AT&T 7500 series, 7100 series, 2500 series Feasible ETN/SDN Configuration, Call Routing SDN to ETN

5-10ELECTRONIC TANDEM NETWORK (ETN) THROUGH THE ETN AND PNA PACKAGES

____________________________________________________________________________________________________________________________

_

EQUAL

ACCESS

END OFFICE

AT&T SDN

SWITCHED

ACCESS

DID (4 OR 5 DIGIT)

LEC S75/ G1

NPA-NXX-XXX

S85/

G2

ETN

S85/

G2

	NCP
7- OR 10-
DIGIT
PNI
	ACP
SO
0- TO 7-
DIGIT
S75/
G1
	SO
7-DIGIT	4-DIGIT
SDN	S75/
	G1
DIRECT
ACCESS

ACP

SO

DIM

FP8

	PNI
	SO
	S75/
SO	G1

S85/

G2

ETN

DIM FP8

S85/

G2

LEGEND:

ACP - SDN ACTION POINT.

DID - DIRECT INWARD DIALING.

DIM FP8 - AT&T DIMENSION 2000 WITH FEATURE PACKAGE 8.

LEC - LOCAL EXCHANGE CARRIER.

NCP - SDN NETWORK CONTROL POINT.

PNI - PRIVATE NETWORK INTERFACE. A DEDICATED CONNECTION BETWEEN SDN

AND A PRIVATE NETWORK (IN THIS CASE, ETN).

SO - AT&T SERVING OFFICE.

S75/G1 - AT&T SYSTEM 75 OR GENERIC 1

S85/G2 - AT&T SYSTEM 85 OR GENERIC 2.

Figure 5-5.Feasible ETN/SDN Configuration

Call Routing — SDN to ETN

To route a call from a non-ETN location through SDN to an ETN location, the following steps occur (see figure 5-6):

1.The caller dials the destination 7-digit (RNX-XXXX) or 10-digit (NPA-NXX-XXXX) number.

2.The originating switch passes the 7-digit number onto the AT&T serving office, which forwards the call onto the nearest ACP.

3.The ACP queries the NCP database, which returns the routing number.