Alcatel-Lucent 7705 - Figure 23: Cesopsn Packet Payload Format for Trunk-Specific N X 64 Kb;S

VLL Services
7705 SAR OS Services Guide Page 147
Figure 23 shows the format of the CESoPSN TDM payload (with and without CAS) for
packets carrying trunk-specific n × 64 kb/s service.
For CESoPSN without CAS, select the packet size so that an integer number of frames are
transported. That is, if n timeslots per frame are to be encapsulated in a TDM PW, then the
packet size must be a multiple of n (where n is not equal to 1). For example, if n = 4
timeslots, then the packet size can be 8, 12, 16 and so on.
For CESoPSN with CAS, the packet size is an integer number of frames, where the number
of frames is 24 for T1 or 16 for E1, and is not user-configurable. The extra bytes for ABCD
(CAS) signaling bits are not included when setting the packet size.
Figure 23: CESoPSN Packet Payload Format for Trunk-Specific n x 64 kb/s
(with and without CAS transport)
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
---------- +-+-+-+-+-+-+-+-+ ---------- +-+-+-+-+-+-+-+-+
| Timeslot 1 | | Timeslot 1 |
+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
| Timeslot 2 | | Timeslot 2 |
Frame #1 | ... | Frame #1 | ... |
| Timeslot n | | Timeslot n |
---------- +-+-+-+-+-+-+-+-+ ---------- +-+-+-+-+-+-+-+-+
---------- +-+-+-+-+-+-+-+-+ ---------- +-+-+-+-+-+-+-+-+
| Timeslot 1 | | Timeslot 1 |
+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
| Timeslot 2 | | Timeslot 2 |
Frame #2 | ... | Frame #2 | ... |
| Timeslot n | | Timeslot n |
---------- +-+-+-+-+-+-+-+-+ ---------- +-+-+-+-+-+-+-+-+
... | ... | ... | ... |
---------- +-+-+-+-+-+-+-+-+ ---------- +-+-+-+-+-+-+-+-+
| Timeslot 1 | | Timeslot 1 |
+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
| Timeslot 2 | | Timeslot 2 |
Frame #m | ... | Frame #m | ... |
| Timeslot n | | Timeslot n |
---------- +-+-+-+-+-+-+-+-+ ---------- +-+-+-+-+-+-+-+-+
Nibbles 1,2 |A B C D|A B C D|
---------- +-+-+-+-+-+-+-+-+
Nibbles 3,4 |A B C D|A B C D|
---------- +-+-+-+-+-+-+-+-+
Nibble n |A B C D| (pad) |
(odd) & pad +-+-+-+-+-+-+-+-+
(a) Packet with CAS (b) Packet without CAS
Note: The extra bytes for CAS signaling bits must be included when setting the service-
mtu size. See
Structured T1/E1 CES with CAS on page 152 for more information.