Which uplink/ downlink spectrum is allocated to following? a.) GSM – 900 b.) DCS – 1800

Which uplink/ downlink spectrum is allocated to following? a.) GSM – 900 b.) DCS – 1800

a.) GSM – 900: Uplink spectrum is 890.2–914.8 and downlink spectrum is 935.2–959.8

b.) DCS – 1800: Uplink spectrum is 1710.2–1784.8, and downlink spectrum is 1805.2–1879.8

Name the algorithms used in following: a.) Ciphering b.) Authentication

a.) Ciphering
The algorithm 129-EEA3 and 128-EIA3, 3GPP Confidentiality and Integrity Algorithm is used for ciphering in GSM

b.) Authentication
The algorithm by name A3 is used for authentication in the GSM systems
This algorithm is used in implementing Subscriber Identity Module .