Gestetner A193 Service Manual page 744

Bit Switch 16: D channel layer 3 (Approval)
FUNCTION
0 Answer delay time
Bit 1 0 Setting
1
0 0 No delay
0 1 1.0 s delayed (1TR6)
1 0 0.5 s delayed (CNET)
1 1 Not used
2 Action when receiving [SETUP]
signal containing user-specific
callrd party subaddress
0: Ignores the call
1: Receives the call
3 Not used
4
5 Indicated bearer capabilities
0: 56 kbps 1: 64 kbps
6 Not used
7
Bit Switch 17: CPS Code Used for G4 to G3 Fallback - 1
FUNCTION
0 Condition for fallback from G4 to G3
to Bits 0 to 6 of bit switch 17 contain a CPS code, and bits 0 to 6 of bit switch 18 contain
6
another CPS code. If a CPS code is received which is the same as either of these,
communication will fall back from ISDN G4 mode to ISDN G3 mode.
The CPS codes must be the same as those specified in table 4-13 of CCITT
recommendation Q.931.
Examples: Bit 6 5 4 3 2 1 0
1 0 0 0 0 0 1 CPS code 65
1 0 1 1 0 0 0 CPS code 88
For the codes in bits 0 to 6 of bit switches 17 and 18 to be recognized, bit 7 of bit
switch 17 must be 1. Also, bit 0 of the Communication Switch 07 must be at 0, or
Fallback from G4 to G3 will be disabled.
(A644) ISDN
COMMENTS
In Germany (1TR6) and France (CNET), a time delay
to answer a call is required.
In other countries, use this switch as follows:
If the machine is connected to the same bus from the
DSU as a model K200 is connected, the machine
receives most of the calls because the response time
to a call is faster than the K200.
If the customer wants the K200 to receive most of the
calls, adjust the response time using these bits.
If the customer does not want one machine to receive
most of the calls, use subaddresses to identify each
terminal.
Normally, the 3rd octet of called party subaddress
information in the [SETUP] signal is set to NSAP.
However, some networks may add "user-specific"
subaddress to the [SETUP] signal (UK), and the
result of this is that the machine won't answer the call
if a subaddress is specified.
So, change this bit to 1 to let the machine receive the
call if the machine is connected to such a network.
Do not change the factory settings.
1: 64 kbps calling is indicated in the Bearer
Capabilities, but communication is at 56 k. Use this
bit if the machine is connected to a network which
does not accept a 56 kbps data transfer rate as a
bearer capability.
Do not change the factory settings.
COMMENTS
2-7
BIT SWITCHES
SM