Rainbow Electronics DS2181A User Manual
Page 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
0
TMSYNC
FRAME #
TFSYNC
TAF
1
TAF
2
TMO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
15
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).