VARC - TL45
Signal diagram variations common for incoming and outgoing traffic
Format
VARC = D1D2D3D4D5D6D7D8 |
||
D1D2D3D4D5D6D7= |
0000000 |
Reserved. |
D8 = |
0 - 7 |
See Table 1. |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
Central Office, CO type |
. |
. |
. |
. |
. |
. |
. |
. |
Common control central office, CC |
X |
X |
X |
X |
. |
. |
. |
. |
Step by step, SBS |
. |
. |
. |
. |
X |
X |
X |
X |
Trunk type |
. |
. |
. |
. |
. |
. |
. |
. |
Loop CO |
X |
. |
. |
. |
X |
. |
. |
. |
DID |
. |
X |
. |
. |
. |
X |
. |
. |
Ground CO |
. |
. |
X |
. |
. |
. |
X |
. |
Tie line |
. |
. |
. |
X |
. |
. |
. |
X |
Function
The parameter states the signal diagram variations common for incoming and outgoing traffic.
Parameter VARC is mandatory.
Note: The DMI mode configuration should be in CCS signalling.
The 24th channel is reserved for signalling if any assigned channel on the same board is in CCS signalling.
The board configuration (ZERO, FRM and DMI) can only be assigned the same value for the different trunks of the same board.
The CO trunk can only support dial tone as proceed-to-send.
The DID trunk can only support wink start as proceed-to-send.
The B-answer is never received from the CO trunk.
Example
Blocking on excessive slip |
Common channel ... |
Trunk type |
Ground CO |
VARC = 00000002