Cisco Systems PA-2H manual Hssi Null Modem Cable, Null Modem Cable Connectors

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HSSI Null Modem Cable

HSSI Null Modem Cable

The null modem cable (CAB-HNUL=) can connect two routers directly back to back. The null modem cable is 10-feet (3.048 meters) long. Figure 1-6 shows the null modem cable. The maximum null modem cable length allowed is 50 feet (15.24 meters). The two routers must be in the same location and can be two Cisco 7000 series routers, two Cisco 7500 series routers, two Cisco 7200 series routers, two Cisco uBR7200 series routers, or any combination of each. A null modem connection allows you to verify the operation of the HSSI or to link the routers directly in order to build a larger node.

Figure 1-6 Null Modem Cable Connectors

H5692

The null modem cable uses the same 50-pin connectors as the HSSI cable, but uses the pinouts listed in Table 1-2. For connection and conﬁguration instructions, refer to Chapter 7, “Cable Installation and Interface Conﬁguration,” for information about attaching null modem cables.

Table 1-2	HSSI Null Modem Cable Pinouts

Signal Name		From Pins	Direction	To Pins	Signal Name

RT (Receive Timing)		2, 27	—>	9, 34	TT (Terminal Timing)

CA (DCE available)		3, 28	—>	8, 33	TA (DTE Available)

RD (Receive Data)		4, 29	—>	11, 36	SD (Send Data)

LC (Loopback C)		5, 30	—>	10, 35	LA (Loopback A)

ST (Send Timing)		6, 31	—>	6, 31	ST (Send Timing)

TA (DTE available)		8, 33	—>	3, 28	CA (DCE Available)

TT (Terminal Timing)		9, 34	—>	2, 27	RT (Receive Timing)

LA (Loopback A)		10, 35	—>	5, 30	LC (Loopback C)

SD (Send Data)		11, 36	—>	4, 29	RD (Receive Data)

GND (Ground)		1, 26,		1, 26,	GND (Ground)
		7, 32,		7, 32,
		13, 38,		13, 38,
		19, 44,		19, 44,
		25, 50		25, 50

Loopback (not		12, 37
connected)

				12, 37	Loopback (not connected)

Not used		14–18, 20–24,		14–18, 20–24, Not used
		39–43, 45–49		39–43, 45–49

Caution Although the HSSI connector and the HSSI cable are similar to SCSI-II format, they are not identical. The HSSI cable speciﬁcation is more restrictive than that for the SCSI-II. If a SCSI-II cable is used instead of an HSSI cable, proper operation cannot be guaranteed.

Overview 1-5

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Contents Corporate Headquarters Copyright 1996-1999, Cisco Systems, Inc All rights reserved Document Objectives About This ManualDocument Organization Cisco Connection Online Cisco Connection OnlineIf You Need More Information Documentation CD-ROMIf You Need More Information If You Need More Information If You Need More Information Port Adapter Overview Overview605559 LEDs Hssi Interface Cable Receptacles, Cables, and PinoutsHssi Null Modem Cable Null Modem Cable ConnectorsReceptacles, Cables, and Pinouts List of Parts and Tools Preparing for InstallationPlatform Minimum Cisco IOS Release Software and Hardware RequirementsSafety Warnings Safety GuidelinesSafety Guidelines Electrical Equipment Guidelines Telephone Wiring GuidelinesPreventing Electrostatic Discharge Damage FCC Class B Compliance VIP2 and the Dual-Port Hssi Port Adapter Installation OverviewVIP2-50 with Two Hssi Port Adapters in Port Adapter Slots 0 Location of Port Adapter Screw Partial Port Adapter View Removing a Port AdapterInstalling a New Port Adapter Installing a Port AdapterInstalling a Port Adapter Installation Overview Catalyst RSM/VIP2 and the Dual-Port Hssi Port Adapter Catalyst RSM/VIP2-40 with PA-2H in Port Adapter Slot Removing a Port Adapter Installing a Port Adapter Installing a New Port Adapter Installation Overview Cisco 7206 with an Hssi Port Adapter in Port Adapter Slot Cisco 7200 Series and the Dual-Port Hssi Port AdapterPort adapter Handle Lever unlocked Position Handling a Port Adapter Replacing a Port AdapterSlot Port adapter Installation Overview Cisco uBR7200 Series Dual-Port Hssi Port Adapter Port adapters Port adapters Port adapter lever in unlocked position Inside slot guide PC board Metal carrier Port adapter retention clip in locked position Installation Overview Attaching Hssi Port Adapter Interface Cables Cable Installation and Interface ConfigurationAttaching a Null Modem Cable Connecting Hssi Cables Front View-PA-2H Shown without HandleConﬁguring the Hssi Interfaces Cisco 7200 Series and Cisco uBR7200 Series Ports Cisco 7206 Hssi Port Number Example VIP2 Ports Conﬁguring InterfacesConfiguring Interfaces Checking the Conﬁguration Conﬁguring Cyclic Redundancy ChecksUsing show Commands to Verify the New Interface Status Cisco 7200 Series and Cisco uBR7200 Series show Commands Use the show diag command to display the hardware revision VIP2 show Commands FF FF FF FF FF FF FF FF Catalyst RSM/VIP2 show Commands Router# show version FF FF FF FF FF FF FF FF Router# ping Using the ping CommandConfiguring the Hssi Interfaces