The txcfg.txt T1/E1 configuration command determines whether a TX board's trunk is configured as E1 (e1cfg), T1 (t1cfg), or J1 (j1cfg) mode. The configuration command consists of an identifier for the trunk being configured (1 through 4 for PCI and PCI Express TX boards, 1 through 8 for CompactPCI TX boards) and parameters specifying the circuit framing, line encoding, line buildout (T1/J1 only), and loop master configuration. This configuration statement defines the most common attributes of a trunk interface. Each T1/E1 command also supports an optional command that can be used to configure less common options for the given trunk type (E1 (e1opt), T1 (t1opt), J1 (j1opt)). Options must be specified before the trunk configuration command is specified.
This topic presents:
Use the txcfg.txt e1cfg command to configure a trunk as an E1 interface. The information provided by the e1cfg command is combined with any information provided in previous e1opt commands to produce the full E1 trunk configuration information.
The E1 trunk configuration statement syntax is:
e1cfg trunk_num framing encoding master
where trunk_num is the trunk number to configure (1 through 4 for PCI and PCI Express TX boards, 1 through 8 for CompactPCI TX boards) and framing is one of the following values:
|
Value |
Description |
|
ccs |
Clear channel signaling (double frame format). |
|
cas |
Channel associated signaling. |
|
ccsrc |
Clear channel signaling (CRC4 multiframe format). |
|
casrc |
Channel associated signaling (CRC4 multiframe format). |
where encoding is one of the following values:
|
Value |
Description |
|
nozcs |
AMI encoding with no zero code suppression. |
|
hdb3 |
High density bipolar order 3. |
where master is one of the following values:
|
Value |
Description |
|
true |
Local side of connection acts as timing source for this circuit. |
|
false |
Remote side of connection acts as timing source. |
Use the e1opt command to control all E1 trunk configuration options that are not specified by the e1cfg command. The e1opt command does not send configuration requests to the TX board; the command modifies the optional configuration information attached to the E1 trunk configuration request issued by the e1cfg command. Because the E1 configuration options are not reset by an e1cfg command, all E1 options can be specified once and used for the configuration of each E1 trunk. A single e1opt command can be used to set up to 15 different options. Multiple e1opt commands can also be used.
The E1 trunk configuration options statement syntax is:
e1opt ! flag name value name=value
where:
|
Parameter |
Description |
|
! |
Clear a flag. Use to disable an option that is enabled by default. |
|
flag name |
Flag to set, or clear if ! is specified. Refer to E1 option flags. |
|
value name |
Value to change. Refer to E1 option values. |
|
value |
New value for named parameter. |
The following table lists the E1 option flags. If the default of the specified option flag is SET, use ! flag name to clear the flag.
|
Flag name |
Description |
|
EXZE |
Extended code violation or excessive zero detection. |
|
ALM |
Standard by which AIS is detected. SET = ITU-T G.775; CLEAR = ETS300233. Default is SET. |
|
SA6Y |
Detection of Sa6-bit pattern done synchronously to multiframe. |
|
EXTIW |
Extended CRC4 to non-CRC4 interworking (search after 400 ms). Default is SET. |
|
AXRA |
Remote alarm bit set automatically if receiver in asynchronous state. Default is SET. |
|
CRCI |
Automatic CRC (4) bit inversion. |
|
XCRCI |
Transmission of CRC (4|6) bit inversion. |
|
DCOXC |
Center function of transmission circuitry enabled. |
|
ALMF |
Automatic loss of multiframe alignment when excessive CRC errors. Default is SET. |
|
AXS |
Automatic transmission of submultiframe status. Default is SET. |
|
EBP |
In asynchronous state, E-bit is set (valid only if AXS is set). Default is SET. |
|
DAIS |
Automatic AIS insertion disabled. |
|
DAXLT |
Automatic high impedance transmission pins on short detect disabled. |
