PM4328-PI PMC-Sierra, Inc., PM4328-PI Datasheet - Page 167
PM4328-PI
Manufacturer Part Number
PM4328-PI
Description
Framer, T1|E1|T3 Standard Format, 324-BGA
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM4328-PI.pdf
(250 pages)
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STANDARD PRODUCT
DATASHEET
PMC-2011596
12.9 DS3 Loopback Modes
PROPRIETARY AND CONFIDENTIAL
ECLK[1:28]/EFP[1:28]/
ICLK[1:28]/ISIG[1:28]
not available in payload loopback mode. The data flow in per-channel loopback
is illustrated in Figure 37.
Figure 37: Per-Channel Loopback
The TECT3 provides three DS3 M13 multiplexer loopback modes to aid in
network and system diagnostics at the DS3 interface. The DS3 loopbacks can be
initiated via the µP interface whenever the DS3 framer/M13 multiplexer is
enabled. The DS3 Master Data Source register controls the DS3 loopback
modes.
DS3 Diagnostic Loopback
DS3 Diagnostic Loopback allows the transmitted DS3 stream to be looped back
into the receive DS3 path, overriding the DS3 stream received on the
RDAT/RPOS and RNEG/RLCV inputs. The RCLK signal is also substituted with
the transmit DS3 clock, TCLK. While this mode is active, AIS may be substituted
for the DS3 payload being transmitted on the TPOS/TDAT and TNEG/TMFP
outputs. The configuration of the receive interface determines how the
TNEG/TMFP signal is handled during loopback: if the UNI bit in the DS3 FRMR
register is set, then the receive interface is configured for RDAT and RLCV,
ESIG[1:28]
IFP[1:28]
ED[1:28]
CECLK*
CTCLK*
ID[1:28]
CEFP*
Controller
Per-DS0
Interface
Interface
Egress
TPSC
Serial
Ingress
ESIF
ISIF
ISSUE 1
MUX
Elastic
ELST
Store
T1-XBAS/E1-TRAN
Per - DS0 Loopback
Frame Generation,
Signaling
Trunk Conditioning
I
BasicTransmitter:
Alarm Insertion,
Line Coding
154
ti
T1/E1-FRMR
Slip Buffer
Alignment,
Extraction
Framer/
FRAM
Framer:
Frame
RAM
Alarm
Timing Options
Digital Jitter
Attenuator
TOPS
TJAT
Digital Jitter
Attenuator
RJAT
HIGH DENSITY T1/E1 FRAMER
TRANSMITTER
AND M13 MULTIPLEXER
RECEIVER
PM4328 TECT3
TxCLK[1:28]
TxD[1:28]
RxCLK[1:28]
RxD[1:28]
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