Справочник Пользователя для 3com SuperStack II

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To order ISDN service for a Siemens EWSD switch, provide the phone 
company with the information in Table 36.

When you request services, you may also need the following information 
about SPIDs and other service attributes:

■

Request multipoint, initializing terminal service; the maximum number 
of terminals is two. The service provider supplies you with two SPIDs.

■

If you request ISDN service from an AT&T 5ESS service provider and 
the switch is running custom (or non-National ISDN 1) software, the 
format is:

01 + 7-digit telephone number + 1-digit suffix. 

■

If you request a different telephone numbers for each B channel, the 
suffix can be the same. A suffix of 0 is typical in this case. If you decide 
to use the same telephone number for both B channels, use a 
different suffix so that the two SPIDs are unique.

■

If you request NI-1 (National ISDN 1) service from an AT&T 5ESS 
service provider, the format is: 

01 + 7-digit telephone number + 1-digit suffix + 2-digit TID (terminal 
identifier). 

Table 37   Ordering ISDN Service for a Siemens EWSD Switch

Line Type

National ISDN 1 line

Line Code

2B1Q (2B+D)

Interface Type

S/T interface with NT1 (model 43x) or 
U interface (model 44x) and RJ-45 jack

Circuit-switched Option

Yes

Bearer Restriction Option

No packet mode data (NOPMD)

Protocol

PPP

SPID suffix

1

Terminal Endpoint Identifier (TEI)

Dynamic

Ring

No

Maximum Keys

64

Key System (EKTS)

No

Voice or Data

Data

Lower Layer Compatibility Option for Data

B channels