ATM


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia.

atm

(mechanics)

ATM

atm

Abbr. for “atmosphere.”

ATM

(communications)

ATM

(2)
Automatic Teller Machine - a cash dispenser.

ATM

(chat)
At the moment.

ATM

(text)

ATM

(1) See also ATM machine and Adobe Type Manager.

(2) (ATMosphere) A measure of pressure. See atmosphere.

(3) "At the moment." See digispeak.

(4) (Asynchronous Transfer Mode) A local area and wide area network technology stemming from the telephone world that supports quality of service (QoS) for real-time voice and video. In the early 1990s, ATM was touted as the future multimedia transport starting at the desktop. A decade later, ATM was being replaced by Internet protocols (see IP and MPLS). Adapters for PCs were expensive, and standards for connecting legacy networks were confusing. When Gigabit Ethernet debuted at the end of the 1990s with a familiar technology and 10-fold speed increase, ATM's demise as a LAN was assured. However, ATM was deployed as a backbone technology in major telcos and ISPs.

Fixed-Size Cells and Logical Circuits
ATM transmits 53-byte cells that can be processed very quickly, and the small cell ensures that voice and video can be inserted into the stream for real-time transmission. ATM uses switches that establish a logical circuit from end to end. However, unlike the dedicated circuits of legacy telephone switches, unused bandwidth in ATM's circuits can be appropriated as needed. For example, idle bandwidth in a videoconference can be used to transfer data.

Five Service Levels
Constant Bit Rate (CBR) guarantees bandwidth. Real-time Variable Bit Rate (rt-VBR) supports multimedia, and non-real-time Variable Bit Rate (nrt-VBR) is used for bursty traffic. Available Bit Rate (ABR) adjusts bandwidth according to LAN congestion levels, and Unspecified Bit Rate (UBR) provides the best effort for non-critical data. See MPOA.


ATM in the Large Enterprise
ATM was used as a network backbone ("switch fabric") in some large enterprises. The edge device is an Ethernet switch, and the LANE (LAN Emulation) driver converts Ethernet frames into ATM cells. See LANE.







ATM in the Internet
ATM has been used by carriers and ISPs as the backbone between points of presence (POPs) and at interconnecting points (see NAP and MAE). Highly scalable, ATM supports transmission speeds up to 10 Gbps but can run as slow as 9.6 Kbps between ships at sea. When a new ATM switch is added, it is automatically updated using ATM's PNNI routing protocol.







Where ATM Fits In
ATM functions at layer 2 of the OSI model and converts its cells into SONET frames (see OC) or T-carrier frames (see DS).
References in periodicals archive ?
The Bankers' Association of the Philippines has said that commercial, thrift and rural banks cannot unilaterally adjust ATM fees.
2019-020 that was issued by the BSP last July 19, detailing "BSP's expectations relative to ATM fees including the process which banks should comply with."
Like a day before the ATM at Mutindwa was robbed, G4S personnel had just loaded it with Sh7 million.
Brian Krebs, an American investigative journalist, explains in an online article how criminals have been stealing millions of shillings from banks in the US through ATM jackpotting.
That means Cashzone now loses money on some ATMs unless a fee is added - and it called on financial regulators to intervene.
Currently, India has approximately 238,000 ATMs installed, of which around 113,000 ATMs, including 100,000 off-site and more than 15,000 white label ATMs, are expected to down shutters, said CATMi Director V Balasubramanian.
In total, around 100 protected ATMs have been identified as no longer transacting between February and August - but there may be various reasons why many would not need replacing, such as they may be near a Post Office which has free access to cash or located on premises which are not open to the public generally.
"The cost associated with rolling out these ATMs was what led me to Dolphin Debit.
'Out of that number, 69 ATMs were installed in provincial sites in line with our commitment to bring banking services to the underserved areas,' she said.
Cardless ATMs are certainly a way to improve the customer experience by eliminating the need to carry and replace cards, which can be easily lost or compromised, as well as reduce the cost to the institution to replace them.
The bank's Group Head of E-Business, Mr Chuma Ezirim, said in a statement in Lagos on Monday that the bank also accounted for 37 percent bill payment services on ATMs in the nation's banking industry.
"ATM Jackpotting has actually been around for a few years in various forms, but hackers need to have access to the machine physically or through the bank network to pull this off," Don Duncan, security engineer for Vancouver, British Columbia, Canada based NuData said.