User guide

DS2181A
041995 13/32
CAS OUTPUT FORMAT IN TIMESLOT 16 Figure 8
Frame 0
1
Frame 1 Frame 15
0000XYXX
ABCD for
timeslot 1
ABCD for
timeslot 17
ABCD for
timeslot 15
ABCD for
timeslot 31
- - -
NOTE:
1. Timeslot 16 of frame 0 is reserved for the multiframe alignment word (0000), distant multiframe alarm (Y) and
extra bits (X-XX).
TINR: TRANSMIT INTERNATIONAL AND NATIONAL REGISTER Figure 9
(MSB) (LSB)
INB
– TRA NB4 NB5 NB6 NB7 NB8
SYMBOL POSITION NAME AND DESCRIPTION
INB TINR.7 International Bit. Inserted into the outgoing data stream when TCR.4 = 1.
– TINR.6 Reserved; must be 0 for proper operation.
TRA TINR.5 Transmit Remote Alarm
0 = Normal operation; bit 3 of timeslot 0 in non-alignment frame clear.
1 = Alarm condition; bit 3 of timeslot 0 in non-align frames set.
NB4 TINR.4 Transmit National Bits. Inserted into the outgoing data stream at TPOS
and TNEG when TCR.3 = 1.
NB5 TINR.3
NB6 TINR.2
NB7 TINR.1
NB8 TINR.0
TRANSMIT INTERNATIONAL AND
NATIONAL DATA
Bit 1 of timeslot 0 in all frames is known as the interna-
tional bit. When TCR.4 = 1, the transmitted international
bit is sourced from TINR.7. When TCR.4 = 0, the trans-
mitted international bit is sampled at TIND during the
first bit period of each frame. The international bit posi-
tions in all outgoing frames except 13 and 15 are re-
placed by CRC4 codewords and the CRC4 multiframe
alignment signal when CCR.3 = 1.
Bits 4 through 8 of timeslot 0 in non-align frames are re-
served for national use. When TCR.3 = 1, the trans-
mitted national bits are sourced from register locations
TINR.4 through TINR.0. If TCR.3 = 0, the national bits
are sampled at TIND during bit times 4 through 8 of
timeslot 0 in non-align frames.
Reserved bit positions in the TINR must be set to 0 when
written; those bits can be 0 or 1 when read.