FRU
Field Replaceable Unit
Gbps
gigabits per second
Gigabit Switch Router
The Cisco 12000 Gigabit Switch Router is Cisco’s high−performance, carrier−class routing platform for tier 1
Internet Service Providers (ISPs).
GRP
Gigabit Route Processor
GSR
Gigabit Switch Router
HSSI
High−Speed Serial Interface. Network standard for high−speed (up to 52 Mbps) serial connections over WAN
links.
Hz
Abbreviation for Hertz, a measure of frequency, usually cyles per second
ID−EEPROM
electrically erasable programmable read−only memory. a special type of PROM that can be erased by
exposing it to an electrical charge.
IEC
International Electrotechnical Commission
Industry−Standard Architecture (ISA)
Industry−Standard Architecture. 16−bit bus used for Intel−based personal computers.
IOS
Cisco Internetwork Operating System. Cisco system software that provides common functionality, scalability,
and security for all products under the CiscoFusion architecture. Cisco IOS allows centralized, integrated, and
automated installation and management of internetworks, while ensuring support for a wide variety of
protocols, media, services, and platforms.
ISDN
20614 Cisco Installing and Maintaining Routers Part 4: 12000 GSR Series and XS5032 Modules
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