Specifications

T1 CSU/DSU
10
NOTE
When operating as a channel service unit (CSU), the setting of the Line Build Out function is
dictated by the carrier and must be set as the carrier specifies. Otherwise, the LBO Switch must
be set to zero (0) dB position.
2.8 CHANNEL INTERFACE CONNECTIONS
T1 CSU/DSU is configured for DTE connection with one of these three interfaces: V.35; RS-449; or RS-
530 (female connectors). Below are the pin-outs (male connectors) for these interfaces.
V.35 Pin Out (34-pin male connector)
PIN FUNCTION PIN FUNCTION
A . . . . . . . . . . . . . . . . . . . . . . .GROUND T . . . . . . . . . . . . . . . . . . . . . . .RD(B)
D . . . . . . . . . . . . . . . . . . . . . . . . .CTS U . . . . . . . . . . . . . . . . . . . . . . . .TT(A)
E . . . . . . . . . . . . . . . . . . . . . . . . .DSR V . . . . . . . . . . . . . . . . . . . . . . .RT(A)
F . . . . . . . . . . . . . . . . . . . . . . . . .DCD W . . . . . . . . . . . . . . . . . . . . . . .TT(B)
P . . . . . . . . . . . . . . . . . . . . . . . . .SD(A) X . . . . . . . . . . . . . . . . . . . . . . .RT(B)
R . . . . . . . . . . . . . . . . . . . . . . . .RD(A) Y . . . . . . . . . . . . . . . . . . . . . . . .ST(A)
S . . . . . . . . . . . . . . . . . . . . . . . . .SD(B) AA . . . . . . . . . . . . . . . . . . . . . . .ST(B)
RS-449 Pin Out (DB37 male connector)
1 ..........................................Shield
2 ..............................Signal Rate Indicator 20 . . . . . . . . . . . . . . . .Receive Common
3 ..............................................— 21 . . . . . . . . . . . . . . . . . . . . . . .—
4 ....................................Send Data (A) 22 . . . . . . . . . . . . . . . . . .Send Data (B)
5 ..................................Send Timing (A) 23 . . . . . . . . . . . . . . . . .Send Timing (B)
6 ..................................Receive Data (A) 24 . . . . . . . . . . . . . . . . .Receive Data (B)
7................................Request ToSend (A) 25 . . . . . . . . . . . . . . .Request to Send (B)
8 ................................Receive Timing (A) 26 . . . . . . . . . . . . . . . .Receive Timing (B)
9..................................Clear To Send (A) 27 . . . . . . . . . . . . . . . . .Clear to Send (B)
10 ..................................Local Loopback 28 . . . . . . . . . . . . . . . .Terminal in Service
11....................................Data Mode(A) 29 . . . . . . . . . . . . . . . . . . .Data Mode
12 ..............................Terminal Ready (A) 30 . . . . . . . . . . . . . . . .Terminal Ready (B)
13 ..............................Receiver Ready (A) 31 . . . . . . . . . . . . . . . .Receiver Ready (B)
14 ................................Remote Loopback 32 . . . . . . . . . . . . . . . . . .Select Standby
15 ....................................Incoming Call 33 . . . . . . . . . . . . . . . . . .Signal Quality
16 ................................Select Frequency 34 . . . . . . . . . . . . . . . . . . .New Signal
17 ..............................Terminal Timing (A) 35 . . . . . . . . . . . . . . . .Terminal Timing (B)
18 ......................................Test Mode 36 . . . . . . . . . . . . . . . . .Standby/Indicator
19....................................Signal Ground 37 . . . . . . . . . . . . . . . . . .Send Common
RS-530 Pin Out (DB25 male connector)
1 . . . . . . . . . . . . . . . . . . . . . . . .Shield (A) 14 ......................................Transmitted Data (B)
2 . . . . . . . . . . . . . . . . . . .Transmitted Data (A) 15 ..........................Transmitter Signal Element DCE (A)
3 . . . . . . . . . . . . . . . . . . . .Received Data (A) 16 ........................................Received Data (B)
4 . . . . . . . . . . . . . . . . . . . .Request to Send (A) 17 ......................Receiver Signal Element Timing DCE (A)
5 . . . . . . . . . . . . . . . . . . . . .Clear to Send (A) 18 ..........................................Local Loopback
6 . . . . . . . . . . . . . . . . . . . . . .DCE Ready (A) 19 ..........................................Request to Send
7 . . . . . . . . . . . . . . . . . . . . . .Signal Ground 20 ..........................................DTE Ready (A)
8 . . . . . . . . . . . . . .Received Line Signal Detector (A) 21 ........................................Remote Loopback
9 . . . . . . . . . . .Receiver Signal Element Timing–DCE (B) 22 ..........................................DCE Ready (B)
10 . . . . . . . . . . . . . .Received Line Signal Detector (B) 22 ..........................................DCE Ready (B)
11 . . . . . . . . . .Transmitter Signal Element Timing–DTE (B) 23 ..........................................DTE Ready (B)
12 . . . . . . . . .Transmitter Signal Element Timing–DCE (B) 24 ....................Transmitter Signal Element Timing DTE (A)
13 . . . . . . . . . . . . . . . . . . . .Clear to Send (B) 25 ..............................................Test Mode
2.8.1 POWER CONNECTION
The power connector (female) is on the rear panel. The male connector of the DC power supply plugs
into this female connector. Fig. 2-6 shows the pinout of the 5-pin DIN connecter.
2.8.2 NETWORK CONNECTION
The Network connector is an RJ48C modular connector with an RJ48C-to-DB15 pigtail cable (not
supplied). Refer to Figure 2-7.