Description:
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v52CChannelTable OBJECT-TYPE
SYNTAX SEQUENCE OF V52CChannelEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Communication Channel (C-channel). C-paths (see
v52CPathTable) are carried over C-channels (communications
channels). In V5, there are two types of C-channels,
logical and physical. Information about logical and
physical C-channels is included in the provisioning
data for V5.2 interfaces. A C-path associated with a
logical C-channel is protected. A C-path associated with
a physical C-channel is not protected.
In V5.2 only, logical C-channels carry a group of one
or more C-paths, excluding the C-paths for the protection
protocol. A logical C-channel may consist of the C-paths
for the Control, Link Control, and BCC protocols. Another
logical C-channel may consist of the C-path for the PSTN
protocol. A third logical C-channel may consist of the
C-paths for ISDN Ds-type data and ISDN p-type data. A V5.2
interface may contain up to 44 logical C-channels and each
logical C-channel on an interface is uniquely identified
in V5.2 with a 16-bit logical C-channel identifier.
The goal of the protection protocol is to protect the C-paths
for the V5 Signaling protocols (ie, BCC, Control, etc)
as well as the C-paths for ISDN D-channel data. However,
the protection protocol is designed to protect logical
C-channels, not C-paths. Therefore, in order to protect
a C-path, it must be associated with a logical C-channel.
This association is made as part of the provisioning variant.
A physical C-channel consists of a time slot (64kbit/s) on
an E1 that carries a C-channel (C-channels are used to
carry signaling traffic). All physical C-channels are
restricted to timeslots 16, 15, and 31 in accordance with
the ETSI specification.
If logical C-channels are in use, each logical C-channel
is mapped to one and only one physical C-channel. This
restriction is mandated by the role of the protection
protocol. The protection protocol, which protects logical
C-channels, can only protect a single logical C-channel
per protection switch over. This implies an implicit
limitation of one logical C-channel per physical C-channel.
For a V5.2 interface, the physical C-channels are identified
by a logical link ID and a timeslot. Each V5.2 interface can
support a maximum of 48 physical C-channels (timeslots 16,
15, and 31 on up to 16 E1 links; 3 * 16 = 48).
Physical C-channels are not available for bearer connections.
The physical C-channels are identified at provisioning
time and when ISDN ports with D-channel signaling are
added."
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iso(1)
v52CChannelEntry(1) 
