Standard of Camera & Imaging Products Association

CIPA DCG-006-2012
Implementation Guidelines for DPS over IP(White paper)Prepared byStandardization Committee
Published byCamera & Imaging Products Association

Overview
This document specifies implementation guidelines for using the DPS standard in LAN environments,
through the use of CIPA DC-001 (Digital Photo Solutions for Imaging Devices) (hereinafter called“DPS standard”), typically called PictBridge, and CIPA DC-005 (“Picture Transfer Protocol” overTCP/IP networks (PTP-IP)) (hereinafter called “PTP-IP standard”), which are defined by CIPA.
Methods of verifying interconnectivity between DPS devices in wireless LAN environments andconformance specifications for use of logotypes will be separately defined.

Background and Overview
Background
The DPS standard is independent of the physical I/F. However, the only physical I/F specified in theimplementation guidelines is USB.
In 2005, CIPA established the PTP-IP standard for PTP (Picture Transfer Protocol) communication on TCP(Transfer Control Protocol), but did not specify implementation guidelines for DPS, assuming the PTP-IPstandard, thereby causing a problem in interconnectivity.

Overview
The objective of the present guidelines is to compile mutually-respected conventions into guidelines, forvarious settings that have not yet been determined in LAN I/F connection environments and unclear technicalitems for realizing DPS services using the PTP-IP standard.

Scope
The present guidelines define conventions for expansion to LAN connection environments, in addition to USB
supported as the sole physical I/F of the DPS standard.
The present guidelines apply to image input devices such as DSC and image output devices such as printers,
which are connected to each other in a LAN environment and have a direct print function.

iCommunication Protocol Architecture of DPS over IP
A Communication Protocol Architecture of LAN I/F-based DPS is described below in comparison with a USB
I/F-based Communication Protocol Architecture.

Communication Protocol Architecture of USB I/F-Based DPS
USB I/F-based DPS is described in detail in the DPS standard in CIPA.
USB I/F is characterized by the adoption of SICD (Still Image Capture Device) as a USB device class forconnecting PTP, an image transfer protocol.

Digital Camera

Printer

PictBridge(Client)

PictBridge(Server)DPS
PTP(Responder)
SICD(Responder)USB(Device)DPS
PTP(Initiator)
SICD(Initiator)
USB(Host)

USB Connection

Figure 4-1

2Communication Protocol Architecture of LAN I/F-Based DPS
Figure 4-2 is a Communication Protocol Architecture of LAN I/F-based DPS.
Wired LAN/wireless LAN shall be used as the physical I/F. The PTP-IP standard (CIPA DC-005-2005 “PictureTransfer Protocol over TCP/IP networks”) standardized by CIPA shall be adopted as the protocol for connecting
the above TCP/IP layer and PTP, an image transfer protocol, to each other using a TCP session.
In order to select a device to be connected in a PTP session from among devices in the network,
DPSPrinterDevice and DPSConnectionManagerService defined by CIPA on the basis of UPnP DA1.0 shall beadopted.

Printer

Digital Camera
PictBridge(Client)
DPS
PTP(Responder)
PTP-IP(Responder)

DPSPrinter

PictBridge(Server)

DPSConnectionManager

DPS
PTP(Initiator)
PTP-IP(Initiator)

Control Point
UPnP DASSDP

UPnP DA

SOAP

SSDP

httpSOAP
httpUDP/TCPIP
LAN/WLAN

UDP/TCPIP
LAN/WLANLAN Connection

Figure 4-23

Connection Topology in LAN Environments
The LAN connection topology in DPS over IP is specified as follows.

Physical Connection Topology
Figure 5-1 shows an example of a physical connection topology in DPS over IP.

DSC 1

Printer 1

Access Point / HUB

Printer n

DSC mFigure 5-1

As shown in the example of Figure 5-1, in the case of using LAN I/F, it shall be assumed, in a physicalconnection topology, that DSCs and PRTs are connected to each other and even a Multi Point-Multi Point
connection topology is configured.

4

Connection via 100BASE-TX of the IEEE802.3 standard shall be adopted as a physical I/F for using wired LANI/F; another connection may be adopted. Connection via an infrastructure mode of any IEEE802.11b/g/n (2.4GHz band) should be adopted as a physical I/F for using wireless LAN I/F; another connection may be adopted.

Logical Connection Topology
Figure 5-2 shows an example of a logical connection topology of DPS over IP.

DSC 1
PRT 1AP/HUBFigure 5-25

In order to implement DPS services between DSC1 and PRTn in a physical connection topology shown in theexample of Figure 5-1, a Point-Point logical communication path as shown in Figure 5-2 shall be configured for
DPS to establish a PTP-IP session.
The connection and termination of the PTP-IP session will be described in Section 10.

About Logo Certification

In order to improve the interconnectivity between DSC and PRT, Logo Certification Program is provided. The
PictBridge Logo certification certifies that products have passed the PictBridge Logo Certification
Test by executing the PictBridge Compliance Test Suite.
Please refer to the Logo Certification Guideline that describes the test method and the logo
application methods.

6