![](http://datasheet.mmic.net.cn/330000/PM8315_datasheet_16444435/PM8315_237.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
222
E1 Tributary Mapping
Table 28 shows the format for mapping 63 E1s within the SPE octets. The
timeslots and framing bits within each E1 are easily located within this mapping
for channelized E1 applications. It is acceptable for the framing bits to not carry
valid framing information on the Add Bus since the physical layer device will
provide this information. Unframed E1s use the exact same format for mapping
63 E1s into the SBI except that the E1 tributaries need not align with the timeslot
locations associated with channelized E1 applications. The V1,V2 and V4 octets
are not used to carry E1 data and are either reserved used for control
information across the interface. When enabled, the V4 octet carries clock
phase information across the SBI. The V1 and V2 octets are unused and should
be ignored by devices listening to the SBI bus. The V5 and R octets do not carry
any information and are fixed to a zero value. The V3 octet carries an E1 data
octet but only during rate adjustments as indicated by the V5 indicator signals,
SDV5 and SAV5, and payload signals, SDPL and SAPL. The PP octets carry
channel associated signaling phase information and E1 frame alignment. TS#0
through TS#31 make up the E1 channel.
The V1,V2,V3 and V4 octets are fixed to the locations shown. All the other
octets, shown shaded for E1#1,1, float within the allocated columns maintaining
the same order and moving a maximum of one octet per 2KHz multi-frame. The
position of the floating E1 is identified via the V5 Indicator signals, SDV5 and
SAV5, which locate the V5 octet. When the E1 tributary rate is faster than the E1
tributary nominal rate, the E1 tributary is shifted ahead by one octet which is
compensated by sending an extra octet in the V3 location. When the E1
tributary rate is slower than the nominal rate the E1 tributary is shifted by one
octet which is compensated by inserting a stuff octet in the octet immediately
following the V3 octet and delaying the octet that was originally in that position.
Table 28
- E1 Framing Format
COL #
E1#1,1
#2,1-3,21
E1#1,1
#2,1-3,21
E1#1,1
#2,1-3,21
E1#1,1
#2,1-3,21
ROW #
1-18
19
20-81
82
83-144
145
146-207
208
209-270
1
Unused
V1
V1
V5
-
PP
-
TS#0
-
2
Unused
TS#1
-
TS#2
-
TS#3
-
TS#4
-
3
Unused
TS#5
-
TS#6
-
TS#7
-
TS#8
-
4
Unused
TS#9
-
TS#10
-
TS#11
-
TS#12
-
5
Unused
TS#13
-
TS#14
-
TS#15
-
TS#16
-
6
Unused
TS#17
-
TS#18
-
TS#19
-
TS#20
-
7
Unused
TS#21
-
TS#22
-
TS#23
-
TS#24
-
8
Unused
TS#25
-
TS#26
-
TS#27
-
TS#28
-
9
Unused
TS#29
-
TS#30
-
TS#31
-
R
-