BusinessPhone Communication Platform 4.0
Dialogs

## BTUB ISDN Layer 2 Error Counter

You can read out the ISDN Layer 2 error- * counters that are generated by the BTU-B firmware.

Note

This dialog uses unsupported RPJOB messages to retrieve the information!

The first part of the dialog shows the BTU-B cards. The link refers to a dialog with more detailed information.

### CES / TEI:

The CES (Connection Endpoint Suffix) is a value that is selected by the layer 2 management entity. BMS needs this value to address the specific data link layer (DLL). Each data link layer has a unique TEI-value (Terminal Endpoint Identifier), which is only known by layer 2. To exchange raw data between layer 2 and layer 3, only the CES-value is used.

##### Valid TEI values:

- 0 ... 63
  Non-automatic TEI, programmed with BMS command 14xx or programmed in the TE.
- 64 ... 126
  Automatic TEI, used by the NETWORK layer 2 management entity for TEI-assignment procedures.
- 255
  TEI value unassigned.

#### STA - Layer 2 State:

The STA value indicates the actual layer 2 data link state.

##### Valid STA values are:

Passive |  | 0 |
TEI unassigned |  | 1 |
Assign awaiting TEI |  | 2 |
Establish awaiting TEI |  | 3 |
TEI assigned |  | 4 |
Awaiting establish |  | 5 |
Awaiting release |  | 6 |
Multiple frame established |  | 7 |
Timer recovery |  | 8 |

#### Error list:

The display shows the following pre-defined layer 2 error codes:

Error type | Error condition | Error code
Receipt of unsolicited response | Supervisory (F=1) | A
DM (F=1) | B
UA (F=1) | C
UA (F=0) | D
DM (F=0) | E
Peer initiated re-establish. | SABME | F
Unsuccessful retransmission (N200 times) | SABME | G
DISC | H
Status enquiry | I
Other | N(R) error | J
Receipt of FRMR response | K
Receipt of frame with undefined control field | L
Receipt of I frame not permitted | M
Receipt of frame with wrong size | N
N201 error | O

| Value
Card | Shows the used card
Link | Shows the used link of the card
Type of Network | User to network or private, network to private
Type of Bus | Point to point or multipoint
CES | Connection Endpoint Suffix
TEI | Terminal Endpoint Identifier
STA | Layer 2 State

#### Actions

Back |  | To return to the card and link overview. |
Clear |  | To clear the error counter of the displayed link. |

Revision: A © Ericsson Enterprise 2003