PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
Figure 10 – Compliance with ITU-T Specification G.823 for E1 Input Jitter
DPLL TOLERANCE
WITH AMI ENCODED
10
215 -1 PRBS
SINEWAVE
JITTER
DPLL TOLERANCE
AMPLITUDE
WITH HDB3 ENCODED
P. TO P. (UI)
IN SPEC
REGION
215-1 PRBS
LOG SCALE
1.5
1
REC. G823
JITTER
TOLERANCE
SPECIFICATION
0.2
0.1
1.8
2.4
5
3
4
10
10
10
SINEWAVE JITTER FREQUENCY, Hz - LOG SCALE
9.4
9.5
Receive Jitter Attenuator (RJAT)
The Receive Jitter Attenuator (RJAT) digital PLL attenuates the jitter present on the
RXTIP/RXRING inputs. The attenuation is only performed when the RJATBYP register bit is a
logic 0.
The jitter characteristics of the Receive Jitter Attenuator (RJAT) are the same as the Transmit
Jitter Attenuator (TJAT).
T1 Inband Loopback Code Detector (IBCD)
The T1 Inband Loopback Code Detection function is provided by the IBCD block. This block
detects the presence of either of two programmable INBAND LOOPBACK ACTIVATE and
DEACTIVATE code sequences in the receive data stream. Each INBAND LOOPBACK code
sequence is defined as the repetition of the programmed code in the PCM stream for at least 5.1
seconds. The code sequence detection and timing is compatible with the specifications defined
in T1.403-1993, TA-TSY-000312, and TR-TSY-000303. LOOPBACK ACTIVATE and
DEACTIVATE code indication is provided through internal register bits. An interrupt is generated
to indicate when either code status has changed.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
38
PMC [ PMC-SIERRA, INC ]
