T1 (Terrestrial 1)

Host

Digital Circuit

1

2

DS-1

Buffer

Buffer

24 …

24

2 1 …

24

2 1 …

24

2 1 …

TDM

TDM

…

1 2 24 …

1 2 24 …

1 2 24

1 2

…

24

Frame

Framing Bit

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

1 0 0 1 1 0 0 1

Byte

• optical transport network (OTN)
• optical transport unit (OTU)
• optics
• OPX (Off-Premises eXtension)
• OQPSK (Offset Quadrature Phase Shift Keying)
• orange hose
• orderwire
• .org (organization)
• original band (O-Band)
• original equipment manufacturer (OEM)
• or ITU-TSS)
• orthogonal
• orthogonal frequency division multiplexing (OFDM)
• oscillate
• oscillate
• oscillator
• oscillator
• OSI Reference Model (Open Systems Interconnection Model)
• OS (Operating System)
• OSPF (Open Shortest Path First)
• OSP (OutSide Plant)
• OSS (Operations Support System)
• Ostrofsky, Marc
• OTA (over the air)
• Other Common Carrier (OCC)