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7500 — Synchronous DCE
Data Terminal Equipment Requirements
The data terminal must accept timing (transmit signal element timing and receive signal element
timing) from the 7500.
Data Rates
The 7500 operates at synchronous half-duplex emulation at 1200 to 19200, and 56000 bps; and
synchronous full-duplex operation at 1200, 2400, 4800, 9600, 19200, 48000 or 64000 bps.
Synchronous Interface Information
When the Multipurpose Enhancement Board is installed, the 7500 provides a female 25-pin EIA-
232D DCE interface connector on port 1 for synchronous data communication and a female 25-pin RS-
366 ACU interface connector on port 2 for automatic calling. When the High Speed Synchronous
Enhancement Board is installed with its adapter cable connected to port 2, the 7500 provides a female
34-pin V.35 DCE interface for synchronous data communication. In this configuration, the 25-pin
female interface at port 1 is not functional. The synchronous interface pin assignments are listed in
table below.
Synchronous DCE Pin Assignments
Table Q:
V.35 PIN EIA-232D PIN
B
C
D
E
F
H
J
L
N
P
S
R
T
V
X
Y
AA
NN
MNEMONIC
SG
7
RTS
4
RFS
5
DSR
6
RLSD
8
DTR
20
RI
22
LL
18
RL
21
BA
2
BA
BB
3
BB
BD
17
BD
BC
15
BC
TM
25
CHAPTER 9: TECHNICAL INFORMATION
DESCRIPTION
Signal Ground
Request to Send
Ready for Sending
Data Set Ready
Received Line Signal Detect
Data Terminal Ready
Ring Indicator
Local Loopback
Remote Loopback
Transmitted Data-A Wire
Transmitted Data-B Wire
Received Data-A Wire
Received Data-B Wire
Receiver Signal Element Timing-A Wire
Receiver Signal Element Timing-B Wire
Transmitter Signal Element Timing-A Wire
Transmitter Signal Element Timing-B Wire
Test Mode
135
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