gould@pilot.njin.net (Brian Jay Gould) (11/30/88)
I'm trying to get some information on switched 56kbps services both by inter and intra-lata carriers. I dn't think anyone is using ISDN (right?), so the first question is.. 1) How do they initiate a call? via keypad? AT command set? separate port into DSU? I suspect that in most (all?) cases a dedicated link is required between the CO and the customer. 2) What kind of link is it? 56kbps digital? 64kbps digital? T1 required? I check the group, but direct E-mail would also be appreciated. ==> Any disclaimers made by me or anyone on my behalf, may or may not accurately represent my failure to be representing myself or others. -- ------------------------------------------------------------------------- - Brian Jay Gould :: INTERNET gould@jvnca.csc.org BITNET gould@jvncc - - UUCP rutgers!njin!gould Telephone (609) 520-2000 - - Sterling Software 220 Carnegie Center Princeton, NJ 08540 - ------------------------------------------------------------------------s
chip@vector.uucp (Chip Rosenthal) (12/02/88)
Brian Jay Gould (gould@pilot.njin.net) writes in issue 189: > I'm trying to get some information on switched 56kbps services [...] > 1) How do they initiate a call? via keypad? AT command set? [...] > I suspect that in most (all?) cases a dedicated link is required > 2) What kind of link is it? 56kbps digital? 64kbps digital? T1 required? Basically the "Switched-56" service is just like a 56Kbps DDS leased line, except (1) you are charged by connect time rather than a fixed fee, and (2) it isn't an end-to-end line. For example, if you have lines into your Main Street, Elm Street, and Oak Avenue offices and you connect up from one office to either of the other two. So, you end up with a 56Kbps dedicated digital line in your facility. The "dialing" commands are but one of the network control codes which need to be transmitted over the line. I believe that the DTE must generate the dialing commands, unless there are intelligent DSU's which do this. Below is information from AT&T's 3/13/87 FCC tariff for Switched-56: 56kbps Switched Digital Service is furnished for the switching and transmission of simultaneous two-way 56 kbps digital signals. It consists of a common user digital network which is furnished between designated AT&T Central Offices. Service is available for use 24 hours a day, seven days a week. A call can access the 56 kbps Switched Digital Service network at designated AT&T Central Offices via an access line. Access lines are provided. Access lines are connected at the AT&T Central Office for switching to: - another access line for communications between two Customer's premises served by the same AT&T Central Office, or - the common user digital network for communications between two Customer's premises served by different AT&T Central Offices. Customer equipment is required to terminate a 56 kbps Switched Digital Service call. Technical Publication - PUB 41458 sets forth the network specifications of this equipment. __Mileage_Rates__ Airline Initial Period Each Add'l Period Mileage (30 sec) (6 sec) 0 $0.35 $0.06 1-100 $0.36 $0.06 101-500 $0.38 $0.07 501-1000 $0.43 $0.08 1001-up $0.47 $0.08 Possible documents of interest: AT&T TR41458 - Special Access Connections to the AT&T Communications Network for New Service Applications, October 1985, $60.00 AT&T TR41458A2 - Addendum to TR41458, February 1987, no charge Bellcore TR-880-22135-84-01 - Circuit Switched Digital Capability Network Interface Specifications, Issue 1, July 1984, $48.50 -- Chip Rosenthal chip@vector.UUCP | Choke me in the shallow water Dallas Semiconductor 214-450-5337 | before I get too deep.
chip@vector.uucp (Chip Rosenthal) (12/07/88)
Below is information from AT&T's 3/13/87 FCC tariff for Switched-56:
56kbps Switched Digital Service is furnished for the switching and
transmission of simultaneous two-way 56 kbps digital signals. It
consists of a common user digital network which is furnished between
designated AT&T Central Offices. Service is available for use 24
hours a day, seven days a week.
A call can access the 56 kbps Switched Digital Service network at
designated AT&T Central Offices via an access line. Access lines are
provided.
Access lines are connected at the AT&T Central Office for switching to:
- another access line for communications between two Customer's
premises served by the same AT&T Central Office, or
- the common user digital network for communications between two
Customer's premises served by different AT&T Central Offices.
Customer equipment is required to terminate a 56 kbps Switched Digital
Service call. Technical Publication - PUB 41458 sets forth the network
specifications of this equipment.
__Mileage_Rates__
Airline Initial Period Each Add'l Period
Mileage (30 sec) (6 sec)
0 $0.35 $0.06
1-100 $0.36 $0.06
101-500 $0.38 $0.07
501-1000 $0.43 $0.08
1001-up $0.47 $0.08
Possible documents of interest:
AT&T TR41458 - Special Access Connections to the AT&T Communications
Network for New Service Applications, October 1985, $60.00
AT&T TR41458A2 - Addendum to TR41458, February 1987, no charge
Bellcore TR-880-22135-84-01 - Circuit Switched Digital Capability
Network Interface Specifications, Issue 1, July 1984, $48.50
--
Chip Rosenthal chip@vector.UUCP | Choke me in the shallow water
Dallas Semiconductor 214-450-5337 | before I get too deep.