Verilink Access Manager 2000 (896-502037-001) Product Manual User Manual
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Access Manager 2000 Manual
A-3
Bit Error Rate
Threshold
A bit error rate (BER) level above in which a CSU alarm is generated
and reported to Access Manager 2000.
Bipolar Eight-Zero
Substitution
A physical layer of protocol for implementing a pattern that replaces
eight consecutive ZERO bits. This pattern includes two intentional
bipolar violations (BPVs) that would otherwise indicate transmission
errors. Using B8ZS allows for 64 kbps per DS-0 with unlimited zeros.
Bipolar Violation
A violation of the T1 bipolar AMI transmission pattern requiring
successive ONEs (pulses) to be transmitted as pulses of opposite
polarities. BPVs normally indicate transmission errors. B8ZS patterns
contain intentional BPVs, which are not counted as errors.
Bipolar Violation
Count
The number of bipolar violations (BPVs) occurring over a given period
of time.
Blue Alarm Signal
See ALL-ONEs.
Bps
Bits per second; a basic unit of measure for serial data transmission.
kbps (kilobits per second) indicates a transmission rate of 1000’s bps
BPV
See Bipolar Violation.
Bursty Errored
Second
A second having between 2 and 319 CRC-6 (Cyclical Redundanc
Checksum) error events.
Byte
In most cases, an 8-bit quantity of information used mainly in parallel
data transfer or data storage. Also referred to as an octet.
C
Cable
An assembly of one or more conductors within a protective sheath,
made so as to permit the use of the conductors separately or in groups.
Carrier Registers
These registers store the previous 24 hours’ performance monitoring
data accumulated as ESs, UASs, BESs, SESs, and LOFCs, plus the
current interval’s ESs, UASs, BESs, SESs, and LOFCs. There is also an
ESF Error Event register, which provides a continuous count of ESF
error events. The carrier registers can be read by both the carrier (telco)
and end user, but they can be reset only by the carrier.
Channel
In communications, a physical or logical path allowing the
transmission of information to flow from point-to-point.
Term
Definition