AT&T 7200 series, 7500 series, 7100 series, 2500 series Public and Private Data Network Connections

PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS 8-23

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∙Image viewing and transfer — Using slow-scan and freeze-frame capabilities, SDS and SDDN let senders and receivers jointly study databases, engineering drawings, and X-rays.

Connections to the Public SDN/SDDN Circuit-Switched Data Network

Requirements for connections from a PBX DS1 port to a public network destination through SDS or SDDN vary according to the type of signaling used (that is, robbed-bit or ISDN-PRI MOS), and the data speed. Data speed is set at the originating and destination data modules in the following DMI modes:

∙Mode 0 — 64-kbps synchronous transmission (PRI)

∙Mode 1 — 56-kbps synchronous transmission (robbed-bit or PRI)

∙Mode 2 — up to 19.2-kbps asynchronous transmission (PRI)

∙Mode 3 — 64-kbps packet data (PRI)

Figures 8-14through 8-16show some typical connections through both the domestic and international SDS/SDDN network. Table 8-6lists the requirements for the illustrated connections.

DTE

MPDM/M1*

OR

7500B

S75/S85

G1/G2

DS1 WITH SW56 SERVICE (ROBBED BIT)

4ESS

POP

PUBLIC

SWITCHED

DATA NETWORK

POP

4ESS

SW56 SERVICE

SW56K	DTE
DSU

Figure 8-14.Public Switched Data Network with Robbed Bit Facilities (Mode 1)