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Technical Specifications
10-12 Issue 3 June 2001
— Alarm status.
DS3 Low-Speed (BBG4/4B) 10
■ 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.
Line buildout is provisionable as follows:
— 734A/D: 0 to 450 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:
— Loss of signal (LOS)
— Line coding violations (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.
■ Performance Monitoring (see Table 10-23)
— DS3 parity errors (P-Bits)
— Severely errored frame seconds (SEFS).
If provisioned in the violation monitor and removal (VMR) or violation
monitor (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.
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