Technical Specifications
Issue 8.0 July 2002
10-17
Transmission Characteristics 10
The FT-2000 OC-48 Lightwave System meets single-mode interoffice digital fiber optic
systems requirements and objectives as specified in GR-253-CORE and TR 499.
DS3 Access 10
!
CAUTION:
All DS3 signal outputs from the FT-2000 OC-48 Lightwave System must be
properly terminated at all times. Therefore, these outputs must be
connected to DSX-3 cross-connect panels that have internal 75-ohm
terminations (for example, Lucent Technologies cross-connect panels meet
this requirement) or other working transmission equipment (for example,
DACS III-2000 Cross-Connect System or DDM-2000 Multiplexer) where the
associated low speed interfaces are equipped. When operating the FT-2000
OC-48 Lightwave System with cross-connect panels that do not
automatically terminate the DS3 signal outputs, 75-ohm termination plugs
must be placed at the cross-connect panel.
In releases prior to Release 7, if DS3 output ports are not terminated with
75-ohms, false trouble conditions could be reported by the FT-2000 OC-48
Add/Drop-Rings Terminal. In Release 7 and later releases, it is still
recommended that DS3 output ports be terminated properly. However, if
unterminated ports in the drop direction (from OC-48 line) are in the AUTO
state, false trouble conditions will not be reported by the FT-2000 OC-48
Add/Drop-Rings Terminal.
Error Rate........................................................ <10
-9
accumulated error rate for
systems up to 400 kilometers (250 miles)
Maximum Repeater Spacing ........................... 60 kilometers at 1.3 µmon0.46dB/km
fiber
Maximum Repeater Spacing ........................... 92 kilometers at 1.5 µmon0.28dB/km
fiber (dispersion limited)
Interface........................................................... Standard DS3 interface as specified in
T1.102-1987
Growth Increment............................................ Three DS3s per circuit pack; ports can
be provisioned one at a time
Line Code ........................................................ Bipolar 3-zero substitution (B3ZS)
Protection Ratio............................................... 1xM (M≤16)
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