AT&T 7500 series ユーザーズマニュアル

PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS

8-29

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Private Terrestrial Connections Through

ACCUNET

Spectrum of Digital Services (ASDS)

The requirements for using ASDS for PBX-to-PBX connections are given in table 8-8.

Table 8-8. Requirements for PBX-to-PBX Private Network Spectrum Connections

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COMM TYPE

TRUNK TYPE

FACILITIES CALL

________________________________

RECOMMENDED NETWORK

NOTES

SETUP DATA

MODULE

CHANNEL

S75 G1

S85 G2

(R2V3/V4)

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Robbed Bit Dedicated or Data Data

TT†=109 TT=41 Mode 1 = MPDM/M1* AMI

1,2,3,

through Dial-up

(DMI)

7500B

4,5

Fractional T1
(see figure
8-21)

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









† TT stands for trunk type.

Notes:

1. Dedicated circuits are provided via permanent switched connections (PSC) on the System 75 and

Generic 1; and dedicated switched connections (DSC) on the System 85 (R2V3 and R2V4) and
Generic 2. DSC amd PSC connections cannot be used together.

2. On the System 85 or Generic 2, trunk type DMI does not allow subnet trunking to be used with

AAR/ARS. In addition, with DMI, no modem pooling is allowed and the bearer capability class
must be set appropriately.

3. If an MPDM is used, it must be installed with a V.35 interface and an

ACCUNET

SW56 modification

kit.

4. The 7500B can only be used with the Generic 2 communications system.
5. At present, ASDS must be provisioned as a voice-grade channel (that is, TC- or TA-type). Spectrum

data channels do not support signaling trunks. DSC supports non-signaling B-channels, PSC does
not. Spectrum data channels require the ability to loop back at channel level using DDS commands.
The MPDM is not compatible.