Preliminary Information
MT9076
Framing Algorithm
T1/J1 Mode
E1 Mode
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Synchronizes with D4 or ESF protocols
Supports SLC-96 framing
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MT9076 contains 3 distinct and independent
framing algorithms
1. Basic frame alignment
Framing circuit is off-line
2. Signaling multiframe alignment
3. CRC-4 multiframe alignment
Transparent transmit and receive modes
Transparent transmit and receive modes
In D4 mode the Fs bits can optionally be
cross checked with the Ft bits
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Automatic interworking between interfaces
with and without CRC-4 processing
capabilities is supported
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The start of the ESF multiframe can be
determined by the following methods:
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Free-run
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An automatic reframe is forced if 3
consecutive frame alignment patterns or
three consecutive non-frame alignment bits
are received in error
Software reset
Synchronized to the incoming multiframe
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An automatic reframe is initiated if the
framing bit error density exceeds the
programmed threshold
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In transparent mode, no reframing is forced
by the device
In transparent mode, no reframing is forced
by the device
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Software can force a reframe at any time
Software can force a multiframe reframe at
any time
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Software can force a reframe at any time
In ESF mode the CRC-6 bits can be
optionally confirmed before forcing a new
frame alignment
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E-bits can optionally be set to zero until CRC
synchronization is achieved
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Optional automatic RAI
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During a reframe the signaling bits are frozen
and error counting for Ft, Fs, ESF framing
pattern and CRC-6 bits is suspended
Supports CAS multiframing
Optional automatic Y-bit to indicate CAS
multiframe alignment
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If J1 CRC-6 is selected the Fs bits are
included in the CRC-6 calculation
J1 CRC-6 and J1 Yellow Alarm can be
independently selected
Supports robbed bit signaling
Line Coding
T1/J1 Mode
E1 Mode
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B8ZS or AMI line coding
Pulse density enforcement
Forced ones insertion
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HDB3 or AMI line coding
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MITEL [ MITEL NETWORKS CORPORATION ]
