Gestetner A193 Service Manual page 767

1.2.1. Data Format
The machine logs the details of layer 1 communication whenever a event has
taken place. The event can be either a request from the machine, a request
from the DSU, a transmission of a signal, or a reception of a signal.
Each log consists of 4 bytes. The first byte indicates the type of event, the
second and the third bytes for optional data, which depends on the type of
event, and the fourth byte indicates the layer 1 status. The following table ex-
plains all types of data formats.
1st byte
00(H): TE mode
initialization request
01(H): Layer 1
activation request
10(H): Layer 1
status has changed
02(H): Frame
transmission request
20(H): Frame
reception indication
03(H): TEI
assignment request
04(H): Layer 1
de-activation request
05(H): Loop back
mode request
06(H): NT mode
initialization request
EE(H):
Communication error
The data "FF FF FF FF" indicates the end of the data.
APPENDIX A
2nd byte
00(H)
See note 1
00(H)
See note 3
Assigned TEI value
See note 4
00(H)
00(H)
See note 5
A-2
D-Channel Layer 1 Dump List
How to Read the Dump List
3rd byte
00(H)
See note 2
Number of
transmitted data
bytes
(Max. 255 bytes)
Number of received
data bytes
(Max. 255 bytes)
00(H)
See note 2
00(H)
00(H)
00(H)
4th byte
Layer 1 status
TE mode
F1(H): F1 status
F2(H): F2 status
F3(H): F3 status
F4(H): F4 status
F5(H): F5 status
F6(H): F6 status
F7(H): F7 status
F8(H): F8 status
NT mode
C1(H): G1 status
C2(H): G2 status
C3(H): G3 status
C4(H): G4 status
Refer to the "Layer
1 Activation/
Deactivation
Procedure" later in
this chaper.
SM