Cisco Cisco Unified Contact Center Enterprise 9.0(2)

The Peripheral Subsystem

A peripheral is a switch, such as an ACD, PBX, VRU, or Unified CM. Calls arrive at the
peripheral through trunks that are organized into trunk groups. The system software monitors
activity at each peripheral and can route calls to targets at each peripheral.

The logical interface controller and physical interface controller represent the Peripheral Gateway
(PG) through which the peripheral communicates with the system.

To view the elements in a peripheral subsystem, see the following figure.

Figure 27: Peripheral Subsystem

The routing client figures into this subsystem only if the peripheral acts as a routing client (that
is, it sends routing requests to the system software). For information on defining Routing Clients,
see the "

Peripheral Gateways (PGs)

Each peripheral communicates with the system software through a Peripheral Gateway, called
a PG. The PG is a computer that communicates directly with the ACD, PBX, VRU, or Unified
CM at a contact center, monitoring status information from the peripheral and sending it to the
Central Controller. If the peripheral acts as a routing client, the PG sends routing requests to
the system software.

The PG can be a single simplexed computer or a pair of duplexed computers. A single PG can
service more than one peripheral; however, each peripheral uses one, and only one, PG.

Note: Although a PG can consist of a pair of duplexed computers, only one of them is active
at a time, so that the system software sees it as a single, logical and physical, PG.

Configuration Guide for Cisco Unified ICM/Contact Center Enterprise and Hosted Release 8.0(2)