about the type of hardware, software version, and
active interfaces that the Cisco device is using. It uses
a SNAP frame between devices and is not routable.
specified when a connection is established. The allow-
able fluctuation levels for data samples taken by the
PCR in CBR transmissions are determined by the
CDVT. See also: CBR and PCR.
length of 53 bytes, including a 5-byte header that iden-
tifies the cell's data stream and 48 bytes of payload.
See also: cell relay.
speed edge and trunk interfaces (T3 or E3 circuits).
Cell payload scrambling rearranges the data portion
of a cell to maintain the line synchronization with cer-
tain common bit patterns.
cells to be processed and switched in hardware at high
speeds, making this technology the foundation for
ATM and other high-speed network protocols. See
also: cell.
Centrex has no on-site switching capability. There-
fore, all customer connections return to the CO. See
also: CO.
in a transmission within a certain span of time.
channel, supporting DDR, Frame Relay, and X.25.
Compare with: channelized T1.
D-channel of 64Kbps each, where individual channels
supporting DDR, Frame Relay, and X.25. Compare
with: channelized E1.
security feature that identifies the remote end, helping
keep out unauthorized users. After CHAP is per-
formed, the router or access server determines whether
a given user is permitted access. It is a newer, more
secure protocol than PAP. Compare with: PAP.
taken through a sequence of mathematical functions,
typically placed at the end of the data from which it is
calculated, and then recalculated at the receiving end
for verification. Compare with: CRC.
sending rate.
and BGP4, based on the concept of ignoring the IP
class of address, permitting route aggregation and
VLSM that enable routers to combine routes in order
to minimize the routing information that needs to be
conveyed by the primary routers. It allows a group of
IP networks to appear to other networks as a unified,
larger entity. In CIDR, IP addresses and their subnet
masks are written as four dotted octets, followed by a
forward slash and the numbering of masking bits (a
form of subnet notation shorthand). See also: BGP4.
connects a host mainframe to a control unit. This
device eliminates the need for an FBP to attach
channels.
Relay network's agreed-upon minimum rate of trans-
ferring information.
connection first--just like making a phone call.