def __init__(self, numSNBits=16):
"""Initialize the packet format. By default use 16 bits for seq.nums.
Arguments:
numSNBits:Integer -- number of bits for the sequence numbers in
the packet format.
"""
PointToPointDL.__init__(self)
self._newFrame = None # We need the window size before creating PDUs.
self._sendBuffer = {} # Dictionary: SN --> Bitstream
self._retransmissionTimer = {} # Dictionary: SN --> Timer
self._transmitQueue = [] # List of frames to transmit
self._SN_MODULO = 2**numSNBits
if (2 * numSNBits) % 8 != 0:
padLen = 8 - (2 * numSNBits) % 8
self._newFrame = formatFactory(
[
('SN', 'BitField', numSNBits, 0), # Sequence number
('RN', 'BitField', numSNBits, 0), # Acknowledged SN
('pad', 'BitField', padLen,
0), # Padding to align to octets
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)
], # Checksum: CRC32.
self)
else:
self._newFrame = formatFactory(
[
('SN', 'BitField', numSNBits, 0), # Sequence number
('RN', 'BitField', numSNBits, 0), # Acknowledged SN
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)
], # Checksum: CRC32.
self)
def __init__(self,numSNBits=16):
"""Initialize the packet format. By default use 16 bits for seq.nums.
Arguments:
numSNBits:Integer -- number of bits for the sequence numbers in
the packet format.
"""
PointToPointDL.__init__(self)
self._newFrame = None # We need the window size before creating PDUs.
self._sendBuffer = {} # Dictionary: SN --> Bitstream
self._retransmissionTimer = {} # Dictionary: SN --> Timer
self._transmitQueue = [] # List of frames to transmit
self._SN_MODULO = 2**numSNBits
if (2*numSNBits) % 8 != 0:
padLen = 8 - (2*numSNBits)%8
self._newFrame = formatFactory(
[('SN', 'BitField', numSNBits, 0), # Sequence number
('RN', 'BitField', numSNBits, 0), # Acknowledged SN
('pad', 'BitField', padLen, 0), # Padding to align to octets
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)], # Checksum: CRC32.
self)
else:
self._newFrame = formatFactory(
[('SN', 'BitField', numSNBits, 0), # Sequence number
('RN', 'BitField', numSNBits, 0), # Acknowledged SN
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)], # Checksum: CRC32.
self)
def __init__(self):
PointToPointDL.__init__(self)
self._newFrame = formatFactory(
[('SN', 'BitField', 1, 0), # Sequence number: 1 bit, defaul: 0
('RN', 'BitField', 1, 0), # Acknowledged SN: 1 bit, default: 0
('pad', 'BitField', 6, 0), # Padding to align to octet boundaries
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)], # Checksum: CRC32.
self)
def __init__(self):
PointToPointDL.__init__(self)
self._newFrame = formatFactory(
[
('SN', 'BitField', 1, 0), # Sequence number: 1 bit, defaul: 0
('RN', 'BitField', 1, 0), # Acknowledged SN: 1 bit, default: 0
('pad', 'BitField', 6,
0), # Padding to align to octet boundaries
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)
], # Checksum: CRC32.
self)
def __init__(self):
PointToPointDL.__init__(self)
self._newFrame = formatFactory(
[('DstAddr', 'Int', 8, 0), # Destination address
('SrcAddr', 'Int', 8, 0), # Source address
('SN', 'BitField', 1, 0), # Sequence number: 1 bit, defaul: 0
('RN', 'BitField', 1, 0), # Acknowledged SN: 1 bit, default: 0
('pad', 'BitField', 6, 0), # Padding to align to octet boundaries
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)], # Checksum: CRC32.
self)
self._transmitQueue = [] # List of frames to transmit
self._computeBackoff = self._fixedBackoff
self._VR = {}
self._VS = {}
def __init__(self):
PointToPointDL.__init__(self)
self._newFrame = formatFactory(
[
('DstAddr', 'Int', 8, 0), # Destination address
('SrcAddr', 'Int', 8, 0), # Source address
('SN', 'BitField', 1, 0), # Sequence number: 1 bit, defaul: 0
('RN', 'BitField', 1, 0), # Acknowledged SN: 1 bit, default: 0
('pad', 'BitField', 6,
0), # Padding to align to octet boundaries
('data', 'ByteField', None, None), # Payload
('FCS', 'Int', 32, None)
], # Checksum: CRC32.
self)
self._transmitQueue = [] # List of frames to transmit
self._computeBackoff = self._fixedBackoff
self._VR = {}
self._VS = {}
