Rainbow-electronics DS2181A Manual do Utilizador descarregar pdf (Página 15)

DS2181A

041995 15/32

TRANSMIT TIMING

A low-high transition at TMSYNC once per multiframe

(every 2 milliseconds) or at a multiple of the multiframe

rate establishes outgoing CAS and/or CRC4 multiframe

alignment. Output TMO indicates that alignment. A low-

high transition at TFSYNC at the frame rate (125 us) or

at a multiple of the frame rate establishes the outgoing

frame position. Output TAF indicates that alignment.

TMSYNC and/or TFSYNC can be tied low by the user, in

which case the arbitrary frame and multiframe align-

ment established by the device will be indicated at TMO

and TAF.

Output TAF also indicates frames containing the frame

alignment signal. Those frames can be even or odd

numbering frames of the outgoing CAS multiframe

(CCR.6).

TRANSMIT MULTIFRAME TIMING Figure 12

TMSYNC

FRAME #

TFSYNC

TAF

TMO

123456789101112131415015

NOTES:

1. Alignment frames are even frames of the CAS and/or CRC4 multiframes (CCR.6 = 0).

2. Alignment frames are odd frames of the CAS multiframe (CCR.6 = 1).

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Rainbow-electronics DS2181A Manual do Utilizador Página 15