STANDARD PRODUCT
PM4328 TECT3
DATASHEET
PMC-2011596
ISSUE 1
HIGH DENSITY T1/E1 FRAMER
AND M13 MULTIPLEXER
Figure 21: Clock Master: Full T1/E1
RECEIVER
FRAM
ID[1:28]
Framer:
ISIF
Slip Buffer RAM
IFP[1:28]
Ingress
System
Interface
RJAT
Receive Data[1:28]
Receive CLK[1:28]
FRMR
ID[x], IFP[x]
Timed to
ICLK[1:28]
Digital Jitter
Attenuator
Framer:
Frame Alignment,
Alarm Extraction
ICLK[1:28]
In Clock Master: Full T1/E1 mode, the elastic store is bypassed and the ingress
clock (ICLK[x]) is a jitter attenuated version of the 1.544 MHz or 2.048 MHz
receive clock coming from the M13 multiplex. Jitter attenuation is selectable by
the RJATBYP bit in the T1/E1 Receive Options register. ICLK[x] is pulsed for
each bit in the 193 bit T1 or 256 bit E1 frame. The ingress data appears on ID[x]
and the ingress frame alignment is indicated by IFP[x]. In this mode,
demultiplexed T1 or E1 data passes through the TECT3 unchanged during out-
of-frame conditions, similar to an offline framer system. When the TECT3 is the
clock master in the ingress direction, the elastic store is used to buffer between
the ingress and egress clocks to facilitate per-Channel loopback.
Figure 22: Clock Master: NxChannel
RECEIVER
FRAM
Framer:
ID[1:28]
IFP[1:28]
ISIF
Slip Buffer RAM
Ingress
System
Interface
RJAT
Receive Data[1:28]
Receive CLK[1:28]
FRMR
ICLK[1:28]
Digital Jitter
Attenuator
Framer:
Frame Alignment,
Alarm Extraction
ID[x], IFP[x]
Timed to
gapped
ICLK[1:28]
In Clock Master: NxChannel mode, ICLK[x] is a gapped version of the jitter
attenuated 1.544 MHz or 2.048 MHz receive clock coming from the M13
multiplex. ICLK[x] is gapped on a per channel basis so that a subset of the 24
channels in the T1 frame or 32 channels in an E1 frame is extracted on ID[x].
IFP[x] indicates frame alignment but has no clock since it is gapped during the
framing bits. Channel extraction is controlled by the RPSC block. The framing bit
position is always gapped, so the number of ICLK[x] pulses is controllable from 0
to 192 pulses per T1 frame or 0 to 256 pulses per E1 frame on a per-channel
basis. In this mode, demultiplexed or demapped T1 or E1 streams pass through
PROPRIETARY AND CONFIDENTIAL
92
PMC [ PMC-SIERRA, INC ]
