Commands for all cards

The following parameters apply to more than one card type.

-a number

Set Transmitter clock source to number.

1	TxClk from modem	T1E1, HSSI	default
2	Internal source	T1E1, HSSI
3	RxClk from modem	T1E1, HSSIc	loop timed
4	External connector	T1E1, HSSIc

An HSSI card normally takes its Tx clock from the modem connector (it is a DTE) but can use the PCI bus clock (typically 33 MHz) for loopback and null modem testing; values 3 and 4 are only applicable to a few rare CompactPCI/HSSI cards.

A T1E1 card uses an on-board synthesized oscillator if the value is 1 or 2; it loop times (uses the clock recovered by the receiver as the transmitter clock) if the value is 3; and it uses a clock from a header connector on the card if the value is 4.

TxClk source is not applicable to other card types.

-b

Read BIOS ROM. Print the first 256 locations. The BIOS ROM is not used and not present on some cards.

-B

Write BIOS ROM. Write the first 256 locations with an address pattern.

-c

Use HDLC's 16-bit CRC polynomial: X^16+X^12+X^5+1 (default).

-C

Use HDLC's 32-bit CRC polynomial: X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X+1

-d

Clear the driver-level debug flag. Non-critical log messages are suppressed.

-D

Set the driver-level debug flag. The driver generates more log messages. The driver also generates more log messages if the interface-level debug flag is set by ifconfig(8).

-e

Set DTE (Data Terminal Equipment) mode (default). An SSI card transmitter uses the Tx clock signal from the modem connector and receives the Data Carrier Detect pin (DCD). DTE/DCE is not applicable to other card types except a few rare CompactPCI/HSSI cards.

-E

Set DCE (Data Communication Equipment) mode. An SSI card transmitter uses an on-board synthesized oscillator and drives the Data Carrier Detect pin (DCD).

-f number

Set the frequency of the built-in synthesized oscillator to number bits/second. The nearest frequency that the synthesizer can generate will be used. Only SSI cards and a few rare CompactPCI/HSSI cards have synthesizers.

-F

Set SPPP line protocol to Frame-Relay. Only works for FreeBSD 5.4 and later.

-h

Print help (usage message).

-i

Set interface name (e.g. “ lmc0”).

-L number

Set loopback mode to number.

1	none	default
2	payload	outward thru framer	T1E1. T3
3	line	outward thru line if	T1E1, T3, HSSIc
4	other	inward thru line if	T1E1, T3
5	inward	inward thru framer	T1E1, T3
6	dual	inward and outward	T1E1, T3
16	tulip	inward thru Tulip chip	all cards
17	pins	inward thru drvrs/rcvrs	SSI
18	LA/LL	assert LA/LL modem pin	HSSI, SSI
19	LB/RL	assert LB/RL modem pin	HSSI, SSI

-m

Read Tulip MII registers. Print the 32 16-bit registers in the Media Independent Interface.

-M addr data

Write Tulip MII register. Write data into register addr.

-p

Read Tulip PCI configuration registers. Print the first 16 32-bit registers in the PCI configuration space.

-P addr data

Write Tulip PCI configuration register. Write data into register addr.

-s

Read Tulip SROM. Print the 64 16-bit locations. The PCI subsystem vendor and device IDs are kept here.

-S number

Write Tulip SROM. Initializes the Tulip SROM to card type number.

3	HSSI
4	T3
5	SSI
6	T1E1
7	HSSIc
8	SDSL
0	auto-set from MII PHYID

If number is zero, then the card type is computed from the gate array microcode version field in the MII PHYID register. CAUTION: if the SROM is incorrect, the card will be unusable! This command is so dangerous that lmcconfig must be edited and recompiled to enable it.

-t

Read Tulip CSRs. Print the 16 32-bit control and status registers.

-T addr data

Write Tulip CSR. Write data into CSR number addr. Note that addr is a CSR number (0-15) not a byte offset into CSR space.

-u

Reset event counters to zero. The driver counts events like packets in and out, errors, discards, etc. The time when the counters are reset is remembered.

-U

Reset gate array. Not needed during normal operation; just for testing.

-v

Set verbose mode: print more stuff.

-V

Print the card configuration — see the EXAMPLES section.

-w

Load gate array from on-board ROM. Not needed during normal operation; just for testing.

-W filename

Load gate array microcode from filename.

-x

Select RAWIP mode — bypass line protocol code.

-X

Select line protocol code rather than RAWIP mode.

-y

Disable SPPP keep-alive packets.

-Y

Enable SPPP keep-alive packets.

