363-206-305
Technical Specifications
Issue 3 June 2000
10-5
DS3 Low-Speed (BBG4/BBG4B)
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, 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.
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:
— 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.
â–
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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