
XRT84L38
380
OCTAL T1/E1/J1 FRAMER
REV. 1.0.1
(REDRAW) Figure : Timing diagram of the RxOH_n Output pin
The Receive Signaling Output Enable bit of the Receive Signaling Control Register (RSCR) determines
whether the extracted signaling bits will be sent through the Receive Overhead Output pin (RxOH_n) to
external equipments. The table below shows configurations of the Receive Overhead Output Enable bit of the
Receive Signaling Control Register.
RECEIVE SIGNALING CONTROL REGISTER (RSCR) (INDIRECT ADDRESS = 0XN2H, 0XA0H - 0XBFH)
12.4.1.4
Send Signaling Data through RxSer_n Pin
As mentioned in the above sections, signaling information embedded in the incoming E1 PCM data can be
sent to either the RSRA register array and/or sent through the Receive Signaling Output pin, at the same time,
the signaling data will be directed to the Receive Serial Data Output pin together with other incoming E1
payload data. The external equipment can thus still extract signaling data from the received E1 payload data
separately.
12.4.1.5
Signaling Data Substitution
After channel conditioning, the signaling conditioning can be optionally enabled by the RSCR registers. The
actual signaling bits in each channel can be replaced either with all ones or with signaling bits stored in the
Receive Substitution Signaling Register (RSSR). To enable signaling substitution, the Receive Signaling
Substitution Enable bit of the Receive Signaling Control Register (RSCR) has to be set to one. The table below
shows configuration of the Receive Signaling Substitution Enable bit of the Receive Signaling Control Register.
RECEIVE SIGNALING CONTROL REGISTER (RSCR) (INDIRECT ADDRESS = 0XN2H, 0XA0H - 0XBFH)
As mentioned before, the actual signaling bits in each channel can be replaced either with all ones or with
signaling bits stored in the Receive Substitution Signaling Register (RSSR). The table below shows
configurations of the Receive Substitution Signaling Register.
RECEIVE SUBSTITUTION SIGNALING REGISTER (RSSR) (INDIRECT ADDRESS = 0XN02H, 0X80H -
0X9FH)
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
5
Receive Signaling
Output Enable
R/W
0 - The XRT84L38 framer will not send extracted signaling bits from the
incoming E1 payload data to external equipment through the Receive
Overhead Output pin (RxOH_n).
1 - The XRT84L38 framer will send extracted signaling bits from the incom-
ing E1 payload data to external equipment through the Receive Overhead
Output pin (RxOH_n).
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
6
Receive Signaling
Substitution
Enable
R/W
0 - Signaling Substitution is disabled. The XRT84L38 framer will not
replace extracted signaling bits from the incoming E1 payload data with all
ones or with signaling bits stored in RSSR registers.
1 - Signaling Substitution is enabled. The XRT84L38 framer will replace
extracted signaling bits from the incoming E1 payload data with all ones or
with signaling bits stored in RSSR registers.
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
7-4
Reserved
R/W
3
SIG16-A
SIG4-A
SIG2-A
Sixteen-Code Signaling bit A
Four-Code Signaling bit A
Two-Code Signaling bit A