PM4328 View Datasheet(PDF) - PMC-Sierra
Part Name
Description
MFG CO.
'PM4328' PDF : 250 Pages View PDF
STANDARD PRODUCT
DATASHEET
PMC-2011596
ISSUE 1
PM4328 TECT3
HIGH DENSITY T1/E1 FRAMER
AND M13 MULTIPLEXER
not available in payload loopback mode. The data flow in per-channel loopback
is illustrated in Figure 37.
Figure 37: Per-Channel Loopback
CTCLK*
ED[1:28]
ECLK[1:28]/EFP[1:28]/
ESIG[1:28]
CEFP*
CECLK*
ID[1:28]
ICLK[1:28]/ISIG[1:28]
IFP[1:28]
TRANSMITTER
ESIF
Egress
Interface
TPSC
Per-DS0
Serial
Controller
ISIF
Ingress
Interface
T1-XBAS/E1-TRAN
BasicTransmitter:
Frame Generation,
Alarm Insertion,
Signaling
MUX
ITrunkti Conditioning
Line Coding
TOPS
Timing Options
TJAT
Digital Jitter
Attenuator
TxCLK[1:28]
TxD[1:28]
Per - DS0 Loopback
ELST
Elastic
Store
FRAM
Framer/
Slip Buffer
RAM
T1/E1-FRMR
Framer:
Frame
Alignment,
Alarm
Extraction
RJAT
Digital Jitter
Attenuator
RxCLK[1:28]
RxD[1:28]
RECEIVER
12.9 DS3 Loopback Modes
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,
PROPRIETARY AND CONFIDENTIAL
154
Share Link: 
