PM4314 QDSX
DATA SHEET
PMC-950857
ISSUE 5
QUAD T1/E1 LINE INTERFACE DEVICE
Figure 15
- E1 JitterTransfer
0
-10
-20
G.737, G738,
G.739, G.742
m ax
U nacc eptable
Region
DJAT
response
-19 .5
Jitter Gain
(dB)
-30
-40
-50
1
100
1k
10k
40
10
8.8
Jitter Frequency, Hz
9.11 Analog Pulse Generator (XPLS)
The Analog Pulse Generator function is provided by the Transmit Pulse
Generator (XPLS) block that converts Non-Return-to-Zero (NRZ) pulses into line
signals suitable for use in a G.703 1544 kbit/s and 2048 kbit/s intra-office
environment. A logical "1" on the positive NRZ input to XPLS causes a positive
pulse to be transmitted; a similar signal on the negative NRZ input to XPLS
causes a negative pulse to be transmitted. If both positive and negative NRZ
inputs to XPLS are logical "0" or "1," no output pulse is transmitted.
The output pulse shape is synthesized digitally from user-programmed template
settings with an internal Digital to Analog (D/A) converter.The converter is
updated eight times per period with these programmed words. These words
define the output pulse shape. Recommended codes for DSX-1 and CEPT E1
120 Ω symmetrical lines and 75 Ω coaxial lines are given in the Operations
section. If an external circuit different from that recommended in the following
diagram is used, the pulse generator permits creation of custom pulse shapes.
Refer to the Operations section for details.
AMI signaling is created by exciting either the internal TIP or RING DRIVERS
that drive a line-coupling transformer differentially via the TXTIP[4:1] and
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
47
PMC [ PMC-SIERRA, INC ]
