Telos NX12 user manual Appendix

110   Appendix 2

the street” who compare the coded audio to the original and grade the relative quality.

MSN/DN 1&2 (Zephyr Xstream)- The 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. The Zephyr Xstream generally does not require that these numbers be present. See Directory Number and MSN.

MSN- Multiple Subscriber Number (Euro ISDN). This 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)- The US “standardized” multi- platform ISDN protocol. The 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. The 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 - The 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. The termination at the customer premises of an ISDN BRI circuit. The NT1 performs the role of line termination of the “U” interface and Codes/Decodes from the line’s 2B1Q coding scheme. The customer end of the NT1 interfaces using the “S” or “T” interface. The 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. The 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

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. They may or may not work with a given piece of CPE.

PIC- Primary Interexchange Carrier. (USA) This 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. The local facility where your IEC main- tains a switch. This 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 -The 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. This 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. The USA versions of the Zephyr and ZephyrEx- press supply PS2 power in the “S” jack. The Zephyr Xstream and Telos TWO provide this on all versions. This 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-