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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
106
Expected PSL
Accepted PSL
PSLM State
UNEQ State
(Unequipped)
PDI Code
001
Match
Inactive
PDI Code
PDI Code
Match
Inactive
PDI Code
XXX
≠
000, 001, PDI Code
000
Mismatch
Inactive
XXX
≠
000, 001,
PDI Code
Mismatch
Active
(unequipped)
XXX
≠
000, 001,
PDI Code
001
Match
Inactive
XXX
≠
000, 001,
PDI Code
XXX
Match
Inactive
XXX
≠
000, 001,
PDI Code
YYY
Mismatch
Inactive
Each time an incoming PSL differs from the one in the previous multiframe, the
PSL unstable counter is incremented. Thus, a single bit error in the PSL in a
sequence of constant PSL values will cause the counter to increment twice, once
on the errored PSL and again on the first error-free PSL. The incoming PSL is
considered unstable when the counter reaches five. The counter is cleared
when the same PSL is received for five consecutive multiframes.
9.30 Receive Tributary Demapper (RTDM)
The Receive Tributary Demapper (RTDM) demaps up to 28 T1 or 21 E1 bit
asynchronous mapped signals from an STS-1 SPE, TUG3 within a STM-1/VC4
or STM-1 VC3 payload. The bit asynchronous T1 mapping consists of 104 octets
every 500 μs (2 KHz) and is shown in Table 3. The bit asynchronous E1 mapping
consists of 140 octets every 500us and is shown in Table 4.
Table 3
- Asynchronous T1 Tributary mapping
V5
RRRRRRIR
24 bytes - 8I
J2
C
1
C
2
OOOOIR
24 bytes - 8I