Cisco Cisco XR 12000 12000 1-Port OC-48c STM-16c POS SDH ISE Line Card
48
Packet-Over-SONET Line Card Installation and Configuration
78-16412-02
Cabling and Specifications
Step 2
Attach the line card cable-management bracket to the line card as follows:
a.
Position the cable-management bracket over the front of the line card faceplate.
b.
Insert and tighten the captive screw(s) to secure the bracket to the line card.
c.
Starting with the bottom port on the line card, connect each interface cable to the intended port.
Step 3
For multiport line card cable-management brackets, carefully wrap the cables with the supplied Velcro
strap. (See
strap. (See
Figure 39
.)
For single-port line card cable-management brackets, carefully press the interface cable onto the cable
clip. (See
clip. (See
Figure 40
.) Avoid any kinks or sharp bends in the cable.
For information on disconnecting and connecting interface cables, see the
.
Cabling and Specifications
The following sections provide informaton about specifications and cabling for POS line cards:
•
•
•
Packet-Over-SONET Interface
POS is a high-speed method of transporting Internet Protocol (IP) traffic between two points. This
technology combines the Point-to-Point Protocol (PPP) with Synchronous Optical Network (SONET)
and Synchronous Digital Hierarchy (SDH) interfaces.
technology combines the Point-to-Point Protocol (PPP) with Synchronous Optical Network (SONET)
and Synchronous Digital Hierarchy (SDH) interfaces.
PPP was designed as a standard method of communicating over point-to-point links. Initial deployment
was over short local lines, leased lines, and plain-old-telephone-service (POTS) (also called basic
telephone service) for users of modems. As new packet services and higher speed lines are introduced,
PPP can be deployed easily in these environments as well.
was over short local lines, leased lines, and plain-old-telephone-service (POTS) (also called basic
telephone service) for users of modems. As new packet services and higher speed lines are introduced,
PPP can be deployed easily in these environments as well.
SONET is an octet-synchronous multiplex scheme defined by the American National Standards Institute
(ANSI) standard (T1.1051988) for optical digital transmission at hierarchical rates from 51.840 Mbps
to 2.5 Gbps (Synchronous Transport Signal, STS-1 to STS-48) and greater. SDH is an equivalent
international standard for optical digital transmission at hierarchical rates from 155.520 Mbps (STM-1)
to 2.5 gigabits per second (Gbps) (STM-16) and greater. SONET electrical specifications have been
defined for single-mode fiber, multimode fiber, and CATV 75-ohm coaxial cable. (For example, the
4-port OC-3c/STM-1c POS line card allows transmission over single-mode and multimode optical fiber
at Optical Carrier 3 [OC-3] rates. OC-3 is the Optical Carrier 3 specification for SONET STS-3c and
SDH STM-1 transmission rates.)
(ANSI) standard (T1.1051988) for optical digital transmission at hierarchical rates from 51.840 Mbps
to 2.5 Gbps (Synchronous Transport Signal, STS-1 to STS-48) and greater. SDH is an equivalent
international standard for optical digital transmission at hierarchical rates from 155.520 Mbps (STM-1)
to 2.5 gigabits per second (Gbps) (STM-16) and greater. SONET electrical specifications have been
defined for single-mode fiber, multimode fiber, and CATV 75-ohm coaxial cable. (For example, the
4-port OC-3c/STM-1c POS line card allows transmission over single-mode and multimode optical fiber
at Optical Carrier 3 [OC-3] rates. OC-3 is the Optical Carrier 3 specification for SONET STS-3c and
SDH STM-1 transmission rates.)
SONET/SDH transmission rates are integral multiples of 51.840 Mbps. The following transmission
multiples are currently specified and commonly used:
multiples are currently specified and commonly used:
•
OC-3c/STM-1c—155.520 Mbps
•
OC-12c/STM-4c—622.080 Mbps