home *** CD-ROM | disk | FTP | other *** search
- From telecom@delta.eecs.nwu.edu Tue Mar 23 13:50:32 1993
- Received: from delta.eecs.nwu.edu by gaak.LCS.MIT.EDU via TCP with SMTP
- id AA20918; Tue, 23 Mar 93 13:50:26 EST
- Received: by delta.eecs.nwu.edu id AA09773
- (5.65c/IDA-1.4.4 for ptownson@gaak.lcs.mit.edu); Tue, 23 Mar 1993 12:50:21 -0600
- Date: Tue, 23 Mar 1993 12:50:21 -0600
- From: TELECOM Moderator <telecom@delta.eecs.nwu.edu>
- Message-Id: <199303231850.AA09773@delta.eecs.nwu.edu>
- To: ptownson@gaak.LCS.MIT.EDU
- Subject: tdd.specifications
- Status: RO
-
- >From CER2520@ritvax.isc.rit.edu Tue Mar 23 08:36:13 1993
- Received: from vaxc.isc.rit.edu by delta.eecs.nwu.edu with SMTP id AA12891
- (5.65c/IDA-1.4.4 for <telecom-request@eecs.nwu.edu>); Tue, 23 Mar 1993 12:37:07 -0600
- Received: from ritvax.isc.rit.edu by ritvax.isc.rit.edu (PMDF #2327 ) id
- <01GW5E1H4SLS9M0VBG@ritvax.isc.rit.edu>; Tue, 23 Mar 1993 13:36:13 EST
- Date: 23 Mar 1993 13:36:13 -0500 (EST)
- From: "Curtis E. Reid" <CER2520@ritvax.isc.rit.edu>
- Subject: Request to put in telecom-archives at lcs.mit.edu
- To: telecom-request@eecs.nwu.edu
- Message-Id: <01GW5E1H4SLU9M0VBG@ritvax.isc.rit.edu>
- X-Vms-To: IN%"telecom-request@eecs.nwu.edu"
- X-Vms-Cc: CER2520
- Mime-Version: 1.0
- Content-Transfer-Encoding: 7BIT
- Status: R
-
- PAT,
-
- Can you put the TDD specifications in the TELECOM-ARCHIVES at lcs.mit.edu?
- Maybe call it tdd.specs ? I get so many requests for the specifications that I
- think it might be justified by keeping a separate file that you and I can tell
- readers to pull this file out from the archives. What do you say? Thanks!
-
- --Curtis
- -----CUT HERE---------
- Specifications For TDD Data Transmit/Receive
-
- All TDD manufacturers follow these specs but no tolerance level is given:
-
- 1. Acoustic coupling (standard G- and K- type handset)
-
- Input level: 65 dB SPL minimum / 110 db SPL maximum
- -4 2
- (0 dB SPL = 2 x 10 dyne/cm )
-
- Output level: 95 dB SPL minimum / 100 dB SPL maximum
- (acoustic pressure to produce a -9 dBm
- signal at the telephone set line terminals
- on an average loop)
-
- 2. Direct modular connection
-
- Connector: standard 6-position modular jack
-
- USOC No.: RJ11C
-
- Input level: -50 dBm minimum / 0 dBm maximum
-
- Output level: -13 dBm minimum / -9 dBm maximum
-
- 3. Modem
-
- Modulation method: Frequency Shift Keying
-
- Mark frequency: 1400 Hz +-5 Hz
-
- Space frequency: 1800 Hz +-5 Hz
-
- Signal to noise ratio: 13 dB
-
- Carrier to data delay: 180 ms
-
- Carrier to hold time: 156 ms
-
- 4. Protocol
-
- Code: Baudot
-
- Mode: Half duplex
-
- Transmissions: Asynchronous
-
- Start bit: 1
-
- Stop bit: 1
-
- Data bits: 5
-
- Parity: None
-
- Data rate: 45.5 baud (buffered)
-
- Note: The above information is from Plantronics, Inc. (manufacturer of
- the Vu-Phone) and is assumed to be consistent with other brands as the
- Vu-Phone is compatible with all other TDD's.
