ds265188-port-t1-e1-j1-transc Maxim Integrated Products, Inc., ds265188-port-t1-e1-j1-transc Datasheet - Page 59
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ds265188-port-t1-e1-j1-transc
Manufacturer Part Number
ds265188-port-t1-e1-j1-transc
Description
Ds26518 8-port T1/e1/j1 Transceiver
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS265188-PORT-T1-E1-J1-TRANSC.pdf
(313 pages)
- Current page: 59 of 313
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9.9.4.4 Receive SLC-96 Operation (T1 Mode Only)
In an SLC-96-based transmission scheme, the standard Fs-bit pattern is robbed to make room for a set of
message fields. The SLC-96 multiframe is made up of six D4 superframes, hence it is 72 frames long. In the 72-
frame SLC-96 multiframe, 36 of the framing bits are the normal Ft pattern and the other 36-bits are divided into
alarm, maintenance, spoiler, and concentrator bits as well as 12-bits of the normal Fs pattern. Additional SLC-96
information can be found in BellCore document TR-TSY-000008.
To enable the DS26518 to synchronize onto a SLC-96 pattern, the following configuration should be used:
The SLC-96 message bits can be extracted via the T1RSLC1–3 registers. The status bit RSLC96 located at
RLS7.3 is useful for retrieving SLC-96 message data. The RSLC96 bit will indicate when the framer has updated
the data link registers T1RSLC1–3 with the latest message data from the incoming data stream. Once the RSLC96
bit is set, the user will have 9ms (or until the next RSLC96 interrupt) to retrieve the most recent message data from
the T1RSLC1–3 registers. Note that RSLC96 will not set if the DS26518 is unable to detect the 12-bit SLC-96
alignment pattern.
•
•
•
•
RCR1.5 (RFM) = 1
RCR1.3 (SYNCC) = 1
T1RCR2.4 (RSLC96) = 1
RCR1.7 (SYNCT) = 0
Set to D4 framing mode.
Set to cross-couple Ft and Fs bits.
Enable SLC-96 synchronizer.
Set to minimum sync time.
59 of 313
DS26518 8-Port T1/E1/J1 Transceiver
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