Specifications

HighWire MTP-2 - 1.2, September 4, 2002 Common Header Sub-Structures 55
link_parms
link_parmslink_parms
link_parms MTP2 link parameters.
link_parms.error_correction_method
error_correction_methoderror_correction_method
error_correction_method
Specifies the error correction method to be used. This field can take the
following values:
• CBI_ERR_METHOD_BASIC
• CBI_ERR_METHOD_PCR
link_parms.transmission_rate
transmission_ratetransmission_rate
transmission_rate
Specifies the transmission rate of the link (in bits/second) and implies
the transmission type (56 and 64 kbits, or faster imply digital; 4.8 kbits
implies analog). Note that CBI_XMIT_RATE_MBITS1_5 is used to denote
1.5 Mbit/s for ITU and 1.536 Mbit/s for ANSI. This field can take the
following values:
• CBI_XMIT_RATE_KBITS4P8
• CBI_XMIT_RATE_KBITS56
• CBI_XMIT_RATE_KBITS64
• CBI_XMIT_RATE_MBITS1_5
• CBI_XMIT_RATE_MBITS2_0
link_parms.loop_delay
loop_delayloop_delay
loop_delay
Loop delay. The time, in milliseconds, between the sending of a message
signal unit and the reception of the acknowledgement for that message
signal unit in normal operation.
link_parms.sequence_num_bits
sequence_num_bitssequence_num_bits
sequence_num_bits
Number of bits in sequence number. The maximum FSN and BSN values
in an SU are one less than two to the power of this parameter.
link_parms.send_msu_window
send_msu_windowsend_msu_window
send_msu_window
Maximum number of outgoing MSUs available for retransmission. This
value is used by both the BER and PCR error correction methods. In the
PCR case, it corresponds to the Q703 N1 parameter. A value of zero
means that there is no maximum (other than the constraint imposed by
the available FSN values).
link_parms.send_octet_window
send_octet_windowsend_octet_window
send_octet_window
Maximum number of outgoing octets available for retransmission. This
value is used by both the BER and PCR error correction methods. In the
PCR case, it corresponds to the Q703 N2 parameter. A value of zero
means that there is no maximum.
link_parms.rcv_msu_window
rcv_msu_windowrcv_msu_window
rcv_msu_window
Maximum number of unprocessed incoming MSUs that may be held by
the underlying device at any one time.
max_proving_attempts
max_proving_attemptsmax_proving_attempts
max_proving_attempts
Maximum number of failed proving attempts before the link returns to the Out
of Service state. This is the Q703 AERM M parameter.