363-206-305
Technical Specifications
10-44
Issue 3 June 2000
SONET Overhead Bytes
10
The DDM-2000 FiberReach Multiplexer currently uses the K2 byte in the SONET
format for synchronization signaling. The reserved V4-byte in the VT1.5
superframe is used for internal fault detection in a DDM-2000 FiberReach
Multiplexer. This internal usage of the V4-byte may cause the value of the
transmitted V4-byte to vary.
The DDM-2000 FiberReach Multiplexer does not depend on, and always ignores,
the value of the V4-byte received on its optical interface.
Performance
10
Wander/Jitter
10
■
The OC-1 interface accommodates at least 10 microseconds of wander per
24-hour period without buffer overflow or depletion.
■
For SONET optical interfaces, the maximum time interval error (MTIE)
does not exceed 60 nanoseconds phase variation when timed with a
wander-free reference.
■
Jitter transfer, tolerance, and generation requirements are met as specified
in TR-253 and TR-499.
■
The SONET interfaces meet the T1.101 OC-N output short-term stability
mask.
Signal Performance
10
The DDM-2000 FiberReach Multiplexer significantly exceeds the following
specifications for the standard networks, as defined in TR-499, Issue 5.
■
For systems interfacing at the DS1 rate, the number of errored seconds,
during a two-hour, one-way loopback test, is less than ten.
■
The bit error rate (BER) is less than 10
-9
for both the DS1 and DS3 rates.
Burst-errored seconds are excluded.
■
The frequency of burst-errored seconds, other than those caused by
protection switching induced by hard equipment failures, averages less
than four per day.
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