- (1985)
- --------------
- Curtis E. Reid CER2520@ritvax.isc.rit.edu
- Rochester Institute of Technology/NTID REID@DECUS.org (DECUS)
- P.O. Box 9887 716.475.6089 TDD/TT 475.6895 Voice
- Rochester, NY 14623-0887 U.S.A. 716.475.6500 Fax (Business Use Only)
-
-
-
- From telecom@delta.eecs.nwu.edu Tue Mar 23 13:53:43 1993
- Received: from delta.eecs.nwu.edu by gaak.LCS.MIT.EDU via TCP with SMTP
- id AA21057; Tue, 23 Mar 93 13:53:40 EST
- Received: by delta.eecs.nwu.edu id AA07817
- (5.65c/IDA-1.4.4 for ptownson@gaak.lcs.mit.edu); Tue, 23 Mar 1993 12:53:35 -0600
- Date: Tue, 23 Mar 1993 12:53:35 -0600
- From: TELECOM Moderator <telecom@delta.eecs.nwu.edu>
- Message-Id: <199303231853.AA07817@delta.eecs.nwu.edu>
- To: ptownson@gaak.LCS.MIT.EDU
- Subject: tdd.specifications
- Status: RO
-
-
- From: "Curtis E. Reid" <CER2520@ritvax.isc.rit.edu>
- Subject: Request to put in telecom-archives at lcs.mit.edu
-
- PAT,
-
- Can you put the TDD specifications in the TELECOM-ARCHIVES at lcs.mit.edu?
- Maybe call it tdd.specs ? I get so many requests for the specifications that I
- think it might be justified by keeping a separate file that you and I can tell
- readers to pull this file out from the archives. What do you say? Thanks!
-
- --Curtis
- -----CUT HERE---------
- Specifications For TDD Data Transmit/Receive
-
- All TDD manufacturers follow these specs but no tolerance level is given:
-
- 1. Acoustic coupling (standard G- and K- type handset)
-
- Input level: 65 dB SPL minimum / 110 db SPL maximum
- -4 2
- (0 dB SPL = 2 x 10 dyne/cm )
-
- Output level: 95 dB SPL minimum / 100 dB SPL maximum
- (acoustic pressure to produce a -9 dBm
- signal at the telephone set line terminals
- on an average loop)
-
- 2. Direct modular connection
-
- Connector: standard 6-position modular jack
-
- USOC No.: RJ11C
-
- Input level: -50 dBm minimum / 0 dBm maximum
-
- Output level: -13 dBm minimum / -9 dBm maximum
-
- 3. Modem
-
- Modulation method: Frequency Shift Keying
-
- Mark frequency: 1400 Hz +-5 Hz
-
- Space frequency: 1800 Hz +-5 Hz
-
- Signal to noise ratio: 13 dB
-
- Carrier to data delay: 180 ms
-
- Carrier to hold time: 156 ms
-
- 4. Protocol
-
- Code: Baudot
-
- Mode: Half duplex
-
- Transmissions: Asynchronous
-
- Start bit: 1
-
- Stop bit: 1
-
- Data bits: 5
-
- Parity: None
-
- Data rate: 45.5 baud (buffered)
-
- Note: The above information is from Plantronics, Inc. (manufacturer of
- the Vu-Phone) and is assumed to be consistent with other brands as the
- Vu-Phone is compatible with all other TDD's.
- (1985)
- --------------
- Curtis E. Reid CER2520@ritvax.isc.rit.edu
- Rochester Institute of Technology/NTID REID@DECUS.org (DECUS)
- P.O. Box 9887 716.475.6089 TDD/TT 475.6895 Voice
- Rochester, NY 14623-0887 U.S.A. 716.475.6500 Fax (Business Use Only)
-
-
-
-