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ADD/DROP
DS1DIGITAL SIGNAL 1 (=T1), 24 DS0 CHANNELS
DS3DIGITAL SIGNAL LEVEL 3 T-CARRIER (ALSO CALLED T3) = 28 DS1 CHANNELS
STS-1SYNCHRONOUS TRANSPORT SIGNAL LEVEL-1 = 1 DS3 CHANNEL
TRMTRANSCODER RESOURCE MODULE
TSITIME SLOT INTERCHANGER