Rainbow Electronics DS2180A - Manual (Page 11)

DS2180A
041995 11/36
193S TRANSMIT MULTIFRAME TIMING Figure 9
TLCLK
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 12
ЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙ
Й
Й
B A B A
FRAME #
TFSYNC
TMSYNC 1
TMO 1
TSIGSEL
TABCD 2
TLINK 3
TSIGFR
NOTES:
1. Transmit frame and multiframe timing may be established in one of four ways:
a. With TFSYNC tied low, TMSYNC may be pulsed high once every multiframe period to establish multiframe
boundaries, allowing internal counters to determine frame timing.
b. TFSYNC may be pulsed every 125 microseconds; pulsing TMSYNC once establishes multiframe bound-
aries.
c. TMSYNC and TFSYNC may be continuously pulsed to establish and reinforce frame and superframe tim-
ing.
d. If TMSYNC is tied low and TFSYNC is pulsed at frame boundaries, the transmitter will establish an arbi-
trary multiframe boundary as indicated by TMO.
2. Channels in which robbed bit signaling is enabled will sample TABCD during the LSB bit time in frames indi-
cated.
3. When external S-bit insertion is enabled, TLINK will be sampled during the F-bit time of even frames and in-
serted into the outgoing data stream.