![](http://datasheet.mmic.net.cn/330000/PM8315_datasheet_16444435/PM8315_229.png)
STANDARD PRODUCT
PM8315 TEMUX
DATASHEET
PMC-1981125
ISSUE 7
HIGH DENSITY T1/E1 FRAMER WITH
INTEGRATED VT/TU MAPPER AND M13 MUX
PROPRIETARY AND CONFIDENTIAL
214
1,28
2,28
3,28
34,62,90
100,184,268
101,185,269
102,186,270
34,62,90
34,62,90
Table 21
- E1/TVT2 Tributary Column Numbering
E1#
SPE1 Column
SPE2 Column
SPE3 Column
SBI Column
1,1
2,1
3,1
1,2
2,2
1,21
2,21
3,21
7,28,49,70
19,82,145,208
20,83,146,209
21,84,147,210
22,85,148,211
23,86,149,212
7,28,49,70
7,28,49,70
8,29,50,71
8,29,50,71
27,48,69,90
79,142,205,268
80,143,206,269
81,144,207,270
27,48,69,90
27,48,69,90
SBI Timing Master Modes
The TEMUX supports both synchronous and asynchronous SBI timing modes.
Synchronous modes apply only to T1 and E1 tributaries and are used with
ingress elastic stores to rate adapt the receive tributaries to the fixed SBI data
rate. Asynchronous modes allow T1, E1, DS3 and transparent tributaries to float
within the SBI structure to accommodate differences in timing. Note that
Synchronous mode SBI timing operation is required for support of Channel
Associated Signaling (CAS).
In synchronous SBI mode the T1 DS0s and E1 timeslots are in a fixed format
and do not move relative to the SBI structure. The SBI frame pulse, SC1FP, in
synchronous mode can be enabled to indicate CAS signaling multi-frame
alignment by pulsing once every 12
th
2KHz SC1FP frame pulse period.
SREFCLK sets the ingress rate from the receive elastic store.
In Asynchronous modes timing is communicated across the Scaleable
Bandwidth Interconnect by floating data structures within the SBI. Payload
indicator signals in the SBI control the position of the floating data structure and
therefore the timing. When sources are running faster than the SBI the floating
payload structure is advanced by an octet be passing an extra octet in the V3
octet locations (H3 octet for DS3 mappings). When the source is slower than the
SBI bus, the floating payload is retarded by leaving the octet after the V3 or H3