the Layer 3 with high queuing (L3HQ)
features set.
3HE09202AA
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