Ericsson G36 User Manual download pdf (Page 20)

Communications systems built to drive business ahead

MD Evolution 8.1

Product News

PN 06:16 Rev A 2006-10-20

Created by ESF/KEP/MA Francois Vaillant

With the new version MDE 8.1 supported by the CAP2 board, the North

American ISDN standards are now supported. It is the Primary Rate Access PRA

called T1 that has 23 B + 1 D channels (1.5 Mbits/s). Voice codec is in µ-law.

Compliance with US and Canada ISDN protocols:

o National ISDN 2 or NI-2 (document SR-NWT-002120). The last

version is called National ISDN 2000 (document SR-4994)

o Lucent DMS 100 or DMS100 (document NIS A211-1)

Note the old ISDN protocol 5ESS (document TR41459) is not supported.

T1 implementation

The T1 service is only available on the MD Evolution M/Mi/EBN systems, not

on the MD Evolution XL/Xli systems.

The MDE-M/Mi system accepts only one CAP2 board that has one ISDN

T1/E1 port. The CAP2 board is plugged in the slot 8. No settings on this board.

New parameters are introduced in the MDE database. This involves a new

format of the database with the new version MDE 8.1; then when upgrading an

installed MD-M system, it requires the conversion of the database to the new

format. Refer to the software downloading procedures.

Channel administration

- The range of channels in use can be defined by their number (1-24 or 1-32)

- When setting a call, the system can ask for preferred/ exclusive channel to be

used

- Selection of channel done according to the algorithm "High-High" or "Low-

Low"

- T1 protocol requirements state that channels are set “out-of-service” only by

the public network (Therefore, there is no possibility to set this with the TLG

tool)

- to avoid collision between incoming and outgoing calls, the system selects a

free channel according to the parameter that dedicates the channel to

incoming/outgoing/ both-way call.

En-bloc dialing is required with the two US protocols.

Dialing and call routing are adapted to start dialing on the network after the end

of dialing by the caller. Thus the system should know when the caller dials the

last digit. Three criteria are available:

- Inter-digit timeout,

- Defined character at the end of dialing (generally "#"),

- Or the number of dialed digits is greater than the

defined maximum number of dialed digits.

Then a manual dialing requires the last character ("#") to avoid waiting the

timeout elapses. Other services also require this character when programming

them:

- Call forwarding to an external telephone number,

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