Verilink AS2000: The Basics (880-502981-001) Product Manual Instrukcja Użytkownika Pobierz pdf (Strona 126)

Acronyms and Definitions

Glossary-6 Verilink Access System 2000: Basics

bit error rate (BER) The ratio of received bit errors to

the total number of bits received.

The time over which this rate is

calculated is not inherent to the

definition and can be separately

specified. For low error rates, the

cyclic redundancy check (CRC)

can be used to estimate the

bit

error rate (BER)

, assuming that

not more than one error will occur

per

Extended Superframe

Format (ESF)

bit error rate seconds (BERS) A count of one-second intervals in

which a bit error rate alarm

existed.

bit error rate threshold A

bit error rate (BER)

level above

which a CSU alarm is generated

and reported to the management

software.

bit-oriented A communications protocol or

method where control information

(for example, framing and

signaling) is encoded in fields of

one or more bits. This procedure

is distinct from byte-oriented

protocols, which require more

space (an entire byte at a time)

devoted to control and overhead.

Bit-oriented protocol is used in the

digital signal facility data link.

bit stuffing A data stream used to adjust the

different incoming rates of seven

DS2 signals before multiplexing

into the DS3 rate. The DS2 signals

can be asynchronous relative to

each other (because they may have

not been formed within a common

multiplexer) and therefore may be

operating at different rates.

bit/s Bits per second; a basic unit of

measure for serial data

transmission. High transmission

rates are given in kbit/s (kilobytes

per second) measuring thousands

of bits per second; or Mbit/s,

measuring millions of bits per

second.

blue alarm A received alarm indication signal

of unframed all ones from the

network service provider.

bps See

bit/s

BPV See

bipolar violation (BPV)

BPV count The number of

bipolar violation

(BPV)

occurring over a given

period of time.

1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 178 179

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