|
DXJA |
Internal transmit jitter attenuation disabled. |
|
DCF |
Center function of receive circuitry disabled. |
|
AFR |
Automatic search for double frame alignment disabled. |
|
XSIS |
First bit of the service word. Default is SET. |
|
XSIF |
Transmission of spare bit for international use (FAS word). Default is SET. |
|
XS13 |
Transmission of spare bit (frame 13, CRC-multiframe). Default is SET. |
|
XS15 |
Transmission of spare bit (frame 15, CRC-multiframe). Default is SET. |
|
SWD |
Loss of synchronization based on service word disabled. |
|
ASY4 |
Four consecutive incorrect FAS words cause LOS (CLEAR = 3). |
|
EQON |
-43 dB receiver (long haul mode). CLEAR = -10 dB (short haul). |
|
RLM |
Receiver mode for receive line monitoring. |
|
CLOS |
Received data is cleared as soon as LOS detected. |
|
SCF |
Corner frequency of DCO-R reduced by factor of 10 to 0.2 Hz. |
|
Option name |
Default |
Valid range |
Description |
|
XP0 |
E1_XPM_0 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 1st level). |
|
XP1 |
E1_XPM_1 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 2nd level). |
|
XP2 |
E1_XPM_2 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 3rd level). |
|
XP3 |
E1_XPM_3 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 4th level). |
|
RIL |
0x02 |
0x00 through 0x07 |
Receive input threshold. |
|
SLT |
0x02 |
0x00 through 0x03 |
Voltage threshold when receive slicer generates mark. |
|
PCD |
0x0A |
0x00 through 0xFF |
LOS alarm generated if no transmission in 16x(pcd+1) consecutive pulses. |
|
PCR |
0x15 |
0x00 through 0xFF |
LOS alarm cleared if pcr+1 pulses in detect interval. |
|
XY |
0x1F |
0x00 through 0x1F |
Spare bits for national use. |
Use the txcfg.txt t1cfg command to configure a trunk as a T1 interface. The information provided by the t1cfg command is combined with information provided in previous t1opt commands to produce the full T1 trunk configuration information. As a variant of the standard T1 trunk configuration, use the j1cfg command to configure the trunk in J1 mode. The syntax for both the t1cfg and the j1cfg commands is identical.
The T1 trunk configuration statement syntax is:
t1cfg trunk_num framing encoding build_out master
The J1 trunk configuration statement syntax is:
j1cfg trunk_num framing encoding build_out master
where trunk_num is the trunk number to configure (1 through 4 for PCI and PCI Express TX boards, 1 through 8 for CompactPCI TX boards) and framing is one of the following values:
|
Value |
Description |
|
d4 |
D4 (193S) framing: 12-frame multiframe format (F12, D3/4). |
|
f4 |
4-frame multiframe format (F4). |
|
esf |
Extended superframe format: 24-frame multiframe format (ESF). |
|
f72 |
72-frame multiframe format (F72, remote switch mode). |
where encoding is one of the following values:
|
Value |
Description |
|
nozsc |
AMI encoding with no zero code suppression. |
|
b7zs |
Bit 7 stuffing with zero code suppression. |
|
b8zs |
Bipolar eight zero substitution. |
where build_out is one of the following values:
|
Value |
Transmitter attenuation |
|
0 |
0 dB |
|
1 |
-7.5 dB |
|
2 |
-15 dB |
|
3 |
-22.5 dB |
where master is one of the following values:
|
Value |
Description |
|
true |
Local side of connection acts as timing source for this circuit. |
|
false |
Remote side of connection acts as timing source. |
Use the t1opt or j1opt command to control all T1 or J1 trunk configuration options that are not specified by the t1cfg or j1cfg command. The t1opt or j1opt command does not send configuration requests to the TX board; the command modifies the optional configuration information attached to the T1 or J1 trunk configuration request issued by the t1cfg or j1cfg command. Because the T1 and J1 configuration options are not reset by a t1cgf or a j1cfg command, all T1 or J1 options can be specified once and used for the configuration of each T1 or J1 trunk. A single t1opt or j1opt command can be used to set up to 15 different options. Multiple t1opt or j1opt commands can also be used.
