363-206-305
Technical Specifications
Issue 3 June 2000
10-7
DS3 Data Services Interface (BBG19)
10
■
Electrical Specification
The low-speed DS3 interface transmits and 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.
— Mini-coax (KS-19224, L2): 0 to 150 ft.
— 735A: 0 to 250 ft.
■
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.
■
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
settable to 10
-3
or 10
-6
BER.
■
Performance Monitoring (See Table 10-3 and Table 10-23.)
— DS3 parity errors (P-Bits)
—SEFS.
If provisioned in the VMR or VM modes (Table 10-2), 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.
■
Enhanced DS3 Performance Monitoring (See Table 10-23 and Table 10-3.)
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.
The DS3 interface is accessed through a BNC connector on the circuit
pack faceplate.
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