20614 Cisco Installing and Maintaining Routers Part 4: 12000 GSR Series and XS5032 Modules
OC
optical carrier
Ohm
Ohm's Law is the mathematical relationship among electric current, resistance, and voltage.
OSI
Open Systems Interconnection
Packet over SONET (POS)
Packet over Synchronous Optical Network. See SONET.
PCMCIA
Personal Computer Memory Card International Association
Personal Compurt Memory Card International Association (PCMCIA)
Initially it was a standard for laptop cards, now it is used to store flash on cisco routers.
PFC
power factor connector
Point To Point Protocol (PPP)
Point−to−Point Protocol. Successor to SLIP that provides router−to−router and host−to−network connections over synchronous and asynchronous circuits. Whereas SLIP was designed to work with IP, PPP was designed to work with several network layer protocols, such as IP, IPX, and ARA. PPP also has built−in security mechanisms, such as CHAP and PAP. PPP relies on two protocols: LCP and NCP. See also CHAP, LCP, NCP, PAP, and SLIP.
POS
Packet−over−SONET
Power−On Self −Test (POST)
power−on self test. Set of hardware diagnostics that runs on a hardware device when that device is powered up.
PRI
Primary Rate Interface.
RISC
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