363-206-285
Technical Specifications
Issue 3 June 2001
10-15
DS3 Data Services Interface (BBG19) 10
â– Electrical Specification
The low-speed DS3 interface transmits/receives a standard electrical DS3
signal as specified in
ANSI
T1.102-1993, Section 5 (44.736 Mb/s rate,
DSX-3 interconnect specification, bipolar 3-zero substitution [B3ZS]
encoding). However, the signal does not have to contain a standard DS3
frame.
LBO is provisionable as follows:
— 734A/D: 0 to 450 ft.
— 735A: 0 to 250 ft.
â– Format Specification
The DS3 low-speed interface provides clear channel transport of any
DSX-3 compatible signal (M13 mode, framed clear channel, unframed
clear channel). Thus, there are no format requirements on this interface.
â– Alarm Thresholding
The following parameters are monitored at the DS3 interface to the DSX-3:
— LOS
— CV-L.
The alarm level for each of the monitored parameters can be provisioned to
CR, MJ, MN, or status. B3ZS coding violation failure threshold is user
settableto10
-3
or 10
-6
BER.
â– Performance Monitoring (see Table 10-23)
— DS3 parity errors (P-Bits)
—SEFS.
If provisioned in the VMR or VM modes (Table 10-3), DS3 P-bit violations
and SESF are counted, and the counts are thresholded to flag detected
performance degradation of the DS3 signal incoming from the fiber.
â– Enhanced DS3 Performance Monitoring (see Table 10-23 and Table 10-4)
The Enhanced DS3 PM for the BBG19 is the same as for the BBG4/
BBG4B. Refer to the DS3 Low-Speed (BBG4/4B) Enhanced DS3
Performance Monitoring section for a list of parameters.
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