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Technical Specifications
Issue 3 June 2000
10-5
DS3 Low-Speed (BBG4/BBG4B)
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, 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:
— 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
settable to 10
-3
or 10
-6
BER.
■
PM (see Table 10-3 and 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 10-2), 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.
Table 10-2. DS3 Interface Modes
Mode
Monitor P-Bits Correct P-Bits
VMR mode Yes Yes
VM mode Yes No
CC mode No No
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