The T1 trunk configuration options statement syntax is:
t1opt ! flag name value name=value
The J1 trunk configuration options statement syntax is:
j1opt ! flag name value name=value
where:
|
Parameter |
Description |
|
! |
Clear a flag. Use to disable an option that is enabled by default. |
|
flag name |
Flag to set, or clear if ! is specified. Refer to T1 and J1 option flags. |
|
value name |
Value to change. Refer to T1 and J1 option values. |
|
value |
New value for named parameter. |
The following table lists the T1 and J1 option flags. If the default of the option flag is SET, use ! flag name to clear.
|
Flag name |
Description |
|
EXZE |
Extended code violation or excessive zero detection. |
|
SRAF |
F12: FS-bit of frame 12; ESF: bit 2 = 0. |
|
CRC |
CRC6 check or generation (ESF format only) enabled. Default is SET. |
|
AIS3 |
AIS detection only in asynchronous state. |
|
SSC2 |
LFA declaration if more than 320 CRC6 errors per second. |
|
RRAM |
Detection of remote (yellow) alarm allowed during bit error rates. |
|
LOS1 |
Additional condition for LOS alarm cleared: GR-499-CORE. |
|
SJR |
Alarm handling done according to ITU-T JG.704 and 706. Default is CLEAR (T1) and SET (J1). |
|
AXRA |
Remote alarm bit set automatically if receiver in asynchronous state. Default is SET. |
|
CRCI |
Automatic CRC(4) bit inversion. |
|
XCRCI |
Transmission of CRC(4|6) bit inversion. |
|
DCOXC |
Center function of transmit circuitry enabled. |
|
DAIS |
Automatic AIS insertion disabled. |
|
DAXLT |
Automatic high impedance transmission pins on short detect disabled. |
|
DXJA |
Internal transmit jitter attenuation disabled. |
|
DCF |
Center function of receive circuitry disabled. |
|
EQON |
-36 dB receiver (long haul mode). CLR = -10 dB ( short haul). |
|
RLM |
Receiver mode for receive line monitoring. |
|
CLOS |
Received data is cleared as soon as LOS detected. |
|
SCF |
Corner frequency of DCO-R reduced by a factor of 10 to 0.6 Hz. |
|
MCSP |
Multiple candidates synchronization procedure. |
|
SSP |
Synchronization procedure. |
|
Option name |
Default |
Valid range |
Description |
|
XP0 |
T1_XPM_0 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 1st level). Refer to Line buildout values. |
|
XP1 |
T1_XPM_1 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 2nd level). Refer to Line buildout values. |
|
XP2 |
T1_XPM_2 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 3rd level). Refer to Line buildout values. |
|
XP3 |
T1_XPM_3 (0xFF) |
0x00 through 0x1F |
Transmission of pulse shape mask (for 4th level). Refer to Line buildout values. |
|
RIL |
0x00 |
0x00 through 0x07 |
Receive input threshold. |
|
SLT |
0x02 |
0x00 through 0x03 |
Voltage threshold when receive slicer generates mark. |
|
PCD |
0x00 |
0x00 through 0xFF |
LOS alarm generated if no transmission in 16x(pcd+1) consecutive pulses. |
|
PCR |
0x00 |
0x00 through 0xFF |
LOS alarm cleared if pcr+1 pulses in detection interval. |
|
XY |
0x00 |
0x00 through 0x1F |
Spare bits for national use. |
|
SSC |
0x00 |
0x00 through 0x03 |
Synchronization conditions. |
The default values for the transmit pulse shape mask trigger the TX board to define the pulse shape according to the value of the EQON option flag and the value of the line buildout. These default values are tuned for each specific TX board type (and potentially fine-tuned to each specific trunk).