Specifications

Configuring and Managing Cisco Access Servers and Dial Shelves
Port Management Services on Cisco Access Servers
DC-125
Cisco IOS Dial Technologies Configuration Guide
The NextPort DFC performs the following functions:
• Converts pulse code modulation (PCM) bitstreams to digital packet data.
• Forwards converted and packetized data to the main processor, which examines the data and
forwards it to the backhaul egress interface.
• Supports all modem standards (such as V.34 and V.42bis) and features, including dial-in and
dial-out.
Port Management Services on the Cisco AS5800 Access Server
Port service management on the Cisco AS5800 access server implements service on the Universal Port
Card (UPC). A universal port carries a single channel at the speed of digital signal level 0 (DS0), or the
equivalent of 64-kbps on a T1 facility.
Network traffic can be a modem, voice, or fax connection. The 324 port UPC uses NextPort hardware
and firmware to provide universal ports for the Cisco AS5800 access server. These ports are grouped into
54 service processing elements (SPEs). Each SPE supports six universal ports. To find the total number
of ports supported by a UPC, multiply the 54 SPEs by the six ports supported on each SPE. The total
number of universal ports supported by a single UPC is 324. Configuration, management, and
troubleshooting of universal ports can be done at the UPC, SPE, and port level. Each UPC also has a
SDRAM card with a minimum of a 128 MB of memory.
The Cisco AS5800 access server can be equipped with a maximum of seven UPCs with upgradable
firmware. The UPC supports data traffic, and depending on the software and platform is universal port
capable. Each UPC plugs directly into the dial shelf backplane and does not need any external
connections. Each UPC has three LEDs, which indicate card status.
The Cisco AS5800 access server is capable of terminating up to 2,048 incoming modem connections
(slightly more than an OC3) when equipped with seven UPCs and three CT3 trunk cards. A split shelf
configuration with a second router shelf and second dial shelf controller are required to achieve full
capacity. A single router with a standard configuration supports up to 1,344 port connections.
Cisco IOS Release 12.1(3)T or higher is required for the UPC. Unless your system shipped with UPCs
installed, you must upgrade the Cisco IOS image on the dial shelf and router shelf or shelves.
Instead of the traditional line-modem one-to-one correspondence, lines are mapped to an SPE that
resides on the Cisco AS5800 access server UPC. Each SPE provides modem services for six ports.
Busyout and shutdown can be configured at the SPE or port level. The UPC introduces the shelf, slot,
and SPE software hierarchy. On the Cisco AS5800 access server, the hierarchy designation is
shelf/slot/SPE.
A UPC can be installed in slots numbered 2 to 11 on the dial shelf backplane. If installed in slots 0 or 1,
the UPC automatically powers down. Slots 0 and 1 only accept trunk cards; they do not accept mixes of
cards. We recommend that you install mixes of T3 and T1 cards, or E1 trunk cards in slots 2 to 5. You
can use double-density modem cards, UPCs, and VoIP cards simultaneously. Trunk cards can operate in
slots 0 to 5 and are required for call termination.
The UPC performs the following functions:
• Converts pulse code modulation (PCM) bitstreams to digital packet data.
• Forwards converted and packetized data to the dial shelf main processor, which examines the data
and forwards it to the router shelf. From the router shelf, the data is routed to the external network.