AT&T DEFINITY 7200 series - Manual (Page 114)

5-10 ELECTRONIC TANDEM NETWORK (ETN) THROUGH THE ETN AND PNA PACKAGES
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SWITCHED
ACCESS
NPA-NXX-XXX
EQUAL
ACCESS
END OFFICE LEC
PNI
SO
SO
SO
SO
SO
SDN
DIRECT
ACCESS
4-DIGIT 7-DIGIT
PNI
0- TO 7-
DIGIT
7- OR 10-
DIGIT
S85/
G2
DIM
FP8
S75/
G1
NCP
ACP ACP
AT&T SDN
S85/
G2
S85/
G2
ETN
S75/
G1
DIM
FP8
S75/
G1
S85/
G2
ETN
S75/
G1
DID (4 OR 5 DIGIT)
SDN ACTION POINT.
DIRECT INWARD DIALING.
AT&T DIMENSION 2000 WITH FEATURE PACKAGE 8.
LOCAL EXCHANGE CARRIER.
SDN NETWORK CONTROL POINT.
PRIVATE NETWORK INTERFACE. A DEDICATED CONNECTION BETWEEN SDN
AND A PRIVATE NETWORK (IN THIS CASE, ETN).
AT&T SERVING OFFICE.
AT&T SYSTEM 75 OR GENERIC 1
AT&T SYSTEM 85 OR GENERIC 2.
ACP -
DID -
DIM FP8 -
LEC -
NCP -
PNI -
SO -
S75/G1 -
S85/G2 -
LEGEND:
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.