PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
The default line build out is a 50% duty cycle square pulse compatible with the
ITU-T G.703 specification for a 120 Ω symmetrical line. A separate build out is
available for 75 Ω coaxial line.
A small, high-frequency negative-going spike may be observed on the falling
edge of the transmit pulse.This spike can be filtered out by using the optional
"snubbing" network shown in Figure 11.
The XPLS includes a driver performance monitor to detect nonfunctional links.
Two monitor inputs, PM_TIP and PM_RING, are internally bonded to the XPLS's
own TAP and TAN outputs. If no pulses are detected alternately across the
PM_TIP or PM_RING monitor points for 62 consecutive TCLKO periods, the
monitored link is declared failed. The XPLS can be programmed to produce an
interrupt whenever the link monitor state changes.
The XPLS block provides Alarm Indication Signalling (AIS) generation capability
by generating alternating mark signals on the link when the TAIS bit is
programmed high.This is useful when the internal loopback modes are used.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
60
PMC [ PMC-SIERRA, INC ]
