Overview of the 7705 SAR-M Variants
54 7705 SAR-M Chassis Installation Guide
Overview of the 7705 SAR-M Variants
There are four variants of the 7705 SAR-M chassis:
• 7 Ethernet ports, 16 T1/E1 ports, 1 module slot, actively cooled
• 7 Ethernet ports, 0 T1/E1 ports, 1 module slot, actively cooled
• 7 Ethernet ports, 16 T1/E1 ports, 0 module slots, passively cooled
• 7 Ethernet ports, 0 T1/E1 ports, 0 module slots, passively cooled
The term 7705 SAR-M is used in this document as a generic collective reference to all
variants of the chassis. Where hardware differences occur, the chassis variant is specified.
All variants of the 7705 SAR-M run the same operating system software. The difference
between the platforms is their hardware configuration.
The 7705 SAR-M has preassigned parameters. The software and hardware architecture is
similar to other SAR products in that the IOM is a virtual entity, existing in software and
supported by the system hardware. The I/O ports are grouped and virtualized into slots
(MDAs) for convenience of assignment. The result of this design is that the CLI identifiers
for the IOM and MDAs have been preset (see below). Also, except for the optional module,
the system hardware is permanently built into the chassis. This preset arrangement of system
parameters is considered to be a “fixed” configuration. The fixed configuration of the
7705 SAR-M restricts the router to “port” level provisioning; however, the IOM and MDA
numbering must still be specified within CLI commands.
The CSM is a physical component in the 7705 SAR-8 and 7705 SAR-18 chassis, which must
be installed in the chassis but does not need to be provisioned. The fixed configuration of the
7705 SAR-M replaces the module with a control and switching functional block that is
integrated into the chassis and does not need to be provisioned. It appears on the CLI as CSM
A. The control and switching functions include the console and management interfaces, the
alarm and fan functions (on applicable variants), the synchronization interfaces, and system
LEDs.
The CLI syntax follows the structure of IOM number/MDA number/port number. The IOM
and MDA do not need to be physically provisioned. When specifying a port, the IOM is
always 1 and the MDA must be specified as:
• 1 for Ethernet ports (all variants)
• 2 for T1/E1 ports (only on chassis equipped with T1/E1 ports)
• 3 for module position (only on chassis equipped with module slots)
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