CSIS 160
Josh Ancel
Chapter 16
- Traffic
– communications the common
carriers are transporting
- Busy
Hour (BH) – what call processing loads and capacities are measured
- Grade
of Service – is an index number representing the probability that a call
will be blocked or delayed during the busy hour due to all the shared
equipment being in use.
- CCS & TU’s -
Centum Call Second and Traffic Units are 60 sequential calls of one minute duration each, or
one call of 60 minutes duration.
- CCIS (Common Channel Interoffice
Signalling)- is where control
orsupervisory signals are sent on a separate data link between switching
offices. CCIS links operate at 4800 bps, or baud. Signal Transfer Points
in the switch send the supervisory information over the dedicated link. This
prevents supervisory tones from subscriber stations to register with the
telephone network as a change in trunk status.
- SS-7 – The international standard that is used
for signaling on telephone networks.
- SSP
- Service Switching Points are
signaling points that are used in SS-7 high speed data signaling networks.
- STP
– Signaling Transfer Points – a version of packet switch to route the
signaling messages between SSP’s.
- SCP-
Service Control Points - is the
data base or memory for the system and has huge capacities used for 800
alternate billings.
- ISDN
- Integrated Services Digital Network (ISDN) was specified by the CCITT
standards body (now known as ITU-T) as long ago as 1984. It was originally
designed as a "next generation" telephone system, integrating
voice and data into one connection. The ISDN Basic Rate Interface (or BRI)
is a standard connection you would have in any home or small business,
offering two simultaneous connections (any mix of fax, voice and data).
When used as a data connection, ISDN BRI can offer two independent data
channels of 64kbps each, or 128kbps when combined into one connection. The
ISDN Primary Rate Interface (or PRI) offers 30 channels (of 64kbps each),
giving a total of 1920kbps. As with BRI, each channel can be connected to
a different destination, or they can be combined to give a larger
bandwidth. These channels, known as "bearer" or "B"
channels, are at the heart of the flexibility of ISDN.
- 2B1Q
– 2 Bits 1 Quartemary – The line code used
in an ISDN network that is based on one consideration that in andy stream
of 1 and 0 ther can appear four possible pair combinations. AMI – Alternate Mark Inversion – a line
code also used in ISDN, a digit 1 is transmitted as a pulse and 0 as a no
pulse.
- Basic Rate Interface (BRI) - An ITU-T
Integrated
Services Digital Network (ISDN)
multipurpose user
interface
standard that denotes the capability of simultaneous voice and data
services provided over two clear 64-kb/s channels and one clear 16-kb/s channel
(2B+D) access
arrangement to each user location.
- Primary Rate Interface - Primary Rate Interface channels are
carried on a T-carrier system line (in the U.S.,
Canada, and Japan) or an E-carrier line (in other countries) and are
typically used by medium to large enterprises. The 23 (or 30) B-channels
can be used flexibly and reassigned when necessary to meet special needs
such as videoconferences. The Primary Rate user is hooked up directly to
the telephone company central office
- N & X used in numbering Plan – X - Any Number, N – Any Number Except 1 or a 0.
- LNP – Local Number Portability – The ability to
to retain you old telephone number when you chose a new LEC.
- LAN – Local Area Network - A computer
network
that spans a relatively small area. Most LANs are confined to a single
building or group of buildings. However, one LAN can be connected to other
LANs over any distance via telephone lines and radio waves. A system of LANs
connected in this way is called a wide-area
network (WAN).