
Multi-Service Access Device For Channelized Interfaces
Telecom Standard Product Data Sheet
Production
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990823, Issue 4
586
Calendar
Entry
STS-1
ch#
STS-3c
ch#
STS-12c
ch#
Calendar
Entry
STS-1
ch#
STS-3c
ch#
STS-12c
ch#
17
5
1
12
41
33
25
12
18
6
2
24
42
34
26
24
19
7
3
36
43
35
27
36
20
16
12
0
44
44
36
0
21
17
13
12
45
45
37
12
22
18
14
24
46
46
38
24
23
19
15
36
47
47
39
36
For instance, if an STS-3c channel occupied entries 0, 16, and 32 in the calendar, it can be broken
up into 3 STS-1 channels by simply overwriting those 3 calendar entries with new PHY channel
numbers.
If 3 STS-1 channels are to be combined into an STS-3c channel, the 3 calendar entires can simply
be written with the STS-3c channel number and the calendar will be reprovisioned with each
channel receiving the appropriate service bandwidth.
Note that when reconfiguring the calendar, the affected calendar entries must be unprovisioned in
its upstream blocks first (RXSDQ, RTDP, RCFP, RCAS blocks) to ensure that they are not being
serviced while the reconfiguration is taking place. Unprovisioning the channels will make it so
the calendar algorithm sees no data available from those channels.
14.18 Setting ATM Mode of Operation over Utopia L3 or POS-PHY L3
ATM is the default operation mode for the S/UNI-MACH48. The following sequence of
operation should be used to prepare a channel(s) for ATM operation without affecting other
channels.
1. Input pin POSL3/UL3B must be tied to logic 1 to enable mixed-ATM/POS operation or to
logic 0 for pure ATM operation with Utopia Level 3 interface. The POS-PHY L3 interface
must be used for dual-mode operation. This must be set at power-up.
2. Unprovision (disable) all line-side timeslots and system side channels which are to be
changed. This is to be done in the TCAS12, RCAS12, TCFP, RCFP, TTDP, RTDP, RXSDQ,
and TXSDQ blocks. The FIFOs of the corresponding channels will be reset and emptied
when they are unprovisioned.
3. Leave the TXSDQ and RXSDQ BT[4:0] and DT[7:0] values equal to their default values of 3
respectively. See Sections 14.15 and 14.16 for details.
4. Set the POS_SEL register bits in the TCFP, RCFP, TTDP and RTDP blocks to logic 0 for the
desired ATM channels. Optionally set the POS_SEL register bits RXSDQ and TXSDQ
blocks to 0 for the desired ATM channels if runt cell detection is required at the expense of
reduced bandwidth. The RXSDQ and TXSDQ will still process cells correctly, though
without the size checking if configured for POS traffic.