HP ProCurve 7000dl Series Basic Management And Configuration Manual page 842

Appendix B: Glossary
Japanese
Hierarchy
J1 The base bandwidth multiple of J-carrier systems. J1-carrier systems consist
Kbps Kilobits per second. One thousand bits per second. A measure of bandwidth
Key In cryptography, a key is a unique value or string of text that is combined with
KS Key System. A key system is essentially a scaled-down PBX. Key systems
B-28
J
A digital signal hierarchy used in Japan for voice transmission. A J0 line is
defines a one channel. The Japanese hierarchy closely matches the T-carrier
system.
Table G-3. Japanese digital signal hierarchy
Physical DSD
carrier
— J0
J1 J1
J2 J2
J3 J3
J4 J4
of 24 J0 channels with a maximum transmission rate of 1.544 Mbps. The J1
standard is used for voice transmissions only.
K
on a data transmission medium. Higher bandwidths are more conveniently
expressed in Megabits per second (Mbps or millions of bits per second) or in
Gigabits per second (Gbps, or billions of bits per second).
data when that data is run through an encryption or hash algorithm. In order
to decrypt or dehash the data, a device must apply the correct key to the
transformed data. With symmetric keys, the same key encrypts and decrypts
(or hashes and dehashes) data. With asymmetric keys, a private key trans-
forms data and a public key reverses the transformation. The length of a key
generally determines how difficult it will be to decrypt the data.
typically have one unit, either an attendant phone or a separate box, that acts
as controller over a limited number of lines (usually about 4) for a limited
number of extensions (as many as 20).
J0 multiple J1 multiple
1 —
24 —
96 4
480 30
5760 240
Transmission
rate
64 Kbps
1.544 Mbps
6.312 Mbps
32.064 Mbps
397.200 Mbps