-z

Set SPPP line protocol to Cisco-HDLC.

-Z

Set SPPP line protocol to PPP.

-?

Print help (usage message).

Commands for T1E1 cards

The following parameters apply to the T1E1 card type:

-a -Sm y | a | b Sm

Stop sending alarm signal.

y	Yellow Alarm	varies with framing
a	Red Alarm	unframed all ones; aka AIS
b	Blue Alarm	unframed all ones

Red alarm, also known as AIS (Alarm Indication Signal), and Blue alarm are identical in T1.

-A -Sm y | a | b Sm

Start sending alarm signal (see table above).

-B number

Send a Bit Oriented Protocol (BOP) message with code number. BOP codes are six bits.

-c number

Set cable length to number meters (default: 10 meters). This is used to set receiver sensitivity and transmitter line build-out.

-d

Print the status of the on-board DSU/CSU — see the EXAMPLES section.

-e number

Set the framing format to number:

9	T1-SF/AMI
27	T1-ESF/B8ZS (default)
0	E1-FAS
8	E1-FAS+CRC
16	E1-FAS+CAS
24	E1-FAS+CRC+CAS
32	E1-NO-framing

-E number

Enable 64Kb time slots (TSs) for the T1E1 card. The number argument is a 32-bit hex number (default 0xFFFFFFFF). The LSB is TS0 and the MSB is TS31. TS0 and TS25-31 are ignored in T1 mode. TS0 and TS16 are determined by the framing format in E1 mode.

-f

Read framer registers. Print the 512 8-bit registers in the framer chip.

-F addr data

Write framer register. Write data into register addr.

-g number

Set receiver gain range to number:

0x24	Short	0 to 20 dB of equalized gain
0x2C	Medium	0 to 30 dB of equalized gain
0x34	Long	0 to 40 dB of equalized gain
0x3F	Extend	0 to 64 dB of equalized gain (wide open)
0xFF	Auto	auto-set based on cable length (default)

This sets the level at which Loss-Of-Signal is declared.

-i

Send a CSU loopback deactivate inband command (T1-SF only).

-I

Send a CSU loopback activate inband command (T1-SF only).

-l

Send a line loopback deactivate BOP message (T1-ESF only).

-L

Send a line loopback activate BOP message (T1-ESF only).

-p

Send a payload loopback deactivate BOP message (T1-ESF only).

-P

Send a payload loopback activate BOP message (T1-ESF only).

-s

Print the status of the on-board DSU/CSU — see the EXAMPLES section.

-t

Stop sending test pattern.

-T number

Start sending test pattern number:

0	unframed X^11+X^9+1
1	unframed X^15+X^14+1
2	unframed X^20+X^17+1
3	unframed X^23+X^18+1
4	unframed X^11+X^9+1 with 7ZS
5	unframed X^15+X^14+1 with 7ZS
6	unframed X^20+X^17+1 with 14ZS (QRSS)
7	unframed X^23+X^18+1 with 14ZS
8	framed X^11+X^9+1
9	framed X^15+X^14+1
10	framed X^20+X^17+1
11	framed X^23+X^18+1
12	framed X^11+X^9+1 with 7ZS
13	framed X^15+X^14+1 with 7ZS
14	framed X^20+X^17+1 with 14ZS (QRSS)
15	framed X^23+X^18+1 with 14ZS

-u number

Set transmit pulse shape to number:

0	T1 DSX 0 to 40 meters
2	T1 DSX 40 to 80 meters
4	T1 DSX 80 to 120 meters
6	T1 DSX 120 to 160 meters
8	T1 DSX 160 to 200 meters
10	E1 75-ohm coax pair
12	E1 120-ohm twisted pairs
14	T1 CSU 200 to 2000 meters; set LBO
255	auto-set based on cable length and framing format (default)

-U number

Set transmit line build-out to number:

0	0 dB	FCC option A
16	7.5 dB	FCC option B
32	15 dB	FCC option C
48	22.5 dB	final span
255	auto-set based on cable length (default)

This is only applicable if the pulse shape is T1-CSU.

-v

Set verbose mode: print more stuff.

-x

Disable transmitter outputs.

-X

Enable transmitter outputs.

Commands for T3 cards

The following parameters apply to the T3 card type:

-a -Sm y | a | b | i Sm

Stop sending alarm signal.

y	Yellow Alarm	X-bits set to 0
a	Red Alarm	framed 1010... aka AIS
b	Blue Alarm	unframed all-ones
i	Idle signal	framed 11001100...

-A -Sm y | a | b | i Sm

Start sending alarm signal (see table above).

-B number

Send a BOP (Bit Oriented Protocol) message with code number. BOP codes are six bits.

-c number

Set cable length to number meters (default: 10 meters). This is used to set receiver sensitivity and transmitter line build-out.

-d

Print the status of the on-board T3 DSU — see the EXAMPLES section.

-e number

Set the framing format to number:

100	T3-C-bit parity
101	T3-M13 format

-f

Read framer registers. Print the 22 8-bit registers in the framer chip.

-F addr data

Write framer register. Write data into register addr.

-l

Send a line loopback deactivate BOP message.

-L

Send a line loopback activate BOP message.

-s

Print the status of the on-board T3 DSU — see the EXAMPLES section.

-S number

Set payload scrambler polynomial to number:

1	payload scrambler disabled
2	X^43+1: DigitalLink and Kentrox
3	X^20+X^17+1 w/28ZS: Larscom

Payload scrambler polynomials are not standardized.

-v

Set verbose mode: print more stuff.

-V number

Set transmit frequency offset to number. Some T3 cards can offset the transmitter frequency from 44.736 MHz. Number is in the range (0..4095); 2048 is zero offset; step size is about 3 Hz. A number is written to a Digital-Analog Converter (DAC) which connects to a Voltage Controlled Crystal Oscillator (VCXO).

Event Counters

The device driver counts many interesting events such as packets in and out, errors and discards. The table below lists the event counters and describes what they count.

ibytes

Bytes received in packets with good ending status.

obytes

Bytes transmitted.

ipackets

Packets received with good ending status.

opackets

Packets transmitted.

ierrors

Packets received with bad ending status.

oerrors

Packets transmitted with bad ending status.

idiscards

Packets received but discarded because the input queue was full or the interface was down.

odiscards

Packets presented for transmission but discarded because the output queue was full or the interface was down.

txdma

Packets presented for transmission but queued and retried later because no DMA descriptors were available. This can happen during normal operation and is not an indication of trouble.

fifo-overrun

Packets that started to arrive, but were aborted because the card was unable to DMA data to memory fast enough to prevent the receiver fifo from overflowing.

fifo-underrun

Packets that started to transmit but were aborted because the card was unable to DMA data from the memory fast enough to prevent the transmitter fifo from underflowing. When this happens, the transmitter threshold is increased, so that more bytes are required to be in the fifo before the transmitter is started.

missed

Packets that are missed because the receiver is stopped.

overruns

Packets that are missed because the receiver had no DMA descriptors available.

fdl_pkts

Packets received on the T1 Facility Data Link.

crc-errs

Cyclic Redundancy Checksum errors detected by the CRC-6 in T1 Extended SuperFrames (ESF) or the CRC-4 in E1 frames.

lcv-errs

Line Coding Violation errors: Alternate Mark Inversion (AMI) errors for T1-SF, Bipolar 8-Zero Substitution (B8ZS) errors for T1-ESF, or High Density Bipolar with 3-Zero Substitution (HDB3) errors for E1 or Bipolar 3-Zero Substitution (B3ZS) errors for T3.

frm-errs

T1 or T3 bit errors in the frame alignment signal.

febe-errs

Far End Block Errors: T1 or T3 bit errors detected by the device at the far end of the link.

par-errs

T3 bit errors detected by the hop-by-hop parity mechanism.

cpar-errs

T3 bit errors detected by the end-to-end parity mechanism.

mfrm-errs

T3 bit errors in the multi-frame alignment signal.

Transmit Speed

The hardware counts transmit clocks divided by 2048. The software computes “Tx speed” from this (see EXAMPLES below). The transmit clock is the bit rate of the circuit divided by two if the circuit is idle and divided by four if the circuit is carrying a packet. So an idle circuit reports a Tx speed equal to its bit rate, and a busy circuit reports a Tx speed equal to half its bit rate.

This “bit rate” does not include circuit-level overhead bits (such as T1 or T3 frame bits) but does include HDLC stuff bits. An idle T1 circuit with a raw bit rate of 1544000 and a bit-rate-minus-overhead of 1536000 will report a “Tx speed” of ((1536000 bitand 4095) plus or minus 4096). Sometimes it will even get the correct answer of 1536000, and if the link is fully loaded it will report about 768000 bits/sec.

It is not a perfect bit rate meter (the circuit must be idle), but it is a useful circuit utilization meter if you know the circuit bit rate and do some arithmetic. Software recalculates Tx speed once a second; the measurement period has some jitter.