參數(shù)資料
型號： XRT86VL38_1
廠商： Exar Corporation
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù)： 26/66頁
文件大小： 425K
代理商： XRT86VL38_1
XRT86VL38
23
OCTAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION
REV. V1.2.0
TRANSMIT OVERHEAD INTERFACE
S
IGNAL
N
AME
420 P
KG
B
ALL
#
484 P
KG
B
ALL
#
T
YPE
O
UTPUT
D
RIVE
(
M
A)
D
ESCRIPTION
TxOH0
TxOH1
TxOH2
TxOH3
TxOH4
TxOH5
TxOH6
TxOH7
C12
A18
E26
J25
AF25
AD14
AF10
AC2
E13
B16
E21
J18
W17
AA11
U11
AA1
I
-
Transmit Overhead Input (TxOHn):
The exact function of these pins depends on the mode
of operation selected, as described below.
DS1 Mode
These pins operate as the source of Datalink bits which
will be inserted into the Datalink bits within an outbound
DS1 frame if the framer is configured accordingly.
Datalink Equipment can provide data to this input pin
using the TxOHCLKn clock at either 2kHz or 4kHz
depending on the transmit datalink bandwidth selected.
N
OTE
:
This input pin will be disabled if the framer is
using the Transmit HDLC Controller, or the
TxSER input as the source for the Data Link
Bits.
E1 Mode
These pins operate as the source of Datalink bits or Sig-
naling bits depending on the framer configuration, as
described below.
Sourcing Datalink bits from TxOHn:
The E1 transmit framer will output a clock edge on TxO-
HCLKn for each Sa bit that has been configured to carry
datalink information. Terminal equipment can then use
TxOHCLKn to provide datalink bits on TxOHn to be
inserted into the Sa bits within an outbound E1 frame.
Sourcing Signaling bits from TxOHn:
Users must provide signaling data on TxOHn pins on
time slot 16 only. Signaling data (A,B,C,D) of channel 1
and channel 17 must be inserted on the TxOHn pin dur-
ing time slot 16 of frame 1, signaling data (A,B,C,D) of
channel 2 and channel 18 must be inserted on the
TxOHn pin during time slot 16 of frame 2...etc. The CAS
multiframe Alignments bits (0000 bits) and the extra
bits/alarm bit (xyxx) must be inserted on the TxOHn pin
during time slot 16 of frame 0.
N
OTE
:
These 8 pins are internally pulled “Low” for each
channel.
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