DS21Q41B Datasheet, PDF (1/61 Pages) Dallas Semiconductor – Quad T1 Framer

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DS21Q41B
Quad T1 Framer
FEATURES
§ Four T1 DS1/ISDN-PRI framing transceivers
§ All four framers are fully independent
§ Frames to D4, ESF, and SLC-96 formats
§ 8-bit parallel control port that can be
connected to either multiplexed or non-
multiplexed buses
§ Each of the four framers contains dual two-
frame elastic stores that can connect to
asynchronous or synchronous backplanes up
to 8.192 MHz
§ Extracts and inserts robbed bit signaling
§ Framer and payload loopbacks
§ Large counters for BPVs, LCVs, EXZs,
CRC6, PCVs, F-bit errors and the number of
multiframes out of sync
§ Contains ANSI 1s density monitor and
enforcer
§ CSU loop code generator and detector
§ Programmable output clocks for Fractional
T1, ISDN-PRI, Actual Size and per channel
loopback applications
§ Onboard FDL support circuitry
§ Pin-compatible with DS21Q43 Quad E1
Framer
§ 5V supply; low power CMOS
§ Available in 128-pin TQFP
§ Industrial (-40°C to +85°C) grade version
available (DS21Q41BTN)
FUNCTIONAL DIAGRAM
RECEIVE
FRAMER
ELASTIC
STORE
TRANSMIT
FORMATTER
ELASTIC
STORE
FRAMER #0
FRAMER #1
FRAMER #2
FRAMER #3
CONTROL PORT
ACTUAL SIZE
QUAD
T1
FRAMER
DESCRIPTION
The DS21Q41B combines four of the popular DS2141A T1 Controllers onto a single monolithic die. The
“B” designation denotes that some new features are available in the Quad version that were not available
in the single T1 device. The added features in the DS21Q41B are listed in Section 1. The DS21Q41B
offers a substantial space savings to applications that require more than one T1 framer on a card. The
Quad version is only slightly bigger than the single T1 device. All four framers in the DS21Q41B are
totally independent; they do not share a common framing synchronizer. Also, the transmit and receive
sides of each framer are totally independent. The dual two-frame elastic stores contained in each of the
four framers can be independently enabled and disabled as required. The DS21Q41B meets all of the
latest specifications including ANSI T1.403 (and the emerging T1.403-199X), ANSI T1.231-1993,
AT&T TR62411, AT&T TR54016, ITU G.704 and G.706.
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