Telos NX12 User Manual download pdf (Page 120)

110 | Appendix 2

interfaces to the telephone network. In some circles ‘PBX’ implies

a manual switchboard whereas ‘PABX’ (Private Automatic branch

exchange) implies a PBX that supports dialing by end users.

Many PBX’s can now oﬀer ISDN BRI service, usually over the S

Interface. A few vendors are now oﬀering BRI over the U interface

as well. PRI over DSX-1/T1 or E1 is also oﬀered in some cases. Be

wary of these ISDN protocols since they have not been as well tested

as the versions running on “public” switches. ey may or may not

work with a given piece of CPE.

PIC- Primary Interexchange Carrier. (USA) is is your default “1+”

carrier used for interLATA calls. In some areas you may have two

PICs, one for interLATA calls, and one for intraLATA long distance

calls (in which case it stands for Primary Intraexchange Carrier). In

some areas intraLATA long distance calls are still handled by your

RBOC, in others you now have a choice. You may be able to discover

who you current PIC is by dialing 700 555-4141.

PMP (USA) - AT&T “Custom Point to Multi-Point” Custom

ISDN Protocol. Not supported by the Zephyr or ZephyrExpress.

See Custom ISDN and ISDN Protocol.

POP - Point Of Presence. e local facility where your IEC main-

tains a switch. is is where your long distance calls get routed so

that your IEC can handle them. Also used to describe the local access

point of an Internet Service Provider.

POT- Plain Old Telephone. A black, rotary-dial desk phone. Usually

a Western Electric model 500 set. Outdated term.

POTS – Plain Old Telephone Service. Regular old-fashioned analog

loop start phone service.

PRI – ISDN Primary Rate Interface- A form of ISDN with 23

“B Channels” and one “D channel”. All 24 channels are on a single

cable. Functionally related to T1 telephone circuits. In Europe PRI

has 30 “B Channels” and one “D Channel” and one “Sync channel”.

See also B channel and D channel.

Provisioning -e act of conﬁguring an ISDN or other telecom-

munications path. Also refers to the complete line conﬁguration

information.

PS2 Power - Power provided on pins 7 and 8 of the “S” interface

cable. is power is used so that a NT1 can provide power to a ter-

minal (usually a phone). In some cases, it is used to allow a terminal

to power an NT1. e USA versions of the Zephyr and ZephyrEx-

press supply PS2 power in the “S” jack. e Zephyr Xstream and

Telos TWO provide this on all versions. is power arrangement is

also used in the Telos TWOx12 and 2101 Studio Interface to power

Desktop Directors.

PTP (USA)- AT&T “Custom Point to Point” Custom ISDN Pro-

tocol. Point-to-Point lines have only one incoming phone number

which must be dialed twice to connect to both lines (the ﬁrst call

goes to “line 1” and the second call rolls over to “Line 2”. See Cus-

the street” who compare the coded audio to the original and grade

the relative quality.

MSN/DN 1&2 (Zephyr Xstream)- e Telco menu selections on

the Xstream where the MSN (Euro & INS 64 ISDN) or 7 digit

Directory Numbers (USA ISDN) can be entered during set up. e

Zephyr Xstream generally does not require that these numbers be

present. See Directory Number and MSN.

MSN- Multiple Subscriber Number (Euro ISDN). is is a

telephone number associated with an ETS 300 BRI line. Provid-

ers of ETS 300 often give you three MSNs with a BRI, although

additional MSNs can be purchased. An ISDN terminal will “ring”

(provide an alerting signal) only when calls are made to the MSN

(or MSNs) entered in that terminal. If a terminal has no MSNs

entered, it will “ring” whenever there is a call to any of the MSN’s

on that BRI. See ETS 300 and DN.

National ISDN (USA & Canada)- e US “standardized” multi-

platform ISDN protocol. e ﬁrst version is National ISDN-1. As

of mid 1996 National ISDN-2 has been implemented in some areas

and is fully backward compatible with National ISDN-1.

NCTE – Network Channel Terminating Equipment. NCTE is a

general term that can be applied to a CSU or NT1 or other equip-

ment terminating a digital line at the customer’s premises. In many

countries, the NCTE is provided by the Telco. e USA is not one

of those countries.

Network Channel Terminating Equipment. See NCTE.

Network Termination - See NT

Nortel- Manufacturer of the DMS-100 switch as well as many

other pieces of telecom and network equipment. Now called Nortel

Networks.

NT - Network Termination - e electrical and protocol speciﬁca-

tions for the user end of an ISDN line. See also LT.

NT-1- An alternative expression for NT1. See NT1

NT1- Network Termination Type 1. e termination at the

customer premises of an ISDN BRI circuit. e NT1 performs the

role of line termination of the “U” interface and Codes/Decodes

from the line’s 2B1Q coding scheme. e customer end of the NT1

interfaces using the “S” or “T” interface. e NT1 is frequently

part of the “Terminal Adapter” and is built-in to Zephyr Xstream,

Zephyr, ZephyrExpress, Telos TWO and TWOx12 systems sold in

the USA & Canada. See also NCTE

NTBA- Network Termination Basic Access. e term used for

NT1 in some countries. See NT1. See also NCTE.

OOS – Out of Service. An alarm light or condition on a T1 or

trunk.

PBX- Private Branch Exchange. A privately owned switch. Basi-

cally, a PBX is a private “business” telephone system which also

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