PXB4219 Datasheet, PDF (89/290 Pages) Infineon Technologies AG – IWE8 Interworking Element for 8 E1/T1 Lines

PXB4219 / PXB4220 / PXB4221
Operational Description
programmed with one Reference Slot at RAM slot 0. This slot number is used to identify
the channel (“channel_nr” = 0).
4.11.2.2 Structured CES
For AAL ports with structured CES (Nx64 kbit/s) service, the timeslots are grouped into
channels containing N of 32 timeslots. The mapping of the N x 64 kbit/s channels into an
T1/E1 frame is done by programming the 32 positions of the internal configuration RAMs
(RAM1 for receive ports, RAM2 and RAM3 for transmit ports).
It is possible to define more than one channel of N timeslots within one frame. In this
case each channel has its own reference slot, followed by N-1 continuation slots.
Additional unused frame slots that do not belong to any channel should be programmed
as “AAL Idle Slot”.
The timeslot in the group of N timeslots with the lowest frame slot number is called the
reference slot. The corresponding frame slot position in the internal RAM should be
programmed as an “AAL Reference Slot”. The slot number of the AAL Reference Slot is
used to identify the channel (“channel_nr”).
The other frame slot positions of the channel should be programmed as “AAL
Continuation Slots”. The reference slot number, as defined by the “ref_slot_nr” field
entry, is used to identify the channel the continuation slot belongs to. The N timeslots of
a channel do not need to have consecutive frame slot numbers. They can be deliberately
chosen out of the 32 frame slots.
Table 23 AAL Idle slot positions for structured CES in AAL mode
Slot number
E1
T1 in FAM
T1 in GIM
0
AAL Idle
AAL Idle
AAL Ref./Cont./Idle
1
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
2
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
3
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
4
AAL Ref./Cont./Idle AAL Idle
AAL Ref./Cont./Idle
5
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
6
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
7
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
8
AAL Ref./Cont./Idle AAL Idle
AAL Ref./Cont./Idle
9
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
10
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
11
AAL Ref./Cont./Idle AAL Ref./Cont./Idle AAL Ref./Cont./Idle
12
AAL Ref./Cont./Idle AAL Idle
AAL Ref./Cont./Idle
Data Sheet
89
2002-05-06