cx28500 Mindspeed Technologies, cx28500 Datasheet - Page 222

• Manufacturer Part Number: cx28500
• Description: Cx28500 Multichannel Synchronous Communications Controller
• Manufacturer: Mindspeed Technologies

28500-DSH-002-C
TSBUS
TSBUS Frame
Unchannelized
VC
VSP
VT
VTG
Word
Time Slot (TS) Bus. The time slot bus is a time division multiplexed serial (one bit wide)
connection for passing digital communication signals (data paths) between TBUS Device
(broadband access multiplexer) and CX28500 (HDLC Controller).
A TSBUS contains 84 time slots.
Refers to a serial port configuration whereby the bit stream is considered a continuous stream
delimited only by occasional overhead bits. No frame synchronization is required, only
overhead bit identification. This port can be utilized only as a single logical channel.
Virtual Container. This is the SDH equivalent term to SPE. However, it applies to all digital
signal levels. It contains payload bytes plus path overhead bytes. The VC contains one C-11
signal (which has 27 bytes and carries a DS1 signal or a non-DS1 signal) plus path overhead
or one C-12 signal (which has 36 bytes and carries and E1 signal or a non-E1 signal) plus path
overhead.
Virtual serial port. A VSP is the multiple number of time slots that carry one data path in the
transmit or in the receive TSBUS Frames.
Virtual Tributary. A virtual tributary contains payload bytes plus pointer bytes in SONET
systems. The two virtual tributaries referred to in this specification are: VT1.5 which has 27
bytes and carries a DS1 signal or a non-DS1 signal; VT2.0 which has 36 bytes and carries an
E1 signal or a non-E1 signal.
Virtual Tributary Group. A virtual tributary group consists of 108 bytes. One VTG carries 4 time
multiplexed VT1.5’s signals or it carries 3 time multiplexed VT2.0 signals. One VTG does not
carry both signals.
A word is a unit of data in general. Usually it refers to 16-bits, but many times it is used more
loosely to mean a single unit of data.
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