Specifications

Receptacles, Cables, and Pinouts

PA-H HSSI Port Adapter Installation and Configuration

1-8

HSSI Interface Cable

The HSSI cable (CAB-HSI1=) connects the PA-H with the external DSU. The HSSI cable is 10-feet

(3.048 meters) long. The maximum cable length is 50 feet (15.24 meters). Figure 1-11 shows the

HSSI cable. Table 1-2 lists the pinout.

Figure 1-11 HSSI Interface Cable Connector

Table 1-2 HSSI Interface Cable Pinout

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. 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 universal broadband routers, two Cisco 7100 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 1-12 shows the null modem cable. The null modem cable uses

Signal Name + Side Pin No. – Side Pin No.

Direction

Router DSU

1 Router is + side (DTE). DSU is – side (DCE).

SG (Signal Ground) 1 26 —

RT (Receive Timing) 2 27 <—

CA (DCE Available) 3 28 <—

RD (Receive Data reserved) 4 29 <—

LC (Loopback circuit C) 5 30 <—

ST (Send Timing) 6 31 <—

SG (Signal Ground) 7 32 —

TA (DTE Available) 8 33 —>

TT (Terminal Timing) 9 34 —>

LA (Loopback circuit A) 10 35 —>

SD (Send Data) 11 36 —>

LB (Loopback circuit B) 12 37 —>

SG (Signal Ground) 13 38 —

5 (Ancillary to DCE) 14–18 39–43 —>

SG (Signal Ground) 19 44 —

5 (Ancillary from DCE) 20–24 45–49 <—

SG (Signal Ground) 25 50 —